文献类型：期刊文献

中文题名：NMP与ROP相结合制备PCL-b-PSt共聚物及其性能研究

英文题名：Synthesis and Properties of PCL-b-PSt Copolymer Prepared from the Combination of Nitroxide-Mediated Radical Polymerization and Ring-Opening Polymerization

作者：李翠珍[1,2];刘建静[1];张琰[1];郎美东[1]

机构：[1]华东理工大学材料科学与工程学院,超细材料制备与应用教育部重点实验室,上海200237;[2]东华理工大学材料系,江西抚州344000

年份：2011

卷号：24

期号：3

起止页码：225

中文期刊名：功能高分子学报

外文期刊名：Journal of Functional Polymers

收录：CSTPCD;;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：中央高校基本科研业务费(WD0913008,WD1014036);国家自然科学基金资助项目(20804015)

语种：中文

中文关键词：氮氧稳定自由基聚合;开环聚合;聚苯乙烯;聚己内酯

外文关键词：nitroxide-mediated radical polymerization; ring-opening polymerization; polystyrene; polycaprolactone

摘要：以4-羟基-2,2,6,6-四甲基哌啶氮氧自由基(HTEMPO)为引发剂,通过ε-己内酯(ε-CL)的开环聚合,合成末端基为氮氧自由基的聚己内酯(PCL-T)。在其调控下,进行过氧化苯甲酰(BPO)引发苯乙烯(St)的自由基聚合,合成结构规整的聚己内酯-b-聚苯乙烯(PCL-b-PSt)共聚物。用氢核磁共振(1H-NMR)、电子自旋共振(ESR)、红外光谱(FT-IR)、凝胶渗透色谱(GPC)和热重分析(TGA)等手段对聚合物的结构和性能进行了研究。结果表明:氮氧自由基的存在不影响ε-CL的开环聚合,异辛酸亚锡(Sn(Oct)2)对ε-CL开环聚合的催化作用也对氮氧自由基无破坏性;在PCL-T的调控下,通过St的聚合可合成结构规整的PCL-b-PSt共聚物,且聚合过程具有"活性"聚合的特征;PCL-b-PSt共聚物的热稳定性高于PCL均聚物的热稳定性。
Poly（ε-caprolactone）-block-polystyrene（PCL-b-PSt） was prepared by nitroxide-mediated radical polymerization of styrene（St） in the presence of PCL with terminated-nitroxide radical group（PCL-T） together with the ring-opening polymerization of ε-CL with 4-hydroxyl-2,2,6,6-tetramethylpiperidinyl-1-oxy（HTEMPO） as initiator.1H-NMR,ESR,FT-IR,GPC and TGA were employed to analyze the structure and properties of the polymers.Results show that the presence of the nitroxide radical has no effect on the ring-opening polymerization of ε-CL.Also,the ring-opening polymerization of ε-CL with Sn（Oct）2 as the catalyst does not destroy the nitroxide radical group.The well-defined PCL-b-PSt copolymers were synthesized through the polymerization of St at the mediation of PCL-T and the mechanism of polymerization of St fulfilled a typical well-controlled polymerization.The thermal stability of PCL-b-PSt copolymer is better than that of PCL homopolymer.