文献类型：期刊文献

英文题名：R-RAFT approach for the polymerization of N-isopropylacrylamide with a star poly(e-caprolactone) core

作者：Bian, Qingqing[1];Xiao, Yan[1];Lang, Meidong[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat, Minist Educ,Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2012

卷号：50

期号：3

起止页码：571

外文期刊名：JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000298479800018)】；

基金：This research was supported by the Fundamental Research Funds for the Central Universities (WD0913008, WD1014017), "Shu Guang'' Project of Shanghai Municipal Education Commission, the Natural Science Foundation of Shanghai (11ZR1409200), the National Natural Science Foundation of China (51103041), Shanghai Leading Academic Discipline Project (B502), Shanghai Key Laboratory Project (08DZ2230500), and Changjiang Scholars and Innovative Research Team in University (IRT0825).

语种：英文

外文关键词：kinetics (polym; ); reversible addition fragmentation chain transfer (RAFT); ring-opening polymerization; star polymers

摘要：Reversible addition-fragmentation chain transfer (RAFT) polymerization is a more robust and versatile approach than other living free radical polymerization methods, providing a reactive thiocarbonylthio end group. A series of well-defined star diblock [poly(e-caprolactone)-b-poly(N-isopropylacrylamide)]4 (SPCLNIP) copolymers were synthesized by R-RAFT polymerization of N-isopropylacrylamide (NIPAAm) using [PCL-DDAT]4 (SPCL-DDAT) as a star macro-RAFT agent (DDAT: S-1-dodecyl-S'-(a, a'-dimethyl-a?-acetic acid) trithiocarbonate). The R-RAFT polymerization showed a controlled/living character, proceeding with pseudo-first-order kinetics. All these star polymers with different molecular weights exhibited narrow molecular weight distributions of less than 1.2. The effect of polymerization temperature and molecular weight of the star macro-RAFT agent on the polymerization kinetics of NIPAAm monomers was also addressed. Hardly any radicalradical coupling by-products were detected, while linear side products were kept to a minimum by careful control over polymerization conditions. The trithiocarbonate groups were transferred to polymer chain ends by R-RAFT polymerization, providing potential possibility of further modification by thiocarbonylthio chemistry. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 571-580, 2012