The Surface Properties of PAVAc Prepared by Dispersion Polymerization in ScCO_2  

作　　者：杨亚军 王孜 胡春圃 董擎之 

机构地区：[1]Key Laboratory for Ultrafine Materials,Ministry of Education

出　　处：《Journal of Donghua University(English Edition)》2008年第1期53-57,共5页东华大学学报（英文版）

基　　金：National Natural Science Foundation of China (No20674017)

摘　　要：Dispersion copolymerization of acryionitrile-vinyi acetate （AN-VAc） has been successfully performed in supercriticai carbon dioxide （ScCO2） with a series of iipophilic/CO2-philic diblock copolymers, such as poly（ styrener-acrylonitrile）-b- poly （ 1, 1, 2, 2-tetrahydroperfluorooctyl methacrylate） （PSAN-b-PFOMA）, as steric stabilizers. The structure and the particle morphology of the product were characterised by FT-IR and SEM. In addition, the effects of the stabilizer on the surface properties of the products were investigated in detail. Results indicate that the surface free energy of the poly （AN-r-VAc） （PAVAc） film decreases dramatically because of the existence of the stabilizer. And, when the initial concentration of the monomer was 10% （the mass （g） of monomer to the volume （mL） of ScCO2 ） the optimal concentration of the stabilizer is about 5% （w/w% to monomers）.Dispersion copolymerization of acrylonitrile-vinyl acetate(AN-VAc) has been successfully performed in supercritical carbon dioxide(ScCO2) with a series of lipophilic/CO2-philic diblock copolymers,such as poly(styrene-r-acrylonitrile)-b-poly(1,1,2,2-tetrahydroperfluorooctyl methacrylate)(PSAN-b-PFOMA),as steric stabilizers.The structure and the particle morphology of the product were characterised by FT-IR and SEM.In addition,the effects of the stabilizer on the surface properties of the products were investigated in detail.Results indicate that the surface free energy of the poly(AN-r-VAc)(PAVAc) film decreases dramatically because of the existence of the stabilizer.And,when the initial concentration of the monomer was 10%(the mass(g) of monomer to the volume(mL) of ScCO2) the optimal concentration of the stabilizer is about 5%(w/w% to monomers).

关 键 词：PAVAc dispersion polymerization ACRYLONITRILE vinyl acetate surface free energy ScCO2 

分 类 号：O631.5[理学—高分子化学]