论文部分内容阅读
采用活性阴离子聚合方法 ,以不同分子量的聚氧化丙烯为引发剂合成了不同分子量的聚 (γ -苯甲酯 -L -谷氨酸 )嵌段共聚物 ,并用1H -NMR、IR和偏光显微镜等方法对共聚物进行了表征。结果表明 :在1 ,1 ,2 ,2 -四氯乙烷中 ,当溶液浓度一定时 ,聚 (γ-苯甲酯 -L-谷氨酸 )嵌段共聚物呈现出胆甾型液晶的性质。温度升高时 ,聚 (γ-苯甲酯 -L -谷氨酸 )共聚物的液晶相溶液发生相转变行为 ,并且其液晶相稳定性低于相同分子量的聚 (γ -苯甲酯 -L-谷氨酸 )。这与利用Flory -Matheson的构象可变液晶分子理论模型的计算结果相一致。
Poly (γ - benzyl ester - L - glutamic acid) block copolymers with different molecular weight were synthesized by living anionic polymerization using polyoxypropylene with different molecular weight. 1H - NMR, IR and polarized light microscopy Methods The copolymer was characterized. The results show that the poly (γ - benzyl ester - L - glutamic acid) block copolymer shows the properties of cholesteric liquid crystal in 1, 1,2, 2 - tetrachloroethane when the solution concentration is constant . When the temperature is increased, the liquid crystal phase of poly (γ-benzyl ester-L-glutamic acid) copolymer undergoes phase transition behavior and its liquid crystal phase stability is lower than poly (γ-benzyl ester -L - glutamic acid). This is in agreement with the calculated results using Flory-Matheson’s theoretical model of a conformationally variable liquid crystal molecule.