Co-reporter:Zain-ul-Abdin, Li Wang, Haojie Yu, Muhammad Saleem, Muhammad Akram, Hamad Khalid, Nasir M. Abbasi, Xianpeng Yang
Journal of Colloid and Interface Science 2017 Volume 487() pp:38-51
Publication Date(Web):1 February 2017
DOI:10.1016/j.jcis.2016.10.001
Ferrocene-based derivatives are widely used as ferrocene-based burning rate catalysts (BRCs) for ammonium perchlorate (AP)-based propellant. However, in long storage, small ferrocene-based derivatives migrate to the surface of the propellant, which results in changes in the designed burning parameters and finally causes unstable combustion. To retard the migration of ferrocene-based BRCs in the propellant and to increase the combustion of the solid propellant, zero to third generation ethylene diamine-based ferrocene terminated dendrimers (0G, 1G, 2G and 3G) were synthesized. The synthesis of these dendrimers was confirmed by 1H NMR and FT-IR spectroscopy. The electrochemical behavior of 0G, 1G, 2G and 3G was investigated by cyclic voltammetry (CV) and the burning rate catalytic activity of 0G, 1G, 2G and 3G on thermal disintegration of AP was examined by thermogravimetry (TG) and differential thermogravimetry (DTG) techniques. Anti-migration studies show that 1G, 2G and 3G exhibit improved anti-migration behavior in the AP-based propellant.
Co-reporter:Jialiang Wu, Li Wang, Haojie Yu, Zain-ul-Abdin, Rizwan Ullah Khan, Muhammad Haroon
Journal of Organometallic Chemistry 2017 Volume 828() pp:38-51
Publication Date(Web):1 January 2017
DOI:10.1016/j.jorganchem.2016.10.041
•Research progress on Fc based RRGs are reviewed.•Various structures of Fc based RRGs and their synthesis are presented.•The properties and applications of Fc based RRGs are discussed.Redox-responsive gels (RRGs) change their properties in response to redox stimuli and have attracted considerable attention in recent years. RRG composed of high molecular weight polymers or low molecular weight gelators are extensively investigated for different applications, in which polymer gels are characterized as better performance in mechanical strength, various responsive behaviors and wide range of applications. Ferrocene is one of the most widely used redox center and plays a key role in the fabrication of RRGs. This review provides a brief description of design and applications of ferrocene-based redox-responsive polymer gels. Various responsive behavior and applications of ferrocene-based redox-responsive polymer gels are fully discussed.
Co-reporter:Muhammad Saleem;Li Wang;Zain-ul-Abdin
Colloid and Polymer Science 2017 Volume 295( Issue 6) pp:995-1006
Publication Date(Web):22 April 2017
DOI:10.1007/s00396-017-4049-1
Amphiphilic block copolymer PMAEFc-b-PMVAPBA was synthesized by reversible addition–fragmentation chain transfer (RAFT) polymerization. The hydrophobic and hydrophilic blocks of copolymers self-assembled into spherical micelles in aqueous solution. The redox behaviour of ferrocene was studied by using water-soluble (NH4)2Ce(NO3)6 and NaHSO3 as the oxidizing agent and reducing agent, respectively. The change in polarity and swelling of micelles increased the hydrodynamic diameter due to the oxidation of ferrocene, while glucose binding with boronic acid hydroxyls leads to unimers or smaller aggregates. TEM and DLS were used to investigate the redox-controlled behaviour of micelles. This redox-responsive behaviour would provide a prerequisite for detection/binding of biological analytes study and redox-controlled release of drug.
Co-reporter:Zheng Deng, Li Wang, Haojie Yu
European Polymer Journal 2017 Volume 93(Volume 93) pp:
Publication Date(Web):1 August 2017
DOI:10.1016/j.eurpolymj.2017.06.025
•Hyperbranched polyethylene-based copolymer was employed to prepare honeycomb film for the first time.•A systematic research was conducted to optimize the condition of preparing well-defined honeycomb films.•The micro-structure of honeycomb film was effectively controlled by adjusting solution concentration and relative humidity.Branched polymers were considered as one of the ideal materials to prepare patterned honeycomb film because of their strong ability to stabilize water droplets. In this work, we reported the first example of preparing patterned honeycomb films via breath figure method using hyperbranched polyethylene-based copolymer (HBPE-g-PtBMA). A systematic research was conducted to study the effect of solution concentration, relative humidity and substrate on the micro-structure of HBPE-g-PtBMA honeycomb film. It was found that the pore diameter (varied from 1.25 to 2.18 μm) and pore height (varied from 61 to 820 nm) could be controlled by adjusting solution concentration and relative humidity respectively. Besides, we verified that substrate with lower heat conductivity contributed to the formation of more regular honeycomb films. This work paved the way of fabricating patterned honeycomb films employing other hyperbranched polyethylene-based polymers and pointed to a new direction for the development of next-generation honeycomb patterned materials.Hyperbranched polyethylene-based copolymer was employed to fabricate honeycomb-patterned film for the first time. Regular hexagonal pore arrays with controlled pore width and height could be obtained by controlling polymer concentration, relative humidity and substrate.Download high-res image (108KB)Download full-size image
Co-reporter:Raja Summe Ullah;Li Wang;Nasir M. Abbasi;Muhammad Akram;Zain -ul-Abdin;Muhammad Saleem;Muhammad Haroon;Rizwan Ullah Khan
RSC Advances (2011-Present) 2017 vol. 7(Issue 38) pp:23363-23391
Publication Date(Web):2017/04/27
DOI:10.1039/C6RA27103K
Polyphosphazenes (PPZs) are hybrid polymers comprising a main chain containing nitrogen and phosphorous linked through interchanging single and double bonds, and side chains. The two chlorine atoms attached to the phosphorous of polydichlorophosphazene, which is produced by thermal ring-opening and living-cationic polymerization, are significant in the importance of polyphosphazene, as they can be easily replaced by an uncountable number of nucleophiles, resulting in hundreds of different PPZs with different properties ranging from hydrophobic to hydrophilic, fast to slow degradation, and burst to sustained drug release. More than seven hundred types of PPZs are synthesized as a result of different combinations of side groups. For applications in drug delivery, PPZs can be treated in various ways and converted into different vehicles of nano/micro size to load and release drugs. This review covers the synthesis of PPZs and their different modifications, especially focusing on the side groups and different vehicles, including microspheres, micelles, films and hydrogels, that are involved in drug-delivery applications.
