用原子转移自由基聚合方法合成胆甾侧链液晶聚合物

STUDY ON THE PREPARATION AND PROPERTIES OF CHOLESTERIC SIDE CHAIN LIQUID CRYSTAL POLYMER FROM ATRP

以胆固醇氯甲酸酯和丙烯酸羟乙酯为原料,合成了丙烯酸羟乙酯基胆甾醇碳酸酯(简称GMCC),作为一种含液晶基元的单体,使之在苯甲醚溶液中在Ebib/CuBr/MA5-DETA催化系统下进行原子转移自由基聚合(ATRP)。动力学分析表明,转化率随着反应时间呈线性增加,Ln[M]0/[M]与反应时间呈良好线性关系,反应产物的分子量分布较窄(1.3左右),所得产物可作为大引发剂引发丙烯酸甲(丁)酯通过同样的催化体系,进一步聚合成嵌段共聚物。胆甾侧链液晶聚合物的相转变温度和织构偏光显微镜观察表明,这种聚合物具有良好的液晶性能。

In this paper, a new cholesteric liquid crystalline monomer (GMCC) has been synthesized from cholesteryl chloroformate and glycol monoacrylate. The reaction occurs by means of atom transfer radical polymerization (ATRP) in the anisole. The dynamic analysis indicates that the monomer conversion is increasing along with the reaction time. The molecular weight distribution of the product is narrow (about 1.3). The block acrylic copolymer polymer can be synthesized with ATRP initiated by the polymer of cholesteric liquid crystalline monomer. The phase transition temperature and the texture of cholesteric liquid crystalline polymers were investigated by polarized microscope. The result indicates that all the polymers have well liquid crystalline capability.