应用化学2011，Vol.28Issue(9)：999-1005,7.DOI:10.3724/SP.J.1095.2011.00621
苯乙烯的单电子转移活性自由基聚合
Single Electron Transfer Living Radical Polymerization of Styrene
摘要
Abstract
The polystyrene ( PSt) was synthesized by a single electron transfer living radical polymerization (SET-LRP) in a binary mixture of dimethyl sulfoxide ( DMSO) and water using 2,2-dibromomethyl-l ,3-dibromopropane as the multifunctional initiator, Cu° powder and tris-(2-dimethylamino ethyl) amine ( Me6-TREN) as catalytic system. The resulting polymers were analyzed by ' H NMR and GPC, the results showed that the distribution of the resulting polymer was narrow ( Mw/Mn = 1.20, MnGPC =25.3 x 103, 42.6% conversion) and the polymers prepared were star shape and had perfect chain ends -Br retention. In addition, the kinetic plots of polymerization were first order, which indicated a living polymerization process. The various factors which had affected the SET-LRP of St such as solvent, polymerization temperature and phase transfer catalyst (PTC) were studied, and the results showed that the H2O content in the binary mixtures increasing form 10% to 20% (volume fraction) led to a reduction in polymerization rate, which could be revealed by the apparent polymerization rate constant ( kPapp) of 0.019 7 h-1 reducing from 0.026 4 h-1. Meanwhile the A:°pp increased in according with enhancing the polymerization temperature, increasing the amount of catalyst or adding the PTC. The addition of PTC or increasing the amount of catalyst could improve the control of the polymerization.关键词
单电子转移活性自由基聚合/聚苯乙烯/相转移催化剂/星形聚合物Key words
single electron transfer living radical polymerization/ polystyrene/ phase transfer catalyst/ star polymer分类
化学化工引用本文复制引用
丁伟,吕崇福,孙颖,景慧,魏继军,栾和鑫,于涛,曲广淼..苯乙烯的单电子转移活性自由基聚合[J].应用化学,2011,28(9):999-1005,7.基金项目
国家科技重大专项(2008ZX05011),黑龙江省自然科学基金重点项目(ZJG0507),黑龙江省自然科学基金青年基金(QC08C33)资助项目,黑龙江省研究生创新科研资金(YJSCX2008-044HIJ) （2008ZX05011）
