Co-reporter:Jun Qian, Juan Ma, Jiacan Su, Yonggang Yan, Hong Li, Jung-Woog Shin, Jie Wei, Liming Zhao
European Polymer Journal 2016 Volume 75() pp:291-302
Publication Date(Web):February 2016
DOI:10.1016/j.eurpolymj.2015.12.026
•The bioactive MPZ ternary composite were prepared by the solvent casting method.•The MPZ presented excellent hydrophilicity, in vitro degradability and bioactivity.•The MPZ composite could promote cell adhesion, proliferation and differentiation.Bioactive ternary composite containing nano magnesium calcium phosphate (n-MCP), poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) and zein (ZN) were fabricated by the solvent casting method. The results showed that incorporation of n-MCP and ZN into PHBV was conducive to enhancing the hydrophilicity, in vitro degradability, and bioactivity of the n-MCP/PHBV/ZN (MPZ) ternary composite. The results of cell experiments revealed that the MPZ ternary composite containing n-MCP and ZN could significantly promote the cell proliferation and enhance alkaline phosphatase (ALP) activity of MC3T3-E1 cells. In addition, the cells with normal phenotype spread well on the MPZ surface, and attached to the substrate, indicating good cytocompatibility of MPZ. The results demonstrated that the MPZ ternary composite with improved physical–chemical and biological performances might be considered as a potential candidate for biomedical applications.Morphology of MC3T3-E1 cells cultivated on the surface of MPZ ternary composite (containing nano-sized magnesium calcium phosphate, poly(hydroxybutyrate-co-hydroxyvalerate) and zein) for 3 days by scanning electron microscope (SEM).
Co-reporter:Hui Lei, Jun Xiao, Liping Zheng, Mingna Xiong, Yanrong Zhu, Jun Qian, Qixin Zhuang, Zhewen Han
Polymer 2016 Volume 86() pp:22-31
Publication Date(Web):8 March 2016
DOI:10.1016/j.polymer.2016.01.026
•Superhydrophobic coating fabricated via colloid silica and fluoropolymer.•Superhydrophobic coating developed by simple process: mixing silica with fluorocopolymer followed by spray.•The effects of particle functionalities, volume fraction and dimension on coating properties systematically investigated.•Superhydrophobicity (water contact angle ~ 155° and rolling angle ~ 1°) and desired integrity achieved.Superhydrophobic coating system was developed with colloidal silica and crosslinkable fluorocopolymer as filler and matrix respectively, to yield low surface energy and chemical stability, high hardness, and strong adhesion with substrates. The effects of particle surface functionalities, volume fraction and dimension on hydrophobicity and integrity of coatings were systematically investigated. The coating performance was closely dependent on these three factors. Superhydrophobicity (water contact angle ∼155° and rolling angle ∼ 1°) and desired integrity was observed in the coatings with fluorinated particles (with dimension of either 340 or 1450 nm) at optimal particle volume fraction of 60%.
Co-reporter:Xinliang Fang, Xiaoyun Liu, Zhong-Kai Cui, Jun Qian, Jijia Pan, Xinxin Li and Qixin Zhuang
Journal of Materials Chemistry A 2015 vol. 3(Issue 18) pp:10005-10012
Publication Date(Web):30 Mar 2015
DOI:10.1039/C5TA00943J
This study proposes a novel and facile method to synthesize high-quality NH2-functionalized and carboxyl-functionalized graphene oxide (PPD–CFGO)/polyimide (PI) composite films with high dielectric constant (ε), low dielectric loss, high-temperature resistance and outstanding mechanical properties by in situ polymerization. In addition to the partial carboxyl groups located at the edges, the ample hydroxyl and epoxy groups bonded on the basal plane of graphene sheets were exploited to covalently bond to the amines. GO was modified by oxalic acid to obtain carboxyl-functionalized GO (CFGO) before amidation. NH2-functionalized CFGO (PPD–CFGO), dispersing well in dimethylacetamide (DMAc), was the initial platform for polymer grafting to improve the CFGO dispersion in the polymer matrix. Partially reduced graphene nanosheets are formed during the imidization process. The PPD–CFGO/PI composite films exhibit high tensile strength (up to 848 MPa) and Young's modulus (18.5 GPa). The thermogravimetric analysis results indicate that the PPD–CFGO/PI composites have good thermal stability below 500 °C. The dielectric constant increases up to 36.9 with an increasing amount of PPD–CFGO, higher than that of the pure PI polymer by a factor of 12.5, while the dielectric loss is only 0.0075 and the breakdown strength still remains at a high level (132.5 ± 9.3 MV m−1).
