侧链含偶氮基的聚硅氧烷类液晶高分子及其离聚物的合成与表征  

SYNTHESIS AND CHARACTERIZATION OF SIDE-CHAIN LIQUID CRYSTALLINE POLYSILOXANES AND IONOMERS CONTAINING AZO GROUPS

作　　者：邵兵[1] 张宝砚[1] 胡建设[1] 姜同英[1] 

机构地区：[1]东北大学化学系,辽宁沈阳110006

出　　处：《高分子材料科学与工程》2002年第3期70-72,76,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助课题 (5 9173130 )

摘　　要：以 4 -烯丙氧基 - 4′-硝基偶氮苯 (M1)和 4 -烯丙氧基苯甲酸 (M2 )为单体 ,通过与聚硅氧烷接枝聚合 ,合成了一系列聚合物 P ～P 及离聚物 P ～P 。合成的液晶单体、聚合物及离聚物的结构均通过红外或核磁的验证 ,并通过 DSC、偏光显微镜和 X射线衍射研究了其液晶行为 ,聚合物 P ～P 及离聚物 P ～P 均为向列型液晶。液晶基元的含量和离子基元的引入对液晶的玻璃化温度 (Tg)、液晶相范围 (ΔT)等有显著的影响。聚合物 P ～P 随着液晶基元含量的增加 ,其 Tg 从 98.8℃降低到 6 1.9℃ ,相应地 ΔT从 19.8℃拓宽到 4 3.6℃ ;离聚物 P ～P 的液晶行为随着离子含量的增加 ,其清亮点 (Tc)从 16 6 .2℃降低到 134.5℃ ,ΔT也相应地缩短 ,当离子含量达到 4 0 %时 ,离聚物的液晶相消失。The polymers P Ⅰ～P Ⅳ and ionomers P Ⅴ～P Ⅷ were synthesized by graft polymerization using the monomers 4 allyoxy 4′ nitro azobenzene and 4 allyloxy benzoic acid. The chemical structures of the monomers, polymers and ionomers were characterized by FT IR spectra or 1H NMR spectra. The liquid crystalline behaviors of polymers and ionomers were studied by DSC, optical polarizing micrographs and wide angle X ray diffraction. The contents of the mesogenic monomers and the existence of ions have important effects on the glass transition temperature( T g), liquid crystalline ranges(Δ T ), and so on. In P Ⅰ～P Ⅳ , T g decreased from 98.8 ℃ to 61.9 ℃ and Δ T widened from 19.8 ℃ to 43.6 ℃ with increasing the content of mesogenic monomers. In P Ⅴ～P Ⅷ, T g increased from 50.2 ℃ to 77.2 ℃ and the clearing point temperature ( T c) decreased from 166.2 ℃ to 133.5 ℃ with increasing the ionic content.

关 键 词：侧链含偶氮基 聚硅氧烷类 液晶高分子 离聚物 合成 表征 向列型 

分 类 号：O753.2[理学—晶体学] O634.41