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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 shu

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

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 Date: 5 September 2008
Available Online: 16 December 2008

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.
- Liquid crystal; Photoalignment; Self-assembled multilayer; Linearly polarized ultra-violet light; Hydrogen-bond
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