Co-reporter:Jia Wei, Shuo Zhang, Xiaoyun Liu, Jun Qian, Jiasong Hua, Xinxin Li and Qixin Zhuang
Journal of Materials Chemistry A 2015 vol. 3(Issue 15) pp:8205-8214
Publication Date(Web):12 Mar 2015
DOI:10.1039/C5TA01410G
Different from traditional microwave absorbing nanoparticles as fillers in non-mechanical coatings, the BaTiO3/MWNT/PBO ternary composites can be potentially used as a structural microwave absorption device in broader applications, especially in the aerospace industry. BaTiO3 particles with a diameter of 5–15 nm were immobilized onto the surface of MWNTs via a solvothermal synthesis method. BaTiO3/MWNT/PBO ternary composites with varied compositions were then prepared via the in situ polymerization of p-phenylenebenzobisoxazole (PBO) with a uniform dispersion of BaTiO3/MWNT nanocomposites in the polymer-poly p-phenylenebenzobisoxazole (PBO)-matrix (a conjugated polymer with splendid mechanical properties and thermal stability). The BaTiO3/MWNT/PBO composites possessed outstanding microwave absorbing performances in addition to desirable mechanical properties and thermal stability.
Co-reporter:Yong Chen;Kan Zhang;Xiaoyun Liu;Qixin Zhuang ;Zhewen Han
Polymer Composites 2015 Volume 36( Issue 5) pp:884-891
Publication Date(Web):
DOI:10.1002/pc.23007
A series of magnetic fluorinated polybenzobisoxazole (6FPBO)/silica-coated Fe3O4 magnetic nanoparticles composites were synthesized through in-situ polymerization. The structure and morphology of the obtained nanocomposites were characterized by X-ray diffraction, transmission electron microscopy, and scanning electronic microscope (SEM). The SEM images indicated that the crosslinking structure is formed in magnetic 6FPBO nanocomposites. The magnetic and electromagnetic properties of magnetic 6FPBO nanocomposites in the 2–18 GHz frequency range were characterized by vibration sample magnetometer and vector network analyzer, respectively. The calculated reflection loss of the as-prepared magnetic 6FPBO nanocomposites showed that the best microwave absorption reached to −20 dB at 17 GHz with a matching thickness of 3.00 mm. POLYM. COMPOS., 36:884–891, 2015. © 2014 Society of Plastics Engineers
Co-reporter:Xufeng Lin;Shouyi Zhang
Journal of Coatings Technology and Research 2014 Volume 11( Issue 3) pp:319-328
Publication Date(Web):2014 May
DOI:10.1007/s11998-013-9520-4
A series of ultraviolet (UV)-curable waterborne hyperbranched polyurethane dispersions (WHPUDs) have been successfully synthesized by modifying the hyperbranched polyester H10, which was prepared using pentaerythritol as a core molecule and dimethylolpropionic acid as monomers, with succinic anhydride, toluene diisocyanate (TDI), and hydroxypropyl acrylate (HPA). The H10 was characterized by 1H nuclear magnetic resonance spectroscopy and matrix-assisted laser desorption/ionization time of flight mass spectrometry. The properties of the WHPUDs with different content of succinic anhydride and TDI–HPA have been investigated by measuring the stability, the particle size, and the rheological behavior. The effects of the content of succinic anhydride and TDI–HPA were studied in terms of UV-curing rate, water resistance, and thermogravimetric behaviors of WHPUD coatings. The WHPUDs showed good appearance, particle size, viscosity, and storage stability. The WHPUD films showed superior photosensitivity and the percent conversion of C=C bonds reached about 80% when the radiation time was 50 s. Moreover, the UV-cured films had good water resistance and thermostability, which can benefit a waterborne polyurethane resin for waterborne coatings.
Co-reporter:Yong Chen, Jun Qian, Xiaoyun Liu, Qixin Zhuang and Zhewen Han
New Journal of Chemistry 2013 vol. 37(Issue 8) pp:2500-2508
Publication Date(Web):17 May 2013
DOI:10.1039/C3NJ00355H
The stable acidic dispersion of reduced graphene oxide (RGO) is prepared by a non-covalent functionalization method using perylenebisimide-modified fluorinated poly(hydroxyamide) (PTCDA-6FPHA). Then a series of RGO–polybenzoxazole (PBO) composites were prepared by a solution blending method in MSA. The change of perylenebisimide absorption peaks in the UV-Vis absorption spectra indicates that π–π stacking indeed occurs between graphene and perylene rings. The conjugation between functionalized RGO and PBO molecular chains increases the conjugation degree of the composite, since the PTCDA-6FPHA-containing perylene rings have a high π-electron delocalization degree. The energy gap of RGO–PBO composite is 2.72 eV with the absorption edge at 456 nm. The corresponding data of pure PBO film are 2.78 eV and 446 nm, respectively. Moreover, the intensity of the two emission peaks at 442 and 467 nm in the PL emission spectra of RGO–PBO decreases rapidly along with the increase of RGO–PBO ratio. The intensity of the weak emission peak at 622 nm increases with the increase of the RGO–PBO ratio. This behavior can be attributed to the energy transfer between benzoxazole chromophore units and functionalized RGO. Meanwhile, the RGO–PBO composite has outstanding thermal stability.
