Co-reporter:Tingjun Lu;Li Wang;Yufeng He;Jing Chen
RSC Advances (2011-Present) 2017 vol. 7(Issue 30) pp:18379-18383
Publication Date(Web):2017/03/24
DOI:10.1039/C7RA00610A
Loess clay (LC), a very abundant clay with granules and high hydrophilicity, was modified by surface grafting copolymerization of functional monomers, such as acrylamide (AM) and sodium p-styrene sulfonate (StS), and a cross-linking agent (N,N-methylenebisacrylamide: MBA), which afforded a LC surface grafting copolymer (LC-PAmS). Its structure and composition were characterized by Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM). Acting as a novel and low-cost Loess-based polymer adsorbent, its adsorption behaviors were investigated with removing basic fuchsin (BF) in aqueous solution. After optimizing conditions, the removal rate got to 98.4% in 40 min at room temperature. Its adsorption mechanism was also investigated. It was found that the adsorption isotherm model could meet the Freundlich isotherm requirements and the dynamics were consistent with a pseudo-second-order kinetic model. In summary, LC-PAmS is a kind of polymer adsorbent for practically applied in wastewater treatment.
Co-reporter:Qizhao Wang;Yanbiao Shi;Qiong Ma
Journal of Materials Science: Materials in Electronics 2017 Volume 28( Issue 2) pp:2123-2127
Publication Date(Web):05 October 2016
DOI:10.1007/s10854-016-5775-8
The Zn(II)5,10,15,20-tetrakis [m-methoxy-p-hydroxyl-phenyl] porphyrins (ZnTmMpHPP) as a photosensitizer was applied to modified TiO2 and the composite was prepared via a hydrothermal process. The as-obtained flower-like TiO2 and TiO2/ZnTmMpHPP composites were characterized by X-ray diffractometry, scanning electron microscopy, Fourier transform infared spectromotry, transient photocurrent responses and BET. Photocatalytic hydrogen production results show the TiO2/ZnTmMpHPP composite has a higher photocatalytic activity than pure TiO2 under ultraviolet light irradiation, which is due to the enhanced transfer and separation efficiency of photo-induced carriers from the ZnTmMpHPP to TiO2 with the help of conjugated π bond in ZnTmMpHPP. The recycled H2 evolution test indicates that the TiO2/ZnTmMpHPP composite is stable enough under the reaction system. In the presented paper, it is proven that the ZnTmMpHPP can greatly accelerate the separation of charges and effectively improve the photocatalytic H2 evolution activity of TiO2.
Co-reporter:Jianfeng Wang, Wenzhen Qian, Yufeng He, Yubing Xiong, Pengfei Song, Rong-Min Wang
Waste Management 2017 Volume 65(Volume 65) pp:
Publication Date(Web):1 July 2017
DOI:10.1016/j.wasman.2017.04.025
•The sources of discarded biomass and traditional treatment are summarized.•The main composition and polymer chains of discarded biomass material are described.•The novel approaches for reutilization of discarded biomass are discussed.•Functional polymer materials prepared by using discarded biomass are summarized.Biomass is abundant and recyclable on the earth, which has been assigned numerous roles to human beings. However, over the past decades, accompanying with the rapid expansion of man-made materials, such as alloy, plastic, synthetic rubber and fiber, a great number of natural materials had been neglected and abandoned, such as straw, which cause a waste of resource and environmental pollution. In this review, based on introducing sources of discarded biomass, the main composition and polymer chains in discarded biomass materials, the traditional treatment and novel approach for reutilization of discarded biomass were summarized. The discarded biomass mainly come from plant wastes generated in the process of agriculture and forestry production and manufacturing processes, animal wastes generated in the process of animal husbandry and fishery production as well as the residual wastes produced in the process of food processing and rural living garbage. Compared with the traditional treatment including burning, landfill, feeding and fertilizer, the novel approach for reutilization of discarded biomass principally allotted to energy, ecology and polymer materials. The prepared functional materials covered in composite materials, biopolymer based adsorbent and flocculant, carrier materials, energy materials, smart polymer materials for medical and other intelligent polymer materials, which can effectively serve the environmental management and human life, such as wastewater treatment, catalyst, new energy, tissue engineering, drug controlled release, and coating. To sum up, the renewable and biodegradable discarded biomass resources play a vital role in the sustainable development of human society, as well as will be put more emphases in the future.Based on discussing the main composition and polymer chains in discarded biomass, their reutilization approaches, from the perspective of polymer, especially to prepare functional polymer materials were summarized.Download high-res image (71KB)Download full-size image
Co-reporter:Qizhao Wang, Qiong Ma, Juhong Lian, Junbo Zhong, Fangping Wang, Jianzhang Li, Yufeng He and Rongmin Wang
New Journal of Chemistry 2016 vol. 40(Issue 6) pp:5604-5610
Publication Date(Web):26 Apr 2016
DOI:10.1039/C5NJ03061G
Bovine serum albumin (BSA), a non-toxic natural polymer material, is used as a template agent to modify the as-prepared photocatalyst ZnO, changing the ZnO nanorod into a nanosheet. The synthesized samples were characterized by scanning microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), Fourier transform infrared (FT-IR) spectroscopy, photoluminescence (PL) spectroscopy and the Brunauer–Emmett–Teller method (BET). The photocatalytic performance of the samples was evaluated via the photocatalytic degradation process of methylene blue (MB) and phenol under UV-light irradiation. Compared to pure ZnO, the ZnO/BSA composites exhibited superior photocatalytic activity, which could be attributed to the distensible surface area and the effective separation of photoinduced electron–hole pairs. Besides, the BSA used as a template could promote the photocatalysts to absorb more dye particles on its surface and improve degradation performance, which could be applied in a similar fashion between the protein and MB.
