Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (02): 273-277.doi: 10.3866/PKU.WHXB20090213

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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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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