Co-reporter:Qing Chen, Haojie Yu, Li Wang, Zain-ul Abdin, Xinpeng Yang, Junhua Wang, Weidong Zhou, Hongtao Zhang, Xiao Chen
Carbohydrate Polymers 2016 Volume 153() pp:429-434
Publication Date(Web):20 November 2016
DOI:10.1016/j.carbpol.2016.07.120
•Amylose grafted poly(acrylic acid) was synthesized.•Amylose grafted poly(acrylic acid) was used to adsorb ammonia.•Amylose grafted poly(acrylic acid) has promising application in ammonia adsorption in cigarette.Amylose grafted poly(acrylic acid) (Am-g-PAA) was synthesized by graft copolymerization of amylose with acrylic acid. The structure of Am-g-PAA was confirmed by 1H NMR and FT-IR spectra. The morphology, crystallinity and thermal properties of amylose and Am-g-PAA were investigated by SEM, XRD and TGA, respectively. The highest degree of substitution (DS) of carboxyl group was 1.96 which was obtained after reacted for 1 h at 60 °C. Acrylic acid to anhydroglucose mole ratio for DS was 19.81. It was found that a large number of carboxyl groups were grafted on the backbone of amylose. It was also found that ammonia adsorption capacity of amylose increased by grafting poly(acrylic acid) on the backbone of amylose.
Co-reporter:Muhammad Haroon, Li Wang, Haojie Yu, Nasir M. Abbasi, Zain-ul-Abdin, Muhammad Saleem, Rizwan Ullah Khan, Raja Summe Ullah, Qing Chen and Jialiang Wu
RSC Advances 2016 vol. 6(Issue 82) pp:78264-78285
Publication Date(Web):12 Aug 2016
DOI:10.1039/C6RA16795K
Starch is a biopolymer of plant origin which is cheap abundant and has many applications in food and non-food industries. However, in the native form, its applications are limited due to shortcomings, such as loss of viscosity and thickening power upon cooking and storage, retrogradation characteristics and absence of certain groups responsible for a particular function, etc. So, in order to reduce its limitations and improve its applications, modification of starch is necessary. It can be modified by several ways like chemical modification, physical modification and genetic modification but the most important one is the chemical modification. In this review, we selected the published data related to the chemical modification like grafting, cross-linking, esterification, etherification and dual modification of starch and application of modified starch for the adsorption of organic dyes and heavy metals from water.
Co-reporter:Muhammad Saleem, Haojie Yu, Li Wang, Zain-ul-Abdin, Hamad Khalid, Muhammad Akram, Nasir M. Abbasi, Yongsheng Chen
Journal of Electroanalytical Chemistry 2016 Volume 763() pp:71-78
Publication Date(Web):15 February 2016
DOI:10.1016/j.jelechem.2015.12.028
In this article ferrocene monoamino phenyl boronic acid (FcMAPBA) and ferrocene diamino phenyl boronic acid (FcDAPBA) were synthesized and characterized by 1H NMR and FTIR. Particular emphasis is given to cis-diol and saccharide binding affinities with ferrocene amino phenyl boronic acid (FcAPBAs) which was investigated by 1H NMR and CV (using sorbitol). Free and bound forms of derivatives were depicted from disappearance of boronic acid hydroxyls signal in 1H NMR spectra. The presence of two discrete peaks in the CV curves is in agreement with 1H NMR spectra, as the indication of cis-diol binding with saccharides. It was also proposed that this approach using potential shift difference in CV curves can be applied for surface confined glycated molecules detection.
Co-reporter:Zheng Deng, Li Wang, Haojie Yu, Xiaoting Zhai, Yongsheng Chen, Zain-ul-Abdin and Nasir M. Abbasi
RSC Advances 2016 vol. 6(Issue 35) pp:29663-29668
Publication Date(Web):11 Mar 2016
DOI:10.1039/C6RA01182A
Ferrocenyl hyper-branched polyethylene (HBPE-g-PFcEMA) was synthesized by chain-walking polymerization followed by atom transfer radical polymerization, and then characterized by 1H NMR and GPC. HBPE-g-PFcEMA was subsequently employed to disperse multi-walled carbon nanotubes (MWCNTs) in CHCl3. It was found that the MWCNTs were efficiently dispersed by HBPE-g-PFcEMA at a concentration of 150.4 mg L−1. The dispersibility of the MWCNTs in the presence of HBPE-g-PFcEMA was evaluated by TEM and SEM. The π–π stacking interactions between the MWCNTs and HBPE-g-PFcEMA were confirmed by UV-vis spectroscopy. Fabrication of the flexible conductive film by spin-coating the MWCNTs/HBPE-g-PFcEMA dispersion on a PET substrate was explored. The resultant conductive film showed good conductivity (conductivity = 943.4 S cm−1). Furthermore, its good conductivity was retained even after being twisted or bent. Thus, the conductive film might find its potential application in flexible electronics.