Co-reporter:GUIFANG YAN;YUFENG HE;GANG LI;YUBING XIONG;PENGFEI SONG
Journal of Chemical Sciences 2016 Volume 128( Issue 11) pp:1783-1788
Publication Date(Web):2016 November
DOI:10.1007/s12039-016-1184-z
Superoxide anion radical (O\(_{2}^{\bullet -}\)) is a noxious reactive oxygen species (ROS). Transition metal ion complexes have been generally used as antioxidants to eliminate ROS. In this work, a neoteric water-soluble biopolymer metal complex (BSA-M) was prepared by conjugating the soluble biopolymer bovine serum albumin (BSA) with three transition metal ions (M, M =Cu, Co, Mn). The binding mode and ratio of metal ions bound to albumin were investigated. The BSA-M complexes were characterized by UV-Vis, circular dichroism (CD) spectra and polyacrylamide gel electrophoresis (PAGE). BSA served as polymer scaffold and the metal complex functioned as the catalytic active center. The results demonstrated that the structure of BSA remained unchanged when the binding ratio of transition metal ion complex to BSA was 5:1. Furthermore, the scavenging superoxide anion free radical (O\(_{2}^{\bullet -}\)) activity of biopolymer-metal complexes were determined by nitroblue tetrazolium light reduction assay method. The antioxidant capacity of BSA-M has markedly increased. The conjugated BSA-M (M=Cu, Mn) showed preeminent scavenging activity for O\(_{2}^{\bullet -}\), and the EC50 value of the BSA-Cu was 0.038 ±0.0013 μmol⋅L−1, which is comparable to EC50 value (0.041±0.001 μmol⋅L−1) of the natural superoxide dismutase (SOD), the analog quantity reached 107%. As a consequence, it can be considered as a bio-functional mimic of enzyme SOD and has a promising application prospect in antioxidant drug field.
Co-reporter:Wenzhong Zhai, Bin Wang, Yusheng Wang, Yu-Feng He, Pengfei Song, Rong-Min Wang
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2016 Volume 503() pp:94-100
Publication Date(Web):20 August 2016
DOI:10.1016/j.colsurfa.2016.05.025
•A family of polymeric JPs with high yields was synthesized via EfEP.•Controllable morphology was achieved by simply adjusting amounts of monomers.•Amphiphilic and double-faced particles had self-assembly behavior.•Polymeric JPs possessed special Pickering emulsifiabilities.A family of polymeric Janus particles with submicron sizes of 450 ∼ 700 nm has been facilely synthesized via one-step and two-step one-pot emulsifier-free emulsion polymerization (EfEP), a typical simple, time-saving and efficient method for practical production of pure polymer microparticles. The spherical, spherical bulge-like, half-raspberry, half-cauliflower and multiple-bulge morphologies in their evolution from small to large bulges are achieved by simply adjusting the amounts of hydrophilic or hydrophobic monomers based on controllable phase separation of hydrophobic copolymer. Furthermore, these amphiphilic and double-faced particles with different surface properties possess special Pickering emulsifiabilities. For example, with controlling circumstance from acidic to alkali solutions, they start from stabilizing O/W emulsion for spherical bulge-like Janus particles, phase inversion of emulsions, to W/O emulsion for multiple-bulge Janus particles. The key characteristics are without complex preparation process from masking step or multi-step polymerization, also significant strategy for preparation of structural and functional polymer microparticles, such as controllable morphologies and emulsifiabilities.
Co-reporter:Wenzhong Zhai, Zhan-Min Wu, Xiaowen Wang, Pengfei Song, Yufeng He, Rong-Min Wang
Progress in Organic Coatings 2015 Volume 87() pp:122-128
Publication Date(Web):October 2015
DOI:10.1016/j.porgcoat.2015.05.019
•Preparation of antibacterial PkE@NT particles via Pickering emulsion polymerization.•The PkE@NT emulsion had excellent antibacterial activity.•The PkE@NT emulsion is a promising candidate for functional coatings.Using nano-TiO2 as stabilizer, a novel waterborne antibacterial Pickering emulsion containing epoxy-acrylate copolymer@nano-TiO2 composite particles (PkE@NT) has been successfully prepared via emulsion polymerization. The core–shell composite nanoparticles were characterized by dynamic light scattering (DLS), scanning electron microscope (SEM) and transmission electron microscopy (TEM), whose components were also confirmed by FT-IR and TGA. The mechanism of PkE@NT was suggested by monitoring the particle size changes in time. The average particle size was approximately 180 nm. Furthermore, water absorption of PkE@NT film got to 142 wt%, which showed good water absorption. The basic properties and antibacterial property of PkE@NT emulsion for interior coatings were also investigated. It showed that the emulsion had excellent adhesive force and antibacterial activity.
Co-reporter:Wenzhong Zhai, Tao Li, Yu-Feng He, Yubing Xiong and Rong-Min Wang
RSC Advances 2015 vol. 5(Issue 93) pp:76211-76215
Publication Date(Web):03 Sep 2015
DOI:10.1039/C5RA12434D
A facile synthesis strategy for generating two types of highly uniform amphiphilic polymer Janus particles, spherical seeds and half-cauliflower particles, is first presented. Both of the submicron particles possessing pH-switchable emulsifiabilities can change their amphiphilicities/shapes and induce phase inversion of emulsions in response to pH values of solution.
