稳定自由基存在下苯乙烯聚合分子量的控制  

The Control of Styrene Polymerization Molecular Weight Mediated by TEMPO

作　　者：郑淑英 

机构地区：[1]宁德师范专科学校化学系,福建宁德352100

出　　处：《吉首大学学报（自然科学版）》2002年第3期82-84,93,共4页Journal of Jishou University(Natural Sciences Edition)

基　　金：固体表面物理化学国家重点实验室基金资助项目 (1130 )

摘　　要：在少量联吡啶存在下 ,苯乙烯在稳定自由基TEMPO作用下的聚合 ,分子量可控 ,分子量分布窄 ,具有活性聚合特征 .联吡啶与TEMPO的物质的量比在 2∶1时控制聚合效果好 ,135℃为体系较理想的聚合温度 .1 HNMR研究表明联吡啶可以提高控制苯乙烯活性聚合的分子量 .Styrene polymerization mediated by TEMPO was distinctly accelerated by the addition of small amounts of 2,2'-bipyridine(bpy). The polymerization proceeded in a living fashion as indicated by the increase in molecular weight with time and conversion and relatively low polydispersities. It was found the polymerization was controlled well when the molar ratio of bpy/TEMPO equaled to 2/1. 135 ℃ was the optimal temperature for this system.1HNMR showed that bpy has a better control on styrene living polymerization.

关 键 词：稳定自由基 苯乙烯 聚合 分子量 联吡啶 聚苯乙烯 

分 类 号：O632.13[理学—高分子化学]