Facile synthesis of silicapolymer hybrids via simultaneous RAFT process and hydroxyl-alkoxysilane coupling reaction  

作　　者：Chunnuan YE Weina QI Xinhua YU Peipei ZHANG Tengteng HOU Youliang ZHAO 

机构地区：[1]Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application,Department of Polymer Science and Engineering,College of Chemistry,Chemical Engineering and Materials Science,Soochow University,Suzhou 215123,China

出　　处：《Frontiers of Chemistry in China》2011年第3期213-220,共8页中国化学前沿（英文版）

基　　金：The financial support from the National Natural Science Foundation of China(Grant Nos.20844001,20874067 and 21074081);the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions is gratefully acknowledged.

摘　　要：This study aimed at the synthesis of silica particles grafted with better-defined homopolymers and block copolymers by tandem approach.Z-functionalized Sbenzyl S’-(3-trimethoxysilyl)propyltrithiocarbonate(BTPT)was used as a couplable RAFT agent to synthesize the target inorganic-organic hybrids.Simultaneous coupling reaction and RAFT process using silica particles and BTPT as raw materials efficiently afforded homopolymers grafted silica,and RAFTsynthesized macro chain transfer agents withω-terminal trimethoxysilane moiety were utilized to mediate graft reaction to prepare silica particles grafted with di-,tri-and tetrablock copolymers comprised of polymer segments such as polystyrene,polyacrylamides and polyacrylates.When the grafted chains had molecular weights ranging between 3920 and 24800 g/mol,the molar grafting ratios,which were dependent on reaction conditions and types and compositions of grafted chains,were estimated to be in the range of 15.2–101μmol/g,and grafted polymers usually had polydispersity indices lower than 1.3,revealing that the grafting process was almost controllable.To the best of our knowledge,this versatile tandem approach is one of the most facile techniques to prepare silica particles grafted with polymeric chains with controlled molecular weight,low polydispersity and precise composition due to its minimal reaction steps,mild conditions,straightforward synthesis and satisfactory controllability.

关 键 词：hybrid material reversible addition fragmentation chain transfer(RAFT) coupling reaction block copolymer surface modification 

分 类 号：O63[理学—高分子化学]