Co-reporter:Zheng Deng, Li Wang, Haojie Yu, Xiaoting Zhai and Yongsheng Chen
RSC Advances 2016 vol. 6(Issue 33) pp:27682-27689
Publication Date(Web):10 Mar 2016
DOI:10.1039/C5RA27379J
Carbon nanotubes (CNTs) have great potential applications in biomedical materials. However, the poor solubility of CNTs in water hinders their practical applications. Thus, an amphiphilic hyperbranched polyethylene-g-poly(methacrylic acid) (HBPE-g-PMAA) was synthesized to improve the solubility of multi-walled carbon nanotubes (MWCNTs) in water. The HBPE segment provided the CH–π interactions between HBPE and MWCNTs, while the PMAA segment gave the de-bundled MWCNTs good solubility and stability. In this way, the bundled MWCNTs were found to be dispersed efficiently into individual nanotubes by the HBPE-g-PMAA. The dispersing efficiency of MWCNTs was evaluated by TGA, TEM, SEM and AFM. The maximum concentration of MWCNTs was found to be 135 mg L−1. Hence, the HBPE-g-PMAA was an efficient amphiphilic polymer-based dispersant for dispersion of MWCNTs in water, and might find potential application in biomedical systems and devices.
Co-reporter:Weidong Zhou, Li Wang, Haojie Yu, Zain-ul-Abdin, Xianpeng Yang, Qing Chen and Junhua Wang
RSC Advances 2016 vol. 6(Issue 59) pp:53679-53687
Publication Date(Web):27 May 2016
DOI:10.1039/C6RA07616E
3-(Ferrocenylcarbonyl)propionic acid diglycidyl ester (FCPADE) was synthesized by Friedel–Craft acylation of ferrocene with succinic anhydride followed by reaction with epichlorohydrin. The synthesis of FCPADE was confirmed by 1H-NMR, 13C-NMR, MS and FT-IR. The electrochemical behavior and catalytic performance on decomposition of ammonium perchlorate (AP) were investigated. The results showed that FCPADE has a good catalytic effect on lowering the thermal decomposition temperature of AP. Anti-migration studies showed that FCPADE has a better anti-migration performance than ferrocene and catocene.
Co-reporter:Zheng Deng, Li Wang, Haojie Yu, Xiaoting Zhai and Yongsheng Chen
RSC Advances 2016 vol. 6(Issue 78) pp:74209-74214
Publication Date(Web):29 Jul 2016
DOI:10.1039/C6RA14757G
Carbon nanotubes (CNTs) have been extensively utilized in flexible electronics. However, further applications of CNTs are limited by their poor solubility in solvents. To overcome this obstacle, poly(tert-butyl methacrylate) modified hyperbranched polyethylene (HBPE-g-PtBMA) was employed. The HBPE core was designed to endow HBPE-g-PtBMA with a hyperbranched structure while the methyl groups of poly(tert-butyl methacrylate) provide CH–π interactions between HBPE-g-PtBMA and CNTs. Besides, the relative high melting endotherm of PtBMA segments enabled HBPE-g-PtBMA with feasibility to fabricate practical HBPE-g-PtBMA/MWCNTs conductive films. The bundled MWCNTs were found to be dispersed efficiently by HBPE-g-PtBMA into individual tubes with a maximum concentration of 455 mg L−1. Furthermore, fabrication of a conductive film by spin-coating the stable MWCNTs dispersion onto the PET substrate was explored. The conductive film was found to have good conductivity (13.14 S cm−1) and flexibility, which might have potential applications in flexible electronics.
Co-reporter:Zain-ul-Abdin, Li Wang, Haojie Yu, Muhammad Saleem, Muhammad Akram, Nasir M. Abbasi, Hamad Khalid, Ruoli Sun and Yongsheng Chen
New Journal of Chemistry 2016 vol. 40(Issue 4) pp:3155-3163
Publication Date(Web):29 Jan 2016
DOI:10.1039/C5NJ03171K
Ferrocene-based polymers and their derivatives have the ability to catalyze the burning process of composite solid propellants efficiently. However, the simple and volatile ferrocene migrates to the surface of the solid propellant on prolonged storage, which alters the designed burning parameters and more seriously causes unexpected explosions. To retard migration problems, six novel ferrocene-based polyethyleneimines (PEI-Fcs) were synthesized by the condensation reaction of branched polyethyleneimine (PEI) with ferrocenecarbonyl chloride. The structures of the synthesized PEI-Fcs were characterized using 1H NMR, FT-IR and UV-Vis spectroscopy. The redox properties of the polymers are very important for burning rate catalysts (BRCs). Cyclic voltammetry (CV) revealed that all the PEI-Fcs showed redox properties due to the presence of ferrocene moieties. Migration studies confirmed that the migration of these PEI-Fcs was much slower than that of 2,2-bis(ethylferrocenyl)propane (catocene) and ferrocene. The catalytic effect of PEI-Fcs on the thermal decomposition of ammonium perchlorate (AP) was investigated using thermogravimetry (TG) and differential thermogravimetry (DTG). It was found that in the presence of PEI-Fcs (1–6), the peak decomposition temperature of AP was shifted towards the left (decreased) significantly. The results from the TG and DTG analysis indicated that the novel PEI-Fcs had good catalytic effects of lowering the thermal decomposition temperature of AP and were almost stable up to 220 °C. We expect that these novel PEI-Fcs would have great value as high BRCs for composite solid propellants.
