侧链含有两种介晶基元的聚硅氧烷类液晶聚合物的制备与性能  

SYNTHESIS AND CHARACTERIES OF SIDE-CHAIN LIQUID CRYSTALLINE- POLYMETHYLHYDROSILOXANE CONTAINING TWO MESOGENIC UNITS

作　　者：丛越华[1] 张宝砚[1] 贾莹光[1] 王文彬[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162-164,共3页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助课题 (2 9874 0 0 7)

摘　　要：合成了侧基带有两种介晶基元的聚硅氧烷类系列液晶聚合物 (P1～ P5) ,所用介晶单体 M1为 4 -联苯二酚基 - 4′- (2 -乙基己酰基 ) - 4-烯丙氧基苯甲酸酯 ,M2 为 4 -烯丙氧基苯甲酰氧基 - 4′-甲氧基苯 ,它们介晶区间分别为 39℃和 7.9℃。只含有单体 M1的聚合物 P1和只含有单体 M2 的聚合物 P5的介晶区间分别为 70 .8℃和 75 .1℃ ;但是同时含有不同摩尔比的 M1和 M2 的液晶聚合物 P2 ～ P4的介晶区间为 2 4 0～ 2 5 5℃ ,比只含有—种介晶基元的 P1或 P5拓宽了约 170℃ ,所有聚合物均低于室温就有液晶性能 ,且耐热性达 310℃以上 。A series of side chain liquid crystalline polymers containing different mole radio of mesogenic monomers M 1 (4 dihydroxydiphnyl 4′ (2 ethyl-hexanoyl) p allyioxy benzoate) and M 2 (4 allylexybenzoxy-4′ methoxyphenyl) upon to the backbone of polymethylhydrosiloxane(PMHS) were prepared by graft polymerization. The temperature of mesogenic range ( TMR ) of M 1 and M 2 were 39 ℃ and 7.9 ℃. The TMR of P 1 and P 5 only contained M 1 and M 2 were 70.8 ℃ and 75.1 ℃ indevidually. However, the TMR of P 2～P 4 containing M 1 and M 2 were 240 ℃～255 ℃ and increased more than 170 ℃ compared of P 1 and P 5. The T g of P 1～P 5 were lower than room temperture, they exhibited smectic mesogenic textures and tempertures of decomposition (at 5 mass% loss) were more than 310 ℃.

关 键 词：侧链 介晶基元 聚硅氧烷类 液晶聚合物 制备 性能 4-联苯二酚基-4′-(2-乙基已酰基)-4-烯丙氧基苯甲酸酯 合成 

分 类 号：O753.2[理学—晶体学] O634.41