含氟席夫碱型环氧液晶聚合物的合成与表征  

Synthesis and Characterization of Schiff Base Liquid Crystalline Polymers Containing Fluorine and Epoxy Group

作　　者：李泽宇[1] 丛越华[1] 张晓东[1] 陈非[1] 张宝砚[1] 

机构地区：[1]东北大学分子科学与工程中心,辽宁沈阳110004

出　　处：《高分子材料科学与工程》2017年第6期48-52,59,共6页Polymer Materials Science & Engineering

基　　金：国家"973"计划项目(613159)

摘　　要：合成了席夫碱型含氟液晶单体(4-烯丙氧基苯甲酸)-2-甲氧基-4-三氟甲氧基苯胺亚甲基-苯酯(M)和环氧液晶单体(4-烯丙氧基苯甲酸)-4-(2,3-环氧丙氧基)-苯酯(E),将它们接枝共聚到含氢聚硅氧烷上,得到系列含氟席夫碱型环氧液晶聚合物PI^PVI。采用红外光谱、核磁共振、差示扫描量热、热重分析、偏光显微镜和X射线衍射等手段对单体及聚合物的结构和液晶性能进行表征。结果表明,聚合物PI^PVI呈现向列相。从PI到PVI随着单体M含量的减少,聚合物玻璃化转变温度(T_g)和清亮点(T_i)均呈下降趋势。该系列聚合物热稳定性良好,液晶区间在36.4~177.5℃之间。The fluorinated Schiff base monomer （E）-2-methoxy-4-（（（4-（trifluoromethoxy）-phenyl）imino）-methyl）phenyl-4-（allyloxy）benzoate （M） and epoxy monomer 4-（cyclopropylmethoxy）phenyl-4-（allyloxy）benzoate （E） were synthesized and a series of polymers PI～PVI were prepared by graft polymerization of M and N using polymethylhydrosiloxane as backbone. Their chemical structures and mesomorphic phase behavior were investigated by FT-IR, 1H-NMR, DSC, TGA, POM and X-ray. The results show that polymers PI～PVI present nematic phase. With the decreasing content of M in the polymer systems, both the glass transition temperatures and clearing point decrease. The mesomorphic temperature ranges are 36.4～177.5 ℃, which reveal that PI～PVI have high themal stability and remarkable liquid crystal properties.

关 键 词：含氟液晶 席夫碱 环氧 聚硅氧烷 

分 类 号：O634.41[理学—高分子化学]