Co-reporter:Juhua Guo;Sujuan Pan;Xiaochun Yin;Yu-Feng He;Tao Li
Journal of Applied Polymer Science 2015 Volume 132( Issue 9) pp:
Publication Date(Web):
DOI:10.1002/app.41572
ABSTRACT
Using feather keratin as biocompatible and inexpensive natural biopolymer and methacrylic acid as a functional monomer, we prepared a pH-sensitive feather-keratin-based polymer hydrogel (FKPGel) with grafted copolymerization. The obtained FKPGel was characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. The swelling behavior and pH sensitivity of the FKPGel were investigated. When the small molecule (rhodamine B) and macromolecule (bovine serum albumin) were used as model drug molecules, the FKPGel exhibited controllable release behavior in vitro, and the hydrogels had pH sensitivity. For a small molecular drug, the cumulative release rate was 97% in 24 h at pH 8.4. For macromolecular drug, the cumulative release rate reached 89% at pH 7.4. Its release behavior could be controlled by the pH value. In summary, a simple method was found to reuse disused feathers. It is a kind of pH-sensitive hydrogels to be applied in drug-delivery systems. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41572.
Co-reporter:Sujuan Pan;Xiaochun Yin;Yu-Feng He
Arabian Journal for Science and Engineering 2015 Volume 40( Issue 10) pp:2853-2859
Publication Date(Web):2015 October
DOI:10.1007/s13369-015-1676-z
In this study, a novel keratin-based polymer hydrogel (K-PmaH) was successfully prepared by graft-copolymerization of methacrylic acid onto keratin, cross-linked with N,N’-methylene-bis-acrylamide, then blended with agar. The influence of reaction temperature, dosage of reductant, initiator, and monomers on graft-copolymerization and that of heating methods on blending process was investigated. The results demonstrated that the dosage of DTT has prominent effects on the graft-copolymerization, and microwave radiation has significant effects on hydrogel properties. The swelling properties and in vitro degradation characteristic of K-PmaH also have been investigated, respectively. Determination results indicate that the K-PmaH has moderate swelling capacity in water and swelling–shrinkage behavior in saline solution. Moreover, K-PmaH reveals an excellent degradable characteristic in pepsin solution and trypsin solution. Consequently, the hydrogel K-PmaH is expected to be applied to the wounds and burns covering materials or bandages.
Co-reporter:Zhili Xu;Sujuan Pan;Gang Li;Yu-Feng He
Journal of Inorganic and Organometallic Polymers and Materials 2015 Volume 25( Issue 6) pp:1313-1319
Publication Date(Web):2015 November
DOI:10.1007/s10904-015-0242-1
Superoxide anion radical (O2•−) is a toxic reactive oxygen species (ROS). Schiff-base metal complexes have been widely studied as synthetic antioxidants to scavenge ROS. However, it is toxic and shows poor water solubility. In this work, a kind of novel water-soluble biopolymer/metal complex conjugate (HO-SAM@BSA) was prepared by binding the 4-hydroxy-salicylaldehyde amino acid Schiff-base metal complexes (HO-SAM, M = Cu, Zn, Co) with water-soluble biopolymer bovine serum albumin (BSA). The conjugates were characterized using IR, UV–Vis, circular dichroism spectra (CD), and polyacrylamide gel electrophoresis (PAGE). The results show that the structure of BSA is maintained when the binding rate (nHO-SAM: nBSA) of amino acid Schiff-base metal complexes is 10. In addition, the O2•− scavenging activities of resultant conjugates were determined via nitrobule tetrazolium assay method. After combining HO-SAM into BSA, the poor water-solubility of HO-SAM is improved, and the O2•− scavenging activity of BSA increases dramatically. The conjugation HO-SCCu@BSA displays excellent O2•− scavenging activity. When the EC50 value was 0.10 μmol/L, the analog quantity reached 41 % of natural SOD. Therefore, it can act as a bifunctional mimic of enzyme, which has a great application prospect in antioxidant drug.
Co-reporter:Zhan-Min Wu, Wen-Zhong Zhai, Yu-Feng He, Peng-Fei Song, Rong-Min Wang
Progress in Organic Coatings 2014 Volume 77(Issue 11) pp:1841-1847
Publication Date(Web):November 2014
DOI:10.1016/j.porgcoat.2014.06.006
•Silicylacrylate copolymer core–shell emulsion particles were prepared.•Improving the water and stain resistance of coatings.•The formation mechanism of core–shell structure was given.•The humidity controlling coatings show excellent humidity-sensitive property.Using silicylacrylate (SPMA: 3-(trimethoxysilyl)propyl methacrylate) and acrylic acid as functional monomers, silicylacrylate copolymer core–shell emulsion (SiA-CSE) was prepared by emulsion polymerization. The relationships between stability of SiA-CSE and contents of SPMA, emulsifier, initiator and copolymerization temperature were investigated. Moreover, the structure of SiA-CSE was characterized by FTIR, TEM and TGA techniques. The SiA-CSE was applied to prepare the silicylacrylate copolymer humidity coatings (SiA-CSE-C) by compositing with pigments and porous fillers. Based on measuring the basic performance of copolymer emulsion film and SiA-CSE coatings, the humidifying function of SiA-CSE coatings was investigated. In conclusion, SPMA could improve the adhesion of SiA-CSE film and water resistance of the coatings. The obtained coatings showed excellent humidity-sensitivity and humidity retention, which could be used as the interior walls coatings in the building.
