添加剂对聚酰亚胺液晶垂直取向剂性能的影响  

Effect of additive on properties of polyimide liquid crystal vertical alignment film

作　　者：丁紫君[1] 刘明[1] 邵磊山[1] 汪映寒[1] 

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

出　　处：《功能材料》2012年第1期10-13,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50973067,51173115);教育部留学回国人员科研启动基金资助项目(20071108-18-12)

摘　　要：研究了添加剂对PI取向性能、耐摩擦性、热稳定性以及透光率的影响。用均苯四甲酸二酐(PM-DA),对苯二胺(PDA),4-已氧基联苯酚-3’,5’-二胺基苯甲酸酯(C6-BBDA),制备了三元共聚型PI取向膜,并采用添加剂(封端剂和交联剂)对PI改性。通过调节添加剂的组成制备了4种PI。利用红外光谱仪(FT-IR)、热失重分析仪(TGA)、紫外分光光度计(UV-Vis)、偏光显微镜(POM)和预倾角测试仪对合成的PI进行了结构表征和性能测试。研究发现LC分子在4种PI膜上都获得了均匀的垂直取向;添加交联剂的PI膜具有良好的耐摩擦性,经摩擦强度为600mm摩擦后,仍对LC分子具有垂直取向的能力;加入添加剂的PI膜具有良好的热稳定性,此外,加入添加剂的PI膜仍具有较高的透光率。The effect of the additive on alignment property,rubbing-resistance,thermal stabilities and transmittance of PI was investigated.The PI alignment film was prepared by pyromellitic dianhydride（PMDA）,p-phenylenediamine（PDA） and 4-hexyloxy-bip henyl-3＇,5＇2-diaminobenzoate（C6-BBDA）.The PI was modified by the additive（end capping agent and crosslinking agent）.The structures and properties of PI were measured with infrared spectrometer（FT-IR）,thermogravimetric analysis（TGA）,ultra-visible spectrometer,polarized microscopy and pretilt angle tester.It was found that uniform LC vertical alignment was induced by four kinds of PI films.PI film modified with crosslinking agent showed excellent rubbing-resistance and still kept LC vertical alignment after strong rubbing in rubbing strength as 600mm.PI films with the additives possessed good thermal stabilities.Moreover,PI films with the additives had high transmittance.

关 键 词：聚酰亚胺 垂直取向 添加剂 耐摩擦性 热稳定性 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业]