Co-reporter:Xiaoting Zhai;Li Wang;Zheng Deng;Zain-ul Abdin;Rongbai Tong;Xianpeng Yang;Yongsheng Chen ;Muhammad Saleem
Applied Organometallic Chemistry 2016 Volume 30( Issue 2) pp:62-72
Publication Date(Web):
DOI:10.1002/aoc.3369
Aromatic azobenzene derivatives are outstanding organic photochromic compounds that possess unique photochemical properties. These compounds are widely used in research and development for various applications, especially in information storage, owing to their ability to isomerize between cis (Z) and trans (E) forms under the influence of light of different wavelengths. On account of these advantages, many efforts have been made to generalize the use of azobenzene derivatives. Furthermore, ferrocene-based polymers and derivatives are promising candidates for functional materials due to their unique redox properties. By interlinking ferrocene with azobenzene, novel functional materials can be obtained that will integrate the excellent properties of both and will provide new applications in various fields including information storage, ion recognition, molecular devices, etc. This article provides an overview of the synthesis, properties and applications of novel ferrocene-based polymers and derivatives containing azobenzene units. Copyright © 2015 John Wiley & Sons, Ltd.
Co-reporter:Zheng Deng, Haojie Yu, Li Wang, Xiaoting Zhai, Yongsheng Chen, Sergey Z. Vatsadze
Journal of Organometallic Chemistry 2016 Volume 821() pp:48-53
Publication Date(Web):15 October 2016
DOI:10.1016/j.jorganchem.2016.03.016
•Ferrocene-containing nanomaterials were prepared via self-assembly method.•Nanostructures such as sheet, hollow and patchy sphere were prepared.•The morphology of nanostructures could be controlled by adjusting the concentration.Self-assembly of ferrocene-containing copolymers has been proved to be a convenient way to construct various functional nanomaterials. Thus, (hyperbranched polyethylene)-grafted-(poly(2-(methacryloyloxy)-ethyl ferrocenecarboxylate)) (HBPE-g-PFcEMA) was synthesized. It's self-assembly properties in the THF/n-hexane solvent mixture and n-hexane were explored. In the THF/n-hexane solvent mixture, spherical micelles were obtained at low concentration of HBPE-g-PFcEMA. However, at higher concentration, only irregular nanoparticles were observed. In contrast, the HBPE-g-PFcEMA micelles prepared in n-hexane by solvent diffusion method were with well-defined structures whether at low or high concentration of HBPE-g-PFcEMA. Furthermore, the nanostructures of these assemblies in n-hexane could be controlled to be sheet, hollow or patchy sphere simply by adjusting the concentration of HBPE-g-PFcEMA. Therefore, a novel and convenient way was provided to construct ferrocene-containing nanomaterials with various nanostructures from the same ferrocenyl hyperbranched copolymer by controlling its concentration. These ferrocene-containing nanomaterials might find their application as precursor in preparing functional iron oxide nanomaterials.Ferrocenyl hyperbranched polyethylene (HBPE-g-PFcEMA) was synthesized to construct various ferrocene-containing nanostructures via self-assembly method in n-hexane. As the concentration of HBPE-g-PFcEMA was increased from 0.1 to 10.0 mg/mL, individual micelle, micellar sheet, hollow sphere and patchy sphere were obtained, which might be utilized as precursor in preparing iron oxide nanomaterials.
Co-reporter:Muhammad Akram, Haojie Yu, Li Wang, Hamad Khalid, Nasir M. Abbasi, Zain-ul-Abdin, Yongsheng Chen, Fujie Ren, Muhammad Saleem
Materials Science and Engineering: C 2016 Volume 58() pp:169-179
Publication Date(Web):1 January 2016
DOI:10.1016/j.msec.2015.08.010
•We report biocompatible and mechanically stable microspheres based on PPHOSs/PMMA for hydrophilic drug release application.•The microspheres showed porosity, which was increased with drug release and degradation time.•The microspheres meet the basic requirement of in vivo drug release application for skeleton diseases.Drug delivery system is referred as an approach to deliver the therapeutic agents to the target site safely in order to achieve the maximum therapeutic effects. In this perspective, synthesis of three new polyphosphazenes and their blend fabrication system with poly(methyl methacrylate) is described and characterized with 1H NMR, 31P NMR, GPC and DSC. Furthermore, these novel blends were used to fabricate microspheres and evaluated for sustain release of hydrophilic drug (aspirin as model drug). Microspheres of the two blends showed excellent encapsulation efficacy (about 93%), controlled burst release (2.3% to 7.93%) and exhibited sustain in vitro drug release (13.44% to 32.77%) up to 218 h. At physiological conditions, the surface degradation of microspheres and diffusion process controlled the drug release sustainability. Furthermore, it was found that the degree of porosity was increased with degradation and the resulting porous network was responsible for water retention inside the microspheres. The percentage water retention was found to be interrelated with degradation time and percentage drug release.