Co-reporter:Zhan-Min Wu;Wen-Zhong Zhai;Yu-Feng He
Arabian Journal for Science and Engineering 2014 Volume 39( Issue 9) pp:6693-6701
Publication Date(Web):2014 September
DOI:10.1007/s13369-014-1190-8
A novel waterborne ambient self-crosslinkable emulsifier-free core–shell polyacrylate emulsion (EC-PAE) has been successfully prepared by emulsifier-free seeded emulsion polymerization. Some key factors in polymerization were investigated systematically. The core–shell particles morphology, distribution and compositions have been measured by transmission electron microscopy, dynamic light scattering and FT-IR spectra, respectively. During preparation of film or coatings, the polyacrylate emulsion (EC-PAE) could cure fast at ambient temperatures due to the cross-linking reaction between keto-carbonyl in diacetone acrylamide and adipic acid dihydrazide (ADH). Furthermore, EC-PAE has been applied to a new kind of two-component air-dried waterborne coatings with addition of ADH, which afforded the ambient-temperature curable waterborne coatings (EC-PAE-C). The basic properties of the novel waterborne coatings meet the national standard of architectural indoor coatings, especially in hardness, gloss, viscosity and water resistance. It is also found that the coatings exhibit a large capacity for water absorption (260 %), increasing indoor humidity and dehumidification in dry or moist environments.
Co-reporter:Shao-Fei Zhang;Fa-Rui Liu;Yu-Feng He
Arabian Journal for Science and Engineering 2014 Volume 39( Issue 1) pp:23-30
Publication Date(Web):2014 January
DOI:10.1007/s13369-013-0838-0
Methyl methacrylate, butyl acrylate, acrylic acid and diacetone acrylamide were used as main monomers to prepare polyacrylic ester emulsion (PA). Isophorone diisocyanate, polypropylene glycol and 2,2-dimethylolpropionic acid were used as main monomers to prepare waterborne polyurethane emulsion (PU). Then, a new kind of waterborne polyurethane–polyacrylic ester hybrid emulsion (PUPA) was prepared successfully by physical blend of PA and PU. The structure and chemical components of the waterborne polyurethane–polyacrylic ester hybrid nanoparticles were investigated by transmission electron microscopy, FT–IR spectra and thermogravimetric analysis, respectively. The film properties of PUPA were measured and showed excellent hardness, gloss, water resistance and water absorption. The humidity-sensitive coating (PUPA-C) was prepared from PUPA, pigments and fillers. The basic properties of humidity-controlling coating were investigated, with particular attention to the effects of humidity-controlling. The humidity-controlling coating showed excellent properties of humidity sensitivity and humidity retention.
Co-reporter:Xiao-Chun Yin, Fang-Ying Li, Yu-Feng He, Yan Wang and Rong-Min Wang
Biomaterials Science 2013 vol. 1(Issue 5) pp:528-536
Publication Date(Web):26 Feb 2013
DOI:10.1039/C3BM00158J
We report the fabrication of keratin films with porosity using keratin, for controlled drug delivery systems. Feathers are currently an important waste product from the poultry industry, however abandoned down products cause an environmentally difficult disposal problem as they are not efficiently extracted and applied. In this paper, feather keratin was extracted using a high-efficiency method. The yield of pure keratin was up to 90%. Its molecular weight was 20 kDa with low dispersity. The films, based on the extracted keratin, were prepared using a simple method, and showed good mechanical properties. Furthermore, the feather keratin films were used to load and release drugs. The resultant feather keratin biopolymer films were pH-responsive and showed controllable drug-release behavior. In summary, we achieved a simple method to reutilize disused feathers. It could be an attractive candidate for applications in the biomedical field.
Co-reporter:Shao-Fei Zhang, Rong-Min Wang, Yu-Feng He, Peng-Fei Song, Zhan-Min Wu
Progress in Organic Coatings 2013 Volume 76(Issue 4) pp:729-735
Publication Date(Web):April 2013
DOI:10.1016/j.porgcoat.2013.01.003
A novel crosslinked core–shell emulsion of waterborne polyurethane-acrylic copolymers (PUA) was successfully synthesized by emulsion polymerization. The average particle size of the PUA particle was approximately 130 nm and its core–shell morphology was proved with transmission electron microscopy (TEM) and dynamic light scattering (DLS), whose structure was also confirmed by FT-IR and TGA. PUA was applied to prepare the humidity controlling coatings (PUA-C) by compositing with pigments and porous fillers. The structure and properties of humidity controlling coatings were investigated, with particular attention to the effects of the humidity controlling. The surface morphology of the PUA-C was observed by scanning electron microscope (SEM). The humidity controlling coatings showed excellent properties of humidity sensitivity and humidity retention.Highlights► A novel waterborne polyurethane-acrylic crosslinked core–shell particle was prepared. ► The formation mechanism of crosslinked core–shell structure was given. ► The scrub resistance of the coatings could be up to 1250 times. ► The humidity controlling coatings showed excellent humidity-sensitive property.
Co-reporter:Shao-Fei Zhang;Yu-Feng He;Zhan-Min Wu
Iranian Polymer Journal 2013 Volume 22( Issue 6) pp:447-456
Publication Date(Web):2013 June
DOI:10.1007/s13726-013-0144-4
Indoor humidity has an important influence on our lives. Too high relative humidity (RH > 60 %) can cause the metal surface corrosion, electrical insulation fall, material deformation and so on. On the contrary, when the moisture content is too low (RH < 40 %), it causes skin chapping, decrease in respiratory system resistance, static electricity, etc. The humidity controlling coating is a kind of composite that controls the humidity of materials. In this study, the emulsifier-free acrylate copolymer emulsion (EF-AAC) containing ketocarbonyl and carboxyl groups was synthesized and the humidity controlling coating (EF-AAC-C) was prepared by EF-AAC, adipic dihydrazide (ADH) and porous fillers. The different proportions and the contents of KPS, NaHCO3, and the effects of polymerization time and reaction temperature on the stability of emulsion were investigated. The different ratios of fillers/emulsion and ADH/diacetone acrylamide for water resistance of coatings were also studied. Moreover, the structure of emulsifier-free acrylate copolymer was characterized by FTIR and TGA techniques. The particle morphologies were measured by transmission electron microscopy and dynamic light scattering. It showed that the distribution of emulsion particle size was narrow and uniform. The properties of humidity controlling coatings were studied with particular attention to the effects of the humidity controlling. Meanwhile, the water absorption of humidity controlling coatings was up to 260 %. The humidity controlling coatings revealed excellent properties of humidity sensitivity and humidity retention because of the composite porous structure due to fillers with emulsifier-free acrylate copolymer. The mechanism of breathing water molecules in obtained coatings was suggested and the composite could be widely used as indoor coatings for controlling humidity.