Co-reporter:Jun Qian;Junling Wu;Xiaoyun Liu;Qixin Zhuang ;Zhewen Han
Journal of Applied Polymer Science 2013 Volume 127( Issue 4) pp:2990-2995
Publication Date(Web):
DOI:10.1002/app.37970
Abstract
Smooth polybenzobisoxazole (PBO) fiber has limited interfacial interaction with resin matrix. In this article, nano-TiO2 coating on PBO fiber is applied to improve the interfacial adhesion between PBO fiber and epoxy resin. The test results suggest that the PBO fiber had good interaction with epoxy resin matrix after its treatment with n-TiO2 sol. Nano TiO2 particle embedded onto PBO fiber surface, acting as a chock, which made fiber implanted into the resin better. This greatly improved the shear strengths (IFSS) of PBO fiber/epoxy resin composite. It has been found that a 56% increase in interfacial IFSS has achieved without sacrificing mechanical properties of fiber. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Co-reporter:Jia Wei, Shuo Zhang, Xiaoyun Liu, Jun Qian, Jiasong Hua, Xinxin Li and Qixin Zhuang
Journal of Materials Chemistry A 2015 - vol. 3(Issue 15) pp:NaN8214-8214
Publication Date(Web):2015/03/12
DOI:10.1039/C5TA01410G
Different from traditional microwave absorbing nanoparticles as fillers in non-mechanical coatings, the BaTiO3/MWNT/PBO ternary composites can be potentially used as a structural microwave absorption device in broader applications, especially in the aerospace industry. BaTiO3 particles with a diameter of 5–15 nm were immobilized onto the surface of MWNTs via a solvothermal synthesis method. BaTiO3/MWNT/PBO ternary composites with varied compositions were then prepared via the in situ polymerization of p-phenylenebenzobisoxazole (PBO) with a uniform dispersion of BaTiO3/MWNT nanocomposites in the polymer-poly p-phenylenebenzobisoxazole (PBO)-matrix (a conjugated polymer with splendid mechanical properties and thermal stability). The BaTiO3/MWNT/PBO composites possessed outstanding microwave absorbing performances in addition to desirable mechanical properties and thermal stability.
Co-reporter:Xinliang Fang, Xiaoyun Liu, Zhong-Kai Cui, Jun Qian, Jijia Pan, Xinxin Li and Qixin Zhuang
Journal of Materials Chemistry A 2015 - vol. 3(Issue 18) pp:NaN10012-10012
Publication Date(Web):2015/03/30
DOI:10.1039/C5TA00943J
This study proposes a novel and facile method to synthesize high-quality NH2-functionalized and carboxyl-functionalized graphene oxide (PPD–CFGO)/polyimide (PI) composite films with high dielectric constant (ε), low dielectric loss, high-temperature resistance and outstanding mechanical properties by in situ polymerization. In addition to the partial carboxyl groups located at the edges, the ample hydroxyl and epoxy groups bonded on the basal plane of graphene sheets were exploited to covalently bond to the amines. GO was modified by oxalic acid to obtain carboxyl-functionalized GO (CFGO) before amidation. NH2-functionalized CFGO (PPD–CFGO), dispersing well in dimethylacetamide (DMAc), was the initial platform for polymer grafting to improve the CFGO dispersion in the polymer matrix. Partially reduced graphene nanosheets are formed during the imidization process. The PPD–CFGO/PI composite films exhibit high tensile strength (up to 848 MPa) and Young's modulus (18.5 GPa). The thermogravimetric analysis results indicate that the PPD–CFGO/PI composites have good thermal stability below 500 °C. The dielectric constant increases up to 36.9 with an increasing amount of PPD–CFGO, higher than that of the pure PI polymer by a factor of 12.5, while the dielectric loss is only 0.0075 and the breakdown strength still remains at a high level (132.5 ± 9.3 MV m−1).
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