Co-reporter:Xiao-ting Zhai;Hao-jie Yu;Li Wang;Zheng Deng
Journal of Zhejiang University-SCIENCE A 2016 Volume 17( Issue 2) pp:144-154
Publication Date(Web):2016 February
DOI:10.1631/jzus.A1500183
A series of ferrocene- and azobenzene-based compounds with acyl amine groups attached were designed and synthesized to explore their potential application in anion recognition. Their electro- and photo-properties, and the effect of nitro and amine substituents of the benzene ring on anion recognition were studied by UV-vis absorption spectroscopy (UV) and cyclic voltammetry (CV). The results showed that a nitro group substituent has a positive effect on the binding affinity and sensitivity, which might be due to the strong hydrogen bonding interaction between the receptor and the guest, while an amino group substituent has a negative effect on the sensitivity. Furthermore, the shift in the UV-vis absorption spectra was observed as a color change, which can be used for the naked-eye detection of F− and H2PO4−.研究二茂铁基偶氮苯化合物的光电响应性能及 离子识别性能, 并研究取代基对其离子识别性能 的影响。考察取代基对于二茂铁基偶氮苯化合物的影响, 并提出可能的机理。循环伏安(CV)法和紫外可见吸收光谱(UV-vis) 法。通过CV 法和UV-vis 法研究二茂铁基偶氮苯化 合物的离子识别性能, 发现硝基取代的化合物对 于F−和H2PO4−具有选择性离子识别作用, 而氨 基取代的化合物则识别作用不明显。
Co-reporter:Xianpeng Yang, Haojie Yu, Li Wang, Rongbai Tong, Muhammad Akram, Yongsheng Chen and Xiaoting Zhai
Soft Matter 2015 vol. 11(Issue 7) pp:1242-1252
Publication Date(Web):23 Jan 2015
DOI:10.1039/C4SM02372B
Self-healing polymers, which can spontaneously recover themselves after being ruptured, result in enhanced lifetimes for materials and open up a fascinating direction in material science. Macrocycle-based host–guest interactions, one of the most crucial non-covalent interactions, play a key role in self-healing material fabrication. This review aims to highlight the very recent and important progress made in the area of self-healing polymer materials by focusing on cyclodextrins (CDs), crown ethers, cucurbit[n]urils (CBs), calix[n]arenes and pillar[n]arenes with special guest groups and tailored structures. In addition, we also propose future research directions and hope that this review can in a way reflect the current situation and future trends in this developing area.
Co-reporter:Qing Chen, Haojie Yu, Li Wang, Zain ul Abdin, Yongsheng Chen, Junhua Wang, Weidong Zhou, Xianpeng Yang, Rizwan Ullah Khan, Hongtao Zhang and Xiao Chen
RSC Advances 2015 vol. 5(Issue 83) pp:67459-67474
Publication Date(Web):06 Aug 2015
DOI:10.1039/C5RA10849G
Starch has received much attention as a promising natural material both in biomedical fields and waste water treatment due to its unique biological and adsorptive properties. Recently, the modification of starch is rapidly developed along with its growing applications. This review focuses on the ways of chemical modification of starch including cross-linking, grafting, esterification, etherification, dual modification and so on, and presents the applications of the modified starch in fields like drug delivery, tissue engineering and heavy metal and dye removal.
Co-reporter:Yulai Zhao;Li Wang;Chao Li;Guanghui Jing;Rongbai Tong;Yongsheng Chen
Journal of Applied Polymer Science 2015 Volume 132( Issue 37) pp:
Publication Date(Web):
DOI:10.1002/app.42517
ABSTRACT
This contribution mainly studied the preparation of hyperbranched polyethylene (HBPE) fibers and HBPE/multiwalled carbon nanotube (MWCNT) composite fibers via electrospinning for the first time. Firstly, the effects of solvents, solution concentration, voltage, and rotating speed of collector on the morphology of HBPE fibers were studied. Among the factors, solvent type, concentration, and voltage showed notable influence on the morphology of HBPE fibers. HBPE has an excellent dispersion effect on CNT in organic solvents. Through ultrasonic dispersion, the HBPE solutions with dispersed MWCNT were obtained. Then HBPE/MWCNT composite fibers were obtained with different contents of MWCNT via electrospinning. The effects of voltage and working distance on the morphology of HBPE/MWCNT composite fibers were investigated. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42517.
Co-reporter:Nasir M. Abbasi, Haojie Yu, Li Wang, Zain-ul-Abdin, Wael A. Amer, Muhammad Akram, Hamad Khalid, Yongsheng Chen, Muhammad Saleem, Ruoli Sun, Jie Shan
Materials Chemistry and Physics 2015 Volume 166() pp:1-15
Publication Date(Web):15 September 2015
DOI:10.1016/j.matchemphys.2015.08.056
•Different synthetic techniques for the preparation of AgNWs.•Effect of various factors on the growth of AgNWs.•Deposition of AgNWs on conducting polymer by using thin film.•Improvement of optical and electrical properties of conducting polymers with AgNWs.Silver nanowires (AgNWs)/conducting polymers based nanocomposites are advanced materials for electrical conductive applications. AgNWs have high electrical conductivity, high surface area and high aspect ratio, which are important for the preparation of AgNWs/conducting polymer nanocomposites by using particularly small amounts of AgNWs as conductive filler. The resultant nanocomposite transparent conductive electrodes play a key role in many optoelectronic devices such as touch screen, liquid crystal display, and solar cell. Thus, we carefully selected such published data which is associated with AgNWs/conducting polymers based nanocomposites. This paper gives a comprehensive review on recent development in the synthetic techniques of AgNWs, factors affecting the growth of AgNWs and their applications in conducting polymer nanocomposites. In addition, the effect of various additives (inorganic anions, transition metal cations and molecular species) on size, shape and aspect ratio (length:diameter) of AgNWs has been described in detail. Herein, we also focused on various thin film deposition techniques, for the surface modification of AgNWs with conducting polymers for useful applications such as in touch screen, liquid crystal display and solar cell.