Co-reporter:Gang Li;HuiFang Zhang;RongMin Wang;YuFeng He;YuBing Xiong
Science Bulletin 2013 Volume 58( Issue 24) pp:2956-2963
Publication Date(Web):2013 August
DOI:10.1007/s11434-013-5787-1
A kind of novel biopolymer antioxidant (BSA/HOSalenM, M=Co, Mn, Zn) is prepared with conjugation, which increases the antioxidant activity of the bovine serum albumin (BSA). The conjugations have been characterized by IR spectra, UV-Vis spectra, Fluorescence spectra, Circular dichroism (CD) spectra and Native-PAGE. The BSA is used as a biopolymer scaffold, and the insoluble Salen Schiff-base metal complexes HOSalenM make axial coordination with the amino acid residues of the BSA. The structure of the BSA is unchanged when the binding rate of HOSalenCo is less than 10. The HOSalenCo conjugations show an excellent hydroxyl radical (·OH) scavenging activity, and the activity (EC50) of BSA/HOSalenCo(10) (BSA:HOSalenCo=1:10) is improved by two orders of magnitude compared with the BSA, while the activity of the BSA/HOSalenMn is weak and the BSA/HOSalenZn shows no scavenging activity.
Co-reporter:NaiPu He;RongMin Wang;YuFeng He;XiMei Dang
Science China Chemistry 2012 Volume 55( Issue 9) pp:1788-1795
Publication Date(Web):2012 September
DOI:10.1007/s11426-012-4604-z
Protein-polymer hybrids consisting of protein and natural polymers or synthetic polymers exhibit superior properties to unmodified proteins, generating a high demand for these materials in the fields of medicine, biotechnology, and nanotechnology. Herein, protein-polysaccharide hybrids were fabricated via the formation of an amide bond between bovine serum albumin (BSA) and chitosan (CS) using N-ethyl-N-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC) as the couple reagent. FTIR spectrum reveals that the carboxyl group of BSA conjugated with the amino group of chitosan backbone. The molecular weight of BSA-CS hybrids was identified by matrix-associated laser desorption ionization time of flight mass spectra (MALDI-TOF MS) and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). The maximum number of chitosan chains binding to each BSA molecule was estimated as 6, and the optimal number was estimated as 2. In addition, the secondary structure and surface property of BSA were dependent upon the number of polymer conjugating on protein. The secondary structure of BSA was not significantly changed, if a few chitosans were coupled with BSA. By further increasing the molar ratio of chitosan to BSA, the secondary structure of BSA was markedly damaged. The surface’s negative charges of modified BSA also decreased. The result of native polyacrylamide gel electrophoresis (native-PAGE) also demonstrated the changes in surface charges and molecular weight of BSA-CS hybrids.
Co-reporter:Rong-Min Wang, Jun-Feng Wang, Xiao-Wen Wang, Yu-Feng He, Yong-Feng Zhu, Meng-Lan Jiang
Progress in Organic Coatings 2011 Volume 71(Issue 4) pp:369-375
Publication Date(Web):August 2011
DOI:10.1016/j.porgcoat.2011.04.007
In order to investigate the humidity controlling mechanism of an acrylate-based copolymer emulsion (ACE), the storage stable copolymer of a novel waterborne two-pack system was prepared by emulsion polymerization using main monomers and functional monomers, such as acrylic acid (AA) and diacetone acrylamide (DAAM). Influencing factors such as those affecting the coagulum and particle size of the emulsion were investigated. The obtained ACE was characterized by FT-IR spectra and dynamic light scattering (DLS) analysis, and was applied to the preparation of wall coatings with humidity controlling functions, and showed a large capacity for water absorption (274%), increasing indoor humidity and dehumidification in dry or moist environments. Based on analysis of the micro-structure of the coatings and their humidity controlling properties, a humidity controlling mechanism was suggested. The coating properties of the ACE and its film were measured, and showed excellent hardness, gloss and water resistance properties. ACE coatings (ACE-C) exhibited humidity control and excellent moisture retention due to the porous structure of the filler combined with the acrylate-based copolymer.Highlights► A novel acrylate-based copolymer containing keto-carbonyl, amide and carboxyl groups was prepared by emulsion polymerization. ► The obtained copolymer emulsion was applied to prepare interior wall coatings with humidity controlling functions, which could increase indoor humidity or dehumidify in dry or moist environments. ► Based on analysis of the micro-structure of the coatings and their humidity controlling properties, a humidity controlling mechanism was suggested.
