引用本文:
吕凤珍, 彭增辉, 张伶莉, 姚丽双, 刘艳, 宣丽. 一种新型的氢键自组装液晶光控取向膜[J]. 物理化学学报,
2009, 25(02): 273-277.
doi:
10.3866/PKU.WHXB20090213
Citation: LV Feng-Zhen, PENG Zeng-Hui, ZHANG Ling-Li, YAO Li-Shuang, LIU Yan, XUAN Li. A New Type of Hydrogen-Bonded LBL Photoalignment Film for Liquid Crystal[J]. Acta Physico-Chimica Sinica, 2009, 25(02): 273-277. doi: 10.3866/PKU.WHXB20090213
Citation: LV Feng-Zhen, PENG Zeng-Hui, ZHANG Ling-Li, YAO Li-Shuang, LIU Yan, XUAN Li. A New Type of Hydrogen-Bonded LBL Photoalignment Film for Liquid Crystal[J]. Acta Physico-Chimica Sinica, 2009, 25(02): 273-277. doi: 10.3866/PKU.WHXB20090213
一种新型的氢键自组装液晶光控取向膜
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.
English
A New Type of Hydrogen-Bonded LBL Photoalignment Film for Liquid Crystal
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.
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