Co-reporter:Rongbai Tong;Li Wang
Journal of Inorganic and Organometallic Polymers and Materials 2015 Volume 25( Issue 5) pp:1053-1059
Publication Date(Web):2015 September
DOI:10.1007/s10904-015-0210-9
Stimuli-responsive hydrogels undergo shape transformation in response to change in ambient environment and have potential applications in tissue engineering, robotics, actuator and biosensing. Generally, the Stimuli-responsive hydrogels are controlled by unique external stimuli and the response is also specific. Here, we developed redox-regulated and temperature responsive macroscopic gel assembly system, using polyacrylamide-based hydrogel, which was functionalized with ferrocene (Fc) as a guest hydrogel and poly(N-isopropylacrylamide) (PNIPAAm) gel modified with β-cyclodextrin as a host hydrogel. It was observed that the variations in the redox potential induced reversible assembly/dissociation transition in a bi-gel strip and optimization of βCD contents provided fast bending speed and large bending degree, which can be applied to develop temperature sensitive switch.
Co-reporter:Guanghui Jing;Li Wang;Jie Shan;Jin Huang
Journal of Polymer Research 2015 Volume 22( Issue 8) pp:
Publication Date(Web):2015 August
DOI:10.1007/s10965-015-0791-6
Polystyrene-based polyHIPEs were synthesized by RAFT polymerization and strengthened by introducing UPy groups (2-Ureido-4[1H] pyrimidinone) into polyHIPEs. Incorporation of UPy groups into polyHIPEs has created pores and controlled the porous morphology of resulting material. Meanwhile, the incorporation of quadruple hydrogen bond introduced some pins into polyHIPE. In comparison to the polyHIPE without reinforcement through quadruple hydrogen bond, the porosity of the reinforced sample was as high as 92 % and its Young’s modulus reached to 28.5 ± 3.9 MPa which was improved by 50 %.
Co-reporter:Muhammad Akram, Li Wang, Haojie Yu, Wael A. Amer, Hamad Khalid, Nasir M. Abbasi, Yongsheng Chen, Zain-ul-Abdin, M. Saleem, Rongbai Tong
Progress in Polymer Science 2014 Volume 39(Issue 12) pp:1987-2009
Publication Date(Web):December 2014
DOI:10.1016/j.progpolymsci.2014.07.009
Currently, most of administered anti-cancer drugs are low molecular weight compounds (as compare to polymers) and hydrophobic in nature. Such small molecular anti-cancer drugs possess fast clearance rate from the blood circulating system and have toxic side effects. Poly(organophosphazenes) have wide range of biomedical applications owing good biocompatibility, sustainability and degradability into non-toxic by-products. So, in this review, we have carefully selected such poly(organophosphazenes), which proved to be good anti-cancer drug carriers because of overcoming crucial issues related to the administration of anti-cancer drugs i.e. poor hydrophilicity, lack of cancer cells specificity, and fast clearance rate from blood circulating system. Thence, the main focus of this review is to highlight the advancement that have been achieved in the synthesis of poly(organophosphazenes) and their application in anti-cancer drug delivery system (DDS).
Co-reporter:Hamad Khalid, Haojie Yu, Li Wang, Wael A. Amer, Muhammad Akram, Nasir M. Abbasi, Zain ul-Abdin and Muhammad Saleem
Polymer Chemistry 2014 vol. 5(Issue 24) pp:6879-6892
Publication Date(Web):11 Sep 2014
DOI:10.1039/C4PY01057D
Individually, ferrocene and thiophenes have incredible properties and important applications. During the last two decades, scientists synthesized polythiophenes containing ferrocene in the main and side chains. Polythiophenes have redox, conducting, and optical properties. Because of these properties, polythiophenes have been used in sensing applications. In addition, ferrocene has reversible redox properties and accordingly has been used in a lot of sensing devices, such as glucose sensing. Ferrocene can have +2 or +3 oxidation state, which can correspond to “0” and “1”, and thus can be used as a memory storage material. When these two moieties are combined together, they show good compatibility. Therefore, the resulting materials/polymers have been used in memory storage and chemical sensing devices. Thus, we carefully selected studies that are only associated with ferrocene-based polythiophenes. In this review, we tried to focus on the synthesis and applications of ferrocene-based polythiophenes. There are many methods for the polymerization of thiophenes. Here, we discussed the electrochemical polymerization, oxidation polymerization, nickel mediated coupling reactions, and Suzuki polycondensation. In addition, polythiophenes can be decorated with ferrocene, pre- or post-polymerization. These materials were examined for important applications, including information storage, DNA sensing, protein sensing, and glucose sensing materials.
Co-reporter:Zhifei Tian, Haojie Yu, Li Wang, Muhammad Saleem, Fujie Ren, Pengfei Ren, Yongsheng Chen, Ruoli Sun, Yubiao Sun and Liang Huang
RSC Advances 2014 vol. 4(Issue 54) pp:28195-28208
Publication Date(Web):30 Jun 2014
DOI:10.1039/C4RA03146F
Research on composites/blends containing polyaniline (PANI) has attracted numerous scientists and engineers due to their excellent adhesion and anticorrosive properties. Nano-structured PANI composites and matrix resins play a key role in physical and anticorrosive performance. This paper reviews the synthesis, growth mechanisms and corrosion application with different resin coatings of PANI-based nano-composites. It also highlights the failures of corrosion protection and methods and suggestions to improve it.