Co-reporter:Rongmin Wang;Junfeng Wang;Weihua Lv;Junfeng Guo;Yufeng He ;Menglan Jiang
Journal of Applied Polymer Science 2011 Volume 120( Issue 5) pp:3109-3117
Publication Date(Web):
DOI:10.1002/app.33473
Abstract
A new kind of water-dispersed resin, amphiphilic acrylic acid copolymer resin was prepared by hydrophilic monomer, hydrophobic monomer, and functional monomer (diacetone acrylamide). The effect of acid value and diacetone acrylamide concentration on water solubility was investigated. It showed that the acid value should be greater than 100 mg KOH/g. The coating properties of the amphiphilic acrylic acid copolymer resin and its film were measured, which showed excellent properties in hardness, gloss, and water resistance. It was applied to prepare the humidity-sensitive coatings. The water absorption of humidity-sensitive coatings was 260%. It could increase indoor humidity or dehumidify in dry or moist environment. On the basis of scanning electron microscopy images, the mechanism of humidity-sensitive activity was also discussed. The humidity-sensitive exhibited humidity sensitivity and excellent humidity retention because fillers of porous structure combined with amphiphilic copolymer. It could be widely applied in indoor coating for controlling humidity. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Co-reporter:Yubing Xiong, Hong Wang, Rongmin Wang, Yunfeng Yan, Bo Zheng and Yunpu Wang
Chemical Communications 2010 vol. 46(Issue 19) pp:3399-3401
Publication Date(Web):07 Apr 2010
DOI:10.1039/B926901K
A very convenient one-step synthesis to cross-linked polymeric nanoparticles by conventional radical copolymerization without the addition of stabilizers or surfactants was explored. Moreover, these nanoparticles exhibited excellent stability, activity and selectivity in the cycloaddition reaction of CO2 to epoxides and could be separated from the products easily and reused.
Co-reporter:Rong-Min Wang;Wei-Hua Lv;Yu-Feng He;Yan Wang ;Jun-Feng Guo
Polymers for Advanced Technologies 2010 Volume 21( Issue 2) pp:128-134
Publication Date(Web):
DOI:10.1002/pat.1407
Abstract
An emulsifier-free core–shell polyacrylate emulsion, containing nano-SiO2 nanoparticles in the core and diacetone acrylamide (DAAM) in the shell, has been successfully prepared by emulsifier-free seeded emulsion polymerization. The effects of reaction temperature, dropping time, nano-SiO2 and initiator contents, and variation of the composition of core monomers on the amount of coagulum, particle size, and monomer conversion have been investigated. The particle morphology and the distribution of emulsion particles have been measured by transmission electron microscopy (TEM) and dynamic light scattering. The keto-carbonyl groups on the surface of the polyacrylate emulsion nanoparticles reacted with adipic dihydrazide (ADH) to form a film with a cross-linked network structure at room temperature. Therefore, the emulsifier-free core–shell emulsion could be used as a two-component room temperature curable waterborne coating. It was also found that the properties of the coating were clearly superior after using the cross-linker. Copyright © 2009 John Wiley & Sons, Ltd.
Co-reporter:Rong-Min Wang;Bo-Yun Wang;Yu-Feng He;Wei-Hua Lv ;Jun-Feng Wang
Polymers for Advanced Technologies 2010 Volume 21( Issue 5) pp:331-336
Publication Date(Web):
DOI:10.1002/pat.1432
Abstract
Composite nano-TiO2 with doping Fe3+ and Ag was prepared, and further modified by 3-methacryloxypropyltrimethoxysilane. They were characterized by Zetasizer Nano ZS Particle and Zeta Potential Analyzer, X-ray diffraction, UV–Vis spectrophotometer, FT–IR spectra, and transmission electron microscopy. The modified composite nano-TiO2 was applied to prepare multifunctional fluorocarbon coatings (FCC). Antibacterial activity of multifunctional FCC containing modified composite nano-TiO2 was investigated. Its photocatalytic antibacterial activity reached 92%. The influence of doping ingredients, amount of composite nano-TiO2, different light houses, or surface modification was discussed. The surface of FCC cannot be easily smirched by oiliness, dust or water because of hydrophobic fluorosilicone emulsion. It would be an available modern interior building coating for its remarkable photocatalytic antibacterial property as well as self-cleaning function. Copyright © 2009 John Wiley & Sons, Ltd.
Co-reporter:Rong-Min Wang;Gang Li;Hui-Fang Zhang;Yu-Feng He;Nai-Pu He ;Ziqiang Lei
Polymers for Advanced Technologies 2010 Volume 21( Issue 10) pp:685-690
Publication Date(Web):
DOI:10.1002/pat.1481
Abstract
New kinds of narrowly distributed protein-based nanoparticles, bovine serum albumin-Poly (acrylic acid) (BSA/PAA) nanospheres, and nanocapsules were prepared via in situ polymerization, swelling, and re-aggregation. The structure and morphology of the nanospheres were characterized by UV-Vis, FT-IR, DLS, and TEM. The stability of the BSA/PAA nanospheres and nanocapsules was increased when their skeletons were fixed by cross-linked agents. The nanospheres carried a positive charge and their size was about 80–110 nm. The protein-based nanocapsules were stimuli-responsive with pH value and their hydrodynamic diameter varied from 70 to 230 nm with changes of pH. In vitro release experiments of Rhodamine B and Doxorubicin hydrochloride showed that these biopolymer nanoparticles provided a controlled release of the entrapped drugs for 300 hr. Copyright © 2009 John Wiley & Sons, Ltd.
Co-reporter:Rong-Min Wang;Nai-Pu He;Peng-Fei Song;Yu-Feng He;Lan Ding;Zi-Qiang Lei
Polymers for Advanced Technologies 2009 Volume 20( Issue 12) pp:959-964
Publication Date(Web):
DOI:10.1002/pat.1348
Abstract
A new kind of nano-chitosan Schiff-base Cu complexes with particle sizes of 350 nm were prepared by combination of nano-chitosan, Cu and Schiff-base, and characterized by FT-IR spectra, TEM, DLS and elemental analysis. The modes and mechanism of interaction of the copper complexes with DNA were studied by the fluorescent probe method and electrophoresis analysis. The results suggest that the Cu complexes bound to DNA by electrostatic and intercalation modes. The anticancer activity of the Cu complexes was evaluated by Sulforhodamine B (SRB) assay in vitro. Nano-chitosan and their Schiff-base Cu complexes inhibited the growth of the liver cancer cell lines SMMC-7721 in vitro. The inhibition rate of Schiff-base Cu complexes was higher than that of nano-chitosan. Nano-chitosan combining with Schiff-base and Cu improved their anticancer activity, which ascribed to the synergistic effect between the chitosan matrix and the planar construction of the Cu complexes. Copyright © 2008 John Wiley & Sons, Ltd.
