一种新型的氢键自组装液晶光控取向膜  

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

作　　者：吕凤珍[1,2] 彭增辉[1] 张伶莉[3] 姚丽双[1,2] 刘艳[1,2] 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,长春130033 [2]中国科学院研究生院,北京100039 [3]哈尔滨工业大学理学院物理系,哈尔滨150001

出　　处：《物理化学学报》2009年第2期273-277,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(60736042,60578035,50703039);吉林省与中国科学院科技合作项目(2008YHZ0005)资助项目

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.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 uniform and stable alignment results.

关 键 词：液晶 光控取向 自组装多层膜 线性偏振紫外光 氢键 

分 类 号：O484[理学—固体物理]