Co-reporter:Fujie Ren, Haojie Yu, Li Wang, Muhammad Saleem, Zhifei Tian and Pengfei Ren
RSC Advances 2014 vol. 4(Issue 28) pp:14419-14431
Publication Date(Web):21 Jan 2014
DOI:10.1039/C3RA46989A
In modern times, with the rapid development of technology, science and economy, applications of electromagnetic (EM) wave absorption in both commercial and military fields have increased. Meanwhile, the problems brought by EM wave absorption have gradually become obvious, such as signal interference, back-radiation of microstrip radiators and so on. Furthermore, the impact of EM wave radiation on human health has also attracted much public attention. In this regard, the application of EM wave absorbing materials has become a focus of current research. Due to their unique chemical, physical, and mechanical properties, carbon nanotubes (CNTs), through certain modifications for light mass, wide range and strong absorption, have great potential to be used as excellent EM wave absorbents. This review highlights recent research into the modification of CNTs, with special emphasis on their EM wave absorbing ability.
Co-reporter:Zain-ul -Abdin, ;Li Wang;Muhammad Saleem;Hamad Khalid;Nasir M. Abbasi ;Muhammad Akram
Applied Organometallic Chemistry 2014 Volume 28( Issue 8) pp:567-575
Publication Date(Web):
DOI:10.1002/aoc.3166
One of the most important components of solid rocket propellant is the burning rate catalysts (BRC) which enhance burning rate of solid composite propellant. Low-pressure exponents and stable burning rate are the key features of an excellent solid propellant. Addition of BRC to the propellant results in the increase of burning rate of the propellant and decrease in pressure exponents. Among all BRC, ferrocene-based BRC have attracted much attention because of their better microscopic homogeneities in distribution, ignitability of the propellants and good compatibility with organic binder. However, the main barrier for the development and practical applications of ferrocene-based BRC is their migration property. This article reviews the field and highlights recent progress. Copyright © 2014 John Wiley & Sons, Ltd.
Co-reporter:Rongbai Tong, Yulai Zhao, Li Wang, Haojie Yu, Fujie Ren, Muhammad Saleem, Wael A. Amer
Journal of Organometallic Chemistry 2014 Volume 755() pp:16-32
Publication Date(Web):1 April 2014
DOI:10.1016/j.jorganchem.2013.12.052
•Research progress of Fc based BR catalysts are reviewed.•Approaches to improve the Fc based BR catalysts have focused.•The catalytic properties of Fc based BR catalysts are presented.•The anti-migration mechanism of Fc based BR catalysts are discussed.An excellent solid propellant should have an extremely stable burning rate and a low pressure exponent. To achieve this aim one of the best ways is to add a burning rate catalyst into the propellant. Efficient ferrocene (Fc)-based burning rate (BR) catalysts with superior performance have attracted intense attention. This review addresses the recent research progress in BR catalysts of Fc-based polymers and derivatives. The migration has been considered as the main barrier for the development and the practical applications of Fc-based polymers and derivatives BR catalysts. In this review several pioneering methods are presented for the synthesis of Fc-based polymers with high efficient burning rate properties and/or low migration properties. In addition, a compendium of the recent progress in synthesis of Fc derivatives with BR catalytic properties is contained. The catalytic mechanism and migration mechanism of Fc-based polymers and derivatives BR catalysts are highlighted.An excellent solid propellant can be achieved by adding burning catalyst into the propellant. In this review, the recent progress in synthesis of ferrocene based polymer and derivatives, several pioneering methods, catalytic and migration mechanism along with migration as a barrier in this field is discussed.
Co-reporter:Ruoli Sun, Li Wang, Haojie Yu, Zain-ul- Abdin, Yongsheng Chen, Jin Huang, and Rongbai Tong
Organometallics 2014 Volume 33(Issue 18) pp:4560-4573
Publication Date(Web):May 1, 2014
DOI:10.1021/om5000453
In the field of electrochemical detection, ferrocene has a promising application prospect in view of its impact as a component of molecular receptors and sensing materials. In this review, we aim to describe the principle of ferrocene-based electrochemical detection and further discuss its design and performances. In particular, two forms of detection, molecular recognition and sensing systems, were specified. Ferrocene-based molecular receptors with all kinds of structures covering derivatives, polymers, and supramolecular receptors are presented. Benefits of their structures to the recognition behavior are compared and discussed. In electrochemical sensors, the ferrocene-containing component is used as a mediator or a label. The architectural design, enhancement effect of additives, and the structures of ferrocene-containing components in the corresponding sensors are discussed in this review. Among sensors with different structures, film-type, sandwich-type, and displacement-type sensors are the main architecturally designed sensors. In addition, auxiliary materials such as conducting carbon materials (carbon nanotubes, graphene, and graphene oxide), nanoparticles (magnetic nanoparticles and gold nanoparticles), and modified saccharides which provide synergy in the conductivity and biocompatibility for ferrocene-containing sensors will be discussed as well.
Co-reporter:Yulai Zhao;Li Wang;Guanghui Jing;Chao Li
Journal of Polymer Research 2014 Volume 21( Issue 6) pp:
Publication Date(Web):2014 June
DOI:10.1007/s10965-014-0470-z
This contribution reported a facile approach to bimodal polyethylene (BMPE) with a consecutively tunable molecular weight distribution (MWD). The BMPEs were synthesized from ethylene polymerization catalyzed by α-diimine Ni complex/rac-ethylenebis(indenyl) zirconium chloride (rac-Et(Ind)2ZrCl2)/MAO in the presence of diethyl zinc (ZnEt2). From GPC results, PE samples with molecular weight (MW) ranging from 78.9 kg/mol to 1.5 kg/mol and PDI varying gradually from 2.5 to 12.7 were obtained via simply adjusting the equiv. of ZnEt2. The combination of Soxhlet extraction and GPC analysis indicated that the obtained BMPEs consist of soluble fractions with higher molecular weights and residual fractions with lower molecular weights. The crystallization processes and crystal morphologies of the BMPEs were recorded by polarized optical microscope (POM). Additionally, the influence of the obtained BMPE on the mechanical properties of commercial high density polyethylene (HDPE) after melt blending was studied via dynamic mechanical analysis (DMA).
