ATRP体系下一种聚甲基丙烯酸酯侧链型液晶的合成及表征  

Synthesis and Characterization of a Novel Side-Chain Liquid Crystalline Methacrylic Polymer under ATRP Conditions

作　　者：张海良[1] 邵志美[1] 钟冠群[1] 

机构地区：[1]湘潭大学化学学院,湖南湘潭411105

出　　处：《湘潭大学自然科学学报》2008年第3期80-85,共6页Natural Science Journal of Xiangtan University

基　　金：湖南省杰出青年科学基金资助项目(05JJ10003);教育部"新世纪优秀人才支持计划"资助项目(NCET-05-0707)

摘　　要：以α-溴代异丁酸乙酯(EBB)为引发剂,CuBr/2,2′-联二吡啶(bpy)为催化体系,采用原子转移自由基聚合(AT-RP)方法制得了一系列分子量可控且分子量分布较窄的含联苯基团的聚甲基丙烯酸酯侧链液晶聚合物,通过1H NMR、GPC、DSC、POM、WXRD等对其进行了表征.研究结果表明:聚合物呈现三个相转变,分别为玻璃化转变、近晶E向近晶A转变及近晶A向各向同性转变;随着聚合物分子量的增大,其相应的相转变温度均有所提高.A side-chain liquid crystalline polymethacrylate, containing biphenyl as the mesogen, with different molecular weight and low polydispersities, was synthesized by atom transfer radical polymerization （ATRP）, using ethyl 2-bromoisobutyrate （EBB） as initiator and CuBr/bpy as catalyst. Its structure and properties were characterized by ^1H NMR, GPC, DSC, POM, WXRD, et al. The result shows that this polymer has two Smetic phases （SmA,SmE） in addtion to isotropic phase, and a smectic A liquid crystalline phase to isotropic phase transition, and these phase transitional temperatures of polymers increase somewhat with the increase of the molecular weight.

关 键 词：原子转移自由基聚合 聚甲基丙烯酸酯 侧链液晶高分子 近晶相 

分 类 号：O633.2[理学—高分子化学]