Effects of molecular weight on liquid-crystalline behavior of a mesogen-jacketed liquid crystal polymer synthesized by atom transfer radical polymerization
Effects of molecular weight on liquid-crystalline behavior of a mesogen-jacketed liquid crystal polymer synthesized by atom transfer radical polymerization
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DOI：
10.1016/s0032-3861(02)00019-8
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发表时间：
2002-04
期刊：
影响因子：
4.6
通讯作者：
Hailiang Zhang;Zhenning Yu;X. Wan;Qifeng Zhou;E. Woo
中科院分区：
文献类型：
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作者：
Hailiang Zhang;Zhenning Yu;X. Wan;Qifeng Zhou;E. Woo
采用原子转移自由基聚合法，以溴代十六烷基三甲基溴化铵为引发剂，CuBr/金雀花碱为催化剂，在甲氧基苯溶液中合成了不同分子量、低分散性的聚{2，5-双[（4-甲氧基苯基）氧羰基]苯乙烯}（PMPCS）。发现整个聚合过程中活性中心的浓度是恒定的。用DSC和POM研究了Mn在3800 ~ 17400 g/mol范围内的聚合物的液晶行为。只有Mn超过10，200 g/mol的聚合物才形成液晶相，该液晶相是相当稳定的，具有高的清亮点（高于聚合物的分解温度）。
The synthesis of poly{2,5-bis[(4-methoxyphenyl)oxycarbonyl]styrene} (PMPCS) with different molecular weight and low polydispersity was achieved by atom transfer radical polymerization in methoxybenzene solution using 1-bromoethylbenzene as an initiator and CuBr/sparteine complex as a catalyst. The concentration of the living centers throughout the polymerization was found to be constant. The liquid-crystalline behavior of the polymers with Mnranging from 3800 to 17,400g/mol was studied using DSC and POM. Only the polymers with Mnbeyond 10,200g/mol formed a liquid-crystalline phase, which was quite stable with a high clearing point (higher than the decomposition temperature of the polymer).