一种新型耐热可溶聚酰亚胺的制备及性质  

Synthesis and properties of novel heat-resistant,soluble polyimide

作　　者：张恒[1] 邵磊山[1] 龚世铭 龚庆[1] 汪映寒[1] 

机构地区：[1]四川大学高分子科学与工程学院高分子材料与工程国家重点实验室,四川成都610065

出　　处：《液晶与显示》2016年第3期258-264,共7页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.51173115);博士点基金(No.20110181110030)~~

摘　　要：成功合成带有三苯胺和吡喃环结构的新型功能性二胺4-[（2-二氢吡喃）氧]-4’,4＂-二氨基三苯胺（THP）。使用此单体与4,4′-二氨基二苯醚（ODA）和4,4′-（六氟异丙烯）二酞酸酐（6FDA）共聚,利用两步化学酰胺化法,制备了共聚物的组成配比不同的3种聚酰亚胺（PI）。使用NMR、FT-IR、DSC、UV-Vis等测试手段对单体和PI进行了结构表征和各项性能测试。研究了其溶解性能、耐热性能、透光性能和取向性能。结果表明3种PI均可溶于NMP、DMF等极性溶剂,同时在THF、DCM等低沸点溶剂中也具有较好的溶解性。PI的玻璃化转变温度在270℃以上,在500~800nm区域透过率在80%以上,液晶分子的预倾角随THP的增加而增大,可达2.3°,且具有均一的取向效果。The diamine 4-（（（tetrahydro-2H-pyran-2-yl）oxy）methyl）-4′,4″-diaminotriphenylamine（THP）containing triphenylamine group and pyran ring was successfully prepared.A series of polyimides（PIs）were synthesized with the copolymerization of THP,4,4′-Oxydianiline（ODA）,4,4′-（hexafluoroisopropylidene）diphthalic anhydride（6FDA）by chemical imidization.The structures and properties of the PIs were characterized by NMR,FT-IR,DSC,and UV-Vis etc.It was found that all PIs were soluble in polar solvents,such as N-methylpyrrolidone（NMP）and N,N-dimethylformamide（DMF）and even soluble in some common organic solvent with low boiling point such as Tetrahydrofuran（THF）and Trichloromethane（DCM）.The glass transition temperature（Tg）of the PIs was above 270℃,and their transmittance in 500~800nm wavelengths was more than 80%.It can be observed under POM that the liquid crystal could be aligned uniformly and a pretilt angle of about 2.3°can be obtained by using the PI films as liquid crystal alignment layer.

关 键 词：聚酰亚胺 可溶性 耐热性 液晶取向剂 预倾角 

分 类 号：O633.4[理学—高分子化学]