物理化学学报 >> 2009, Vol. 25 >> Issue (02): 273-277.doi: 10.3866/PKU.WHXB20090213

研究论文 上一篇    下一篇

一种新型的氢键自组装液晶光控取向膜

吕凤珍; 彭增辉; 张伶莉; 姚丽双; 刘艳; 宣丽   

  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, 长春 130033; 中国科学院研究生院, 北京 100039; 哈尔滨工业大学理学院物理系, 哈尔滨 150001
  • 收稿日期:2008-09-05 修回日期:2008-10-27 发布日期:2009-01-16
  • 通讯作者: 宣丽 E-mail:xuanli@ciomp.ac.cn

A New Type of Hydrogen-Bonded LBL Photoalignment Film for Liquid Crystal

LV Feng-Zhen; PENG Zeng-Hui; ZHANG Ling-Li; YAO Li-Shuang; LIU Yan; XUAN Li   

  1. State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China; Graduate School of the Chinese Academy of Sciences, Beijing 100039, P. R. China; Department of Physics, College of Science, Harbin Institute of Technology, Harbin 150001, P. R. China
  • Received:2008-09-05 Revised:2008-10-27 Published:2009-01-16
  • Contact: XUAN Li E-mail:xuanli@ciomp.ac.cn

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摘要： 报道了一种新型的以氢键为驱动力的液晶自组装光控取向膜, 研究了薄膜的制备方法与光敏特性. 通过聚(4-乙烯基吡啶)中的吡啶基团与光敏聚丙烯酰氧基肉桂酸间的氢键作用制备了LBL(layer-by-layer)型的自组装多层膜, 制备过程的紫外-可见光谱表明, 该组装过程为逐层、均匀沉积过程. 傅里叶变换红外光谱表明, 多层膜的成膜驱动力为氢键. 用线性偏振紫外光辐照该薄膜, 多层膜中与光矢量方向匹配的光敏基团发生[2+2]环加成反应, 形成表面张力各向异性的薄膜. 用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.

关键词: 液晶, 光控取向, 自组装多层膜, 线性偏振紫外光, 氢键

Abstract: A new type of hydrogen-bonded layer-by-layer (LBL) photoalignment film was fabricated and studied. The photosensitive hydrogen donor containing cinnamoyl groups (Poly(4-acryloyloxy)-cinnamic acid, PCA) was self-assembled with hydrogen accepter poly (4-vinylpyridine) (PVPy) in an organic solvent. Then a hydrogen-bonding-directed ultrathin film was formed. The uniformity and linear growth of the deposition procedure was proven by UV-Vis spectra and the interaction between PVPy and PCA was identified as hydrogen bonding using FT-IR spectroscopy. When linearly polarized ultraviolet light (LPUVL) irradiated the multilayer film, only the photosensitive double bond parallel to the polarization direction of LPUVL could be polymerized via [2+2] cycloaddition. After the irradiation an anisotropic film was prepared, and we used this anisotropic film as an alignment layer of nematic liquid crystals, and obtained uniformand stable alignment results.

Key words: Liquid crystal, Photoalignment, Self-assembled multilayer, Linearly polarized ultra-violet light, Hydrogen-bond