表面自组装反应制备液晶光控取向膜  

Preparation of Photosensitive Self-Assembled Monolayer Film Used as Photoalignment Film of Nematic Liquid Crystal

作　　者：吕凤珍[1] 彭增辉[1] 姚丽双[1] 张伶莉[1] 刘艳[1] 宣丽[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室

出　　处：《液晶与显示》2008年第4期399-403,共5页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No50473040,No60578035,No50703039);吉林省科技厅基金(No20050520,No20050321-2)资助项目

摘　　要：通过聚乙烯醇薄膜表面致密的羟基基团与肉桂酰氯间的选择性酯化反应,将光敏基团连接到聚乙烯醇薄膜表面,制备出一种新型的光敏自组装单层膜。用线性偏振紫外光辐照该薄膜,与光矢量方向匹配的肉桂酸基团发生光化学反应,反应产物沿辐照光的偏振方向分布,形成表面张力各向异性的薄膜。将该薄膜作为向列相液晶的取向膜制成平行液晶器件,在偏光显微镜下观察,发现获得了均一、稳定的取向效果。这种自组装光控取向膜的制作过程简单,且具有良好的热稳定性。A surface of poly（vinyl alcohol）（PVA） with compact hydroxyl groups was treated with cinnamoyl chloride to achieve surface-selective introduction of the photosensitive groups through surface esterification reaction, then a new type of photosensitive layer-by-layer self-assembled film was prepared. When linearly polarized ultraviolet light irradiated the monolayer film, the photosensitive double bond parallel to the polarization direction could be polymerized via photochemical reaction, and the production of reaction distributed along the polarized direction of the incident LPUV light. Then an anisotropic film was prepared by this method, we used this anisotropic cinnamoyl-modified PVA film as alignment layer of nematic liquid crystals and got a uniform and stable alignment result. The fabrication process of this alignment film is convenient and the alignment film has good thermal stability.

关 键 词：液晶 自组装 光控取向膜 

分 类 号：O753.2[理学—晶体学]