Co-reporter:Yubiao Sun;Li Wang;Yulai Zhao
Journal of Inorganic and Organometallic Polymers and Materials 2014 Volume 24( Issue 3) pp:491-500
Publication Date(Web):2014 May
DOI:10.1007/s10904-014-0021-4
In this article, a functional ferrocene-based metalloligand has been synthesized and used as the building block to assemble novel coordination polymer microspheres. Specifically, this metalloligand was coordinated with two different types of metal ions (Co2+ and Mn2+) to fabricate two different but isostructural microspheres under solvothermal conditions. To deepen our understanding of the formation process of the coordination polymer microspheres, a growth mechanism has been proposed based on the morphology change of these spheres throughout the whole reaction process. Furthermore, the prepared multi disperse microspheres, in the form of hollow spheres with high thermostability, can be applied to store hydrogen for their promising hydrogen uptake capacity (1.84wt% for CPM-1 and 1.00 wt% for CPM-2 at 163 K under 5 MPa). Moreover, the different adsorption enthalpies of these two materials that relevant to the varied hydrogen uptake capacity have been calculated, compared and explained.
Co-reporter:Lei Zhang;Li Wang;Hao-jie Yu
Journal of Zhejiang University-SCIENCE A 2013 Volume 14( Issue 7) pp:504-513
Publication Date(Web):2013 July
DOI:10.1631/jzus.A1300119
A type of azobenzene-containing block copolymer polymethyl methacrylate-b-poly (n-butylmethacrylate-co-6-(4-(phenylazo) benzoate) hexyl methacrylate) (PMMA-b-(PnBMA-co-PAzoMA)) was synthesized by the atom transfer radical polymerization (ATRP). Macroinitiator polymethyl methacrylate (PMMA) was prepared by ATRP and used to initiate the copolymerization of monomern-butyl methacrylate (nBMA) and azobenzene-based methacrylate monomer (AzoMA). Herein, three block copolymers with different molecular weights and block volume fractions were obtained and spin-coated on a silicon substrate or quartz plate before annealing at 180 °C for 14 h. The surface morphologies in these annealed copolymer films were observed by atomic force microscopy (AFM). Bicontinuous stripe or island patterns with different sizes were formed dependent on the film thickness. These ordered patterns are considered to be formed arising from the dewetting process of the surface layer in the copolymer film. Photoisomerization of azobenzene units in the copolymer films changed the dewetting behaviors of the surface layer of the thin film. Therefore, some copolymer annealed films showed a reversible morphology conversion between bicontinuous stripe and island structure when exposed to UV light and upon being stored in the dark. It was found that the composition of the block copolymer had obvious influences on the photoinduced morphology conversion behaviors in these copolymer thin films. When the volumes of PnBMA and PAzoMA phases in the block copolymer were large enough, the surface morphology could be modulated by UV light irradiation and storage in the dark. This work proposes a new possibility for photoinduced control and design of the dewetting processes of thin films using a linear block copolymer.
Co-reporter:Yulai Zhao, Li Wang, Anguo Xiao, Haojie Yu
Progress in Polymer Science 2010 Volume 35(Issue 10) pp:1195-1216
Publication Date(Web):October 2010
DOI:10.1016/j.progpolymsci.2010.05.002
Research on the synthesis of modified polyethylene (PE) is of great significance to both academic study and industrial applications. The synthesis of modified polyethylene has experienced remarkable and significant progress in the control over the microstructure, composition, molecular weight and molecular weight distribution of the polymeric products. This review summarizes the achievements in the synthesis of modified polyethylene via combining coordination polymerization with atom transfer radical polymerization (ATRP), reversible addition-fragmentation chain transfer (RAFT) polymerization, nitroxide-mediated radical polymerization (NMRP) or ring-opening polymerization (ROP) for the last decade. In addition, the mechanisms of the aforementioned polymerization techniques are expounded in this contribution.
Co-reporter:Junhua Wang, Li Wang, Haojie Yu, Zain-ul-Abdin, Yongsheng Chen, Qing Chen, Weidong Zhou, Hongtao Zhang, Xiao Chen
International Journal of Biological Macromolecules (July 2016) Volume 88() pp:333-344
Publication Date(Web):1 July 2016
DOI:10.1016/j.ijbiomac.2016.04.002
Because of the unique chemical structure, chitosan and its derivatives have been paid close extensive attention as the potential bio-functional material. This review presents recent synthesis of modified chitosan via N-substitution, O-substitution, free radical graft copolymerization and other modification methods and properties of the modified chitosan. The applications of the modified chitosan in metal ions adsorption, dye removal and pharmaceutical fields are illustrated as well. The rapid development in the modification of chitosan describes broad perspectives of the modified chitosan.
![Ferrocene, [[2-[(2-methyl-1-oxo-2-propen-1-yl)oxy]ethoxy]carbonyl]-, homopolymer](/data/chemimg/3781500/1202813-08-8.png)
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![Ferrocene, [[2-[(2-methyl-1-oxo-2-propen-1-yl)oxy]ethoxy]carbonyl]-](/data/chemimg/3779800/1189340-32-6.png)
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