Preparation and Characterization of Polymeric Microspheres Having Isotactic Poly(methacrylic acid) on Their Surfaces  

作　　者：CHEN Ming-qing LIU Xiao-ya YANG Cheng AKASHI Mitsuru 

机构地区：[1]School of Chemical and Material Engineering,Southern Yangtze University,Wuxi 214036,P.R.China [2]Department of Applied Chemistry and Chemical Engineering,Faculty of Engineering,Kagoshima University,Kagoshima 890-0065,Japan

出　　处：《Chemical Research in Chinese Universities》2002年第1期61-64,共4页高等学校化学研究(英文版)

基　　金：Supported by the Foundation for U niversity Key Teacher by The Ministry of Education,P. R. China and was supported in part by the Grant- in- Aid for Scientific Research on Priority Areas,"New Polym ers and Their Nano- Organized System s"(No.2 77/ 10 5

摘　　要：A poly（ tert -butyl methacrylate）（PBMA） macromonomer was synthesized by anionic polymerization with bis（2,6-di- t -butyl phenoxy） methyl aluminum [MeAl（ODBP）2] as the initiator and trimethylsilylmethacrylate（TMSMA） as the end capping agent in dry THF. Then, a poly（methacrylic acid）（PMAA） macromonomer was obtained by means of hydrolysis reaction from the PBMA macromonomer in the presence of hydrochloric acid. The structures of the PBMA macromonomer were characterized by using 1H NMR. It was found that the resulted PBMA macromonomer has highly isotactic properties and the PMAA macromonomer has an end vinyl group on per polymer chain. The monodisperse polymeric microspheres, which consisted of polystyrene cores and PMAA branches on their surfaces, were prepared by the dispersion copolymerization of styrene with the PMAA macromonomer in an ethanol/water mixed solvent. It was found that the concentration of the PMAA macromonomer would affect the microsphere formation, the morphology and its size in the copolymerization system.A poly( tert -butyl methacrylate)(PBMA) macromonomer was synthesized by anionic polymerization with bis(2,6-di- t -butyl phenoxy) methyl aluminum [MeAl(ODBP)2] as the initiator and trimethylsilylmethacrylate(TMSMA) as the end capping agent in dry THF. Then, a poly(methacrylic acid)(PMAA) macromonomer was obtained by means of hydrolysis reaction from the PBMA macromonomer in the presence of hydrochloric acid. The structures of the PBMA macromonomer were characterized by using 1H NMR. It was found that the resulted PBMA macromonomer has highly isotactic properties and the PMAA macromonomer has an end vinyl group on per polymer chain. The monodisperse polymeric microspheres, which consisted of polystyrene cores and PMAA branches on their surfaces, were prepared by the dispersion copolymerization of styrene with the PMAA macromonomer in an ethanol/water mixed solvent. It was found that the concentration of the PMAA macromonomer would affect the microsphere formation, the morphology and its size in the copolymerization system.

关 键 词：MACROMONOMER Isotactic structure Dispersion copolymerization MICROSPHERE 

分 类 号：O632[理学—高分子化学]