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Preparation and Characterization of Chitosan Composite Membranes crosslink.d by Carboxyl-capped Poly(ethylene glycol)

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Chinese Journal of Polymer Science 2014年第2期32卷 236-244页

作者： Meng-tan Cai Jia-xing Zhang 陈元维 Jun Cao Meng-tian Leng Shao-dong Hua 罗祥林 College of Polymer Science and Engineering Sichuan University State Key Laboratory of Polymer Materials and Engineering Sichuan University

In this study a series of chemically crosslink.d chitosan/poly（ethylene glycol）（CS/PEG） composite membranes were prepared with PEG as a crosslink.ng reagent other than an additional blend. First, carboxyl-eapped poly（ethylene glycol）（HOOC-PEG-COOH） was synthesized. Dense CS/PEG composite membranes were then prepared by casting/evaporation of CS and HOOC-PEG-COOH mixture in acetic acid solution. Chitosan was chemically crosslink.d due to the amidation between the carboxyl in HOOC-PEG-COOH and the amino in chitosan under heating, as confirmed by FTIR analysis. The hydrophilicity, water-resistance and mechanical properties of pure and crosslink.d chitosan membranes were characterized, respectively. The results of water contact angle and water absorption showed that the hydrophilicity of chitosan membranes could be significantly improved, while no significant difference of weight loss between pure chitosan membranes and crosslink.d ones was detected, indicating that composite membranes with amidation crosslink.ng possess excellent water resistanance ability. Moreover, the tensile strength of chitosan membranes could be significantly enhanced with the addition of certain amount of HOOC-PEG-COOH crosslink.r, while the elongation at break didn＇t degrade at the same time. Additionally, the results of swelling behaviors in water at different pH suggested that the composite membranes were pH sensitive.

关键词： Chitosan Membrane Poly(ethylene glycol) crosslink.

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A NOVEL METHOD TO PREPARE crosslink.D POLYETHYLENEIMINE HOLLOW NANOSPHERES

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Chinese Journal of Polymer Science 2007年第5期25卷 431-435页

作者：何斌顾忠伟 Engineering Research Center of Biomaterials Sichuan University National Engineering Research Center for Biomaterials

A novel method to prepare crosslink.d polyethyleneimine （CPEI） hollow nanospheres was reported. Uniform silica nanospheres were used as templates, 3-aminopropyl trimethoxysilane （APS） was immobilized on the surface of silica nanospheres as couple agent. Aziridine was initiated ring-opening polymerization with the amino groups in APS to form polyethyleneimine （PEI） shell layer. 1,4-Butanediol diacrylate was utilized to crosslink.PEI polymeric shell. The silica nanospheres in core were etched by hydrofluoric acid to obtain hollow CPEI nanospheres. The hollow nanospheres were characterized by X-ray photoelectron spectroscopy （XPS）, transmission electron microscopy （TEM）, and thermogravimetric analysis （TGA）.

关键词： Hollow nanospheres Polyethyleneimine Template crosslink.

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