Co-reporter:Rong-Min Wang;Er-Xia Hao;Guo-Rui Shen;Yu-Feng He ;Zi-Qiang Lei
Journal of Applied Polymer Science 2009 Volume 111( Issue 4) pp:1999-2005
Publication Date(Web):
DOI:10.1002/app.29277
Abstract
The polymeric Salphen Schiff base-phthalocyanine Co-Cu dinuclear metal complex (PSalphenCo-PcCu) was designed and synthesized through interfacial condensation polymerization. The new sheet polymeric dinuclear metal complex has been characterized by IR spectra, UV-visible spectra, scanning electron microscopy with energy dispersive X-ray analysis and thermogravimetry analysis. Its catalytic activity for activation of molecular oxygen was investigated by using cumene as substrate without any additive in mild condition. The aerobic oxidation of cumene catalyzed by PSalphenCo-PcCu proved to be a simple and efficient method for obtaining cumene hydroperoxide in a high selectivity. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Co-reporter:Yun-Tao Xie;Yun-Pu Wang;Eishun Tsuchida;Nai-Pu He;Yu-Feng He
Polymers for Advanced Technologies 2005 Volume 16(Issue 8) pp:638-641
Publication Date(Web):24 JUN 2005
DOI:10.1002/pat.627
Water-soluble low molecular weight chitosan of nanometer level and its copper complexes were prepared, and characterized by IR spectra, elemental analysis and gel permeation chromatography (GPC). The modes and mechanism of these copper complexes interaction with DNA were studied by a fluorescent probe method and electrophoresis analysis. It is suggested that there are electrostatic and intercalation modes of copper complexes interacting with DNA. At first, the cationic complex electrostaticly binds to the negatively charged phosphate backbone of DNA, and then a portion of the complex intercalates between the base pairs on the DNA duplex strand. Copyright © 2005 John Wiley & Sons, Ltd.
Co-reporter:Rong-Min Wang;Xin Xie;Jin-Qing Wang;Su-Juan Pan;Yun-Pu Wang;Chun-Gu Xia
Polymers for Advanced Technologies 2004 Volume 15(Issue 1‐2) pp:52-54
Publication Date(Web):10 FEB 2004
DOI:10.1002/pat.450
Chitosan has been modified by polyacrylate sodium or acrylate sodium in the presence of glutaraldehyde, which afforded four kinds of modified chitosan (CTS-PA) with different ratios of reacting substance. They are used as an environmentally benign polymer adsorbent. The adsorption properties of these CTS-PA to Pb2+ have been measured. The best adsorption to Pb2+ was CTS-PA4, the removal efficiency was higher in higher concentration solution than in a lower one, the value of the removal efficiency is approximate 99.991%. Copyright © 2004 John Wiley & Sons, Ltd.
Co-reporter:Rong-Min Wang;Zhen-Lin Zhang;Jian-Fang Lou;Yun-Pu Wang;Peng-Fei Song;Chun-Gu Xia
Polymers for Advanced Technologies 2004 Volume 15(Issue 1‐2) pp:48-51
Publication Date(Web):10 FEB 2004
DOI:10.1002/pat.445
An inorganic polymer supporter, such as molecular sieve MCM-41, was used as a support for encapsulating metal complex catalysts. The metal complex was prepared with L-glutamic acid and Co(OAc)2 · 4H2O. Their catalytic activity in oxidation of cyclohexene with H2O2 was studied. The major products of this reaction were hexanedial, 2-cyclohexen-1-one, 2-cyclohexen-1-hydropenoxide and epoxide, which is different from typical oxidation of cyclohexene. The effect of temperature, solvent, additive, the amount of catalyst and oxidant were also discussed. The catalyst shows high catalytic activity. Copyright © 2004 John Wiley & Sons, Ltd.
Co-reporter:Yun-Pu Wang;Na-Li Chen;Yu-Bing Xiong;Rui-Tao Zha
Polymers for Advanced Technologies 2004 Volume 15(Issue 1‐2) pp:81-83
Publication Date(Web):10 FEB 2004
DOI:10.1002/pat.449
A living azospirillum simplex cell (LASSC) was immobilized on poly(sodium acrylate) (PSA). The method of preparation of the immobilized-cell (LASSC-PSA) was studied. LASSC was immobilized on PSA in an immobilizing medium of Na2HPO4 · 12H2O-NaH2PO4 · 2H2O (pH 7.0) buffer, sterile water, a solution of NaCl (0.85% m/m), cultured medium (pH 7.0), respectively. The desorption capacity of LASSC on LASSC-PSA in sterile water was measured and when the Na2HPO4 · 12H2O-NaH2PO4 · 2H2O (pH 7.0) buffer served as the immobilizing medium, the desorption capacity of LASSC on LASSC-PSA was the highest. The rate (m/m) of PSA and LASSC (wet weight) also affected considerably the desorption capacity of LASSC on LASSC-PSA in sterile water, and the best rate was 1 : 0.5. The desorption capacity of LASSC on LASSC-PSA was 50% of that at the beginning and that was still 109 cfu/g on storage for 5 months when the rate (m/m) of PSA and LASSC (wet weight) was 1 : 0.5, using Na2HPO4 · 12H2O-NaH2PO4 · 2H2O (pH 7.0) buffer as immobilizing medium. Copyright © 2004 John Wiley & Sons, Ltd.
Co-reporter:Yu-Feng He, Rong-Min Wang, Yun-Pu Wang, Chun-Gu Xia
European Polymer Journal 2002 Volume 38(Issue 10) pp:2129-2132
Publication Date(Web):October 2002
DOI:10.1016/S0014-3057(02)00100-3
The polymeric meso-tetra-(1,5-naphthalene bisulfonyloxo)phenylporphyrin and its complexes (PTNBSOPPM, M=Co, Mn, Fe) have been prepared in the presence of phase-transfer catalyst. Catalyzed by polymeric porphyrin complexes (PTNBSOPPM), styrene can be aerobic oxidized. The main products come from cleavage of double bond is in catalytic oxidation of styrene or α-methyl styrene.
Co-reporter:Rong-Min Wang;Cheng-Jun Hao;Yu-Feng He;Yun-Pu Wang;Chun-Gu Xia
Polymers for Advanced Technologies 2002 Volume 13(Issue 1) pp:6-10
Publication Date(Web):31 DEC 2001
DOI:10.1002/pat.99
The polymer bound Schiff-base ligand (PS-SalGlu) has been prepared from polystyrene bound salicylaldehyde and glutamic acid, and its complex (PS-SalGlu-Co) has also been synthesized. The polymer ligand and its complex were characterized by infrared spectroscopy, small area X-ray photoelectron spectroscopy, and inductively coupled plasma-atomic emission spectro (ICP-AFS). In the presence of the complex, cyclohexene can be effectively oxidized by molecular oxygen without reductant. The long-chain linear aliphatic olefins, such as 1-octene, 1-decene, 1-dodecene and 1-tetradecene, can be directly oxidized by molecular oxygen catalyzed by PS-SalGlu-Co, which affords the 1,2-epoxy alkane. Copyright © 2001 John Wiley & Sons, Ltd.
Co-reporter:Yu-Feng He, Rong-Min Wang, Yu-Yang Liu, Yue Chang, Yun-Pu Wang, Chun-Gu Xia, Ji-Shuan Suo
Journal of Molecular Catalysis A: Chemical 2000 Volume 159(Issue 1) pp:109-113
Publication Date(Web):22 September 2000
DOI:10.1016/S1381-1169(00)00178-3
Based on the gas chromatography (GC) and gas chromatography mass spectrometry (GC-MS) spectra, the analysis of the products of the catalytic oxidation and its mechanism can be elucidated. Here, the analysis of the aerobic oxidation products of cumene catalyzed by the polymer ferric complex through GC-MS has been performed. The main products are 2-phenyl-2-propanol (PP), 2-phenyl-2-iso-propyl hydroperoxide. From the analysis, the radical reaction mechanism was presumed. The relationship between the selectivity of cumene hydroperoxide and PP has been studied.
Co-reporter:Hui-Xia Feng, Rong-Min Wang, Yu-Feng He, Zi-Qiang Lei, Yun-Pu Wang, Chun-Gu Xia, Ji-Shuan Suo
Journal of Molecular Catalysis A: Chemical 2000 Volume 159(Issue 1) pp:25-29
Publication Date(Web):22 September 2000
DOI:10.1016/S1381-1169(00)00166-7
A series of porous silica support metal Schiff-base complexes was synthesized with amino porous silica, salicylaldehyde and metal ion, which characterized by IR spectra, elemental analysis, and SEM. The catalytic property for oxidation of olefins in the presence of molecular oxygen has been investigated. The major product of the aerobic oxidation without reductant was the epoxy. The influence of reaction temperature and additive for epoxidation had been studied. The selectivity and the conversion of epoxidation varied with reaction time, different additives and different catalysts.
Co-reporter:Yubing Xiong, Hong Wang, Rongmin Wang, Yunfeng Yan, Bo Zheng and Yunpu Wang
Chemical Communications 2010 - vol. 46(Issue 19) pp:NaN3401-3401
Publication Date(Web):2010/04/07
DOI:10.1039/B926901K
A very convenient one-step synthesis to cross-linked polymeric nanoparticles by conventional radical copolymerization without the addition of stabilizers or surfactants was explored. Moreover, these nanoparticles exhibited excellent stability, activity and selectivity in the cycloaddition reaction of CO2 to epoxides and could be separated from the products easily and reused.
Co-reporter:Xiao-Chun Yin, Fang-Ying Li, Yu-Feng He, Yan Wang and Rong-Min Wang
Biomaterials Science (2013-Present) 2013 - vol. 1(Issue 5) pp:NaN536-536
Publication Date(Web):2013/02/26
DOI:10.1039/C3BM00158J
We report the fabrication of keratin films with porosity using keratin, for controlled drug delivery systems. Feathers are currently an important waste product from the poultry industry, however abandoned down products cause an environmentally difficult disposal problem as they are not efficiently extracted and applied. In this paper, feather keratin was extracted using a high-efficiency method. The yield of pure keratin was up to 90%. Its molecular weight was 20 kDa with low dispersity. The films, based on the extracted keratin, were prepared using a simple method, and showed good mechanical properties. Furthermore, the feather keratin films were used to load and release drugs. The resultant feather keratin biopolymer films were pH-responsive and showed controllable drug-release behavior. In summary, we achieved a simple method to reutilize disused feathers. It could be an attractive candidate for applications in the biomedical field.
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![Phosphonium, [(4-ethenylphenyl)methyl]triphenyl-, chloride](http://img.cochemist.com/ccimg/47600/47562-35-6_b.png)
