Abstract：The polymer stabilized liquid crystal (PSLC) film is a relatively novel electro-optical material, which is generally obtained by dissolving a small amount of a bifunctional photoreactive monomer in a low molecular mass liquid crystal. In this paper, the PSLC films were prepared with photoreactive biphenyl methacrylate monomers by photopolymerization induced phase separation. The effects of liquid crystal concentration, curing time, monomer structures and alignment layer on the electro-optical properties of PSLC films were investigated. The results show that the transmittance in the OFF state (TOFF) increased with the liquid crystal concentration, but the driving voltage decreased. TOFF was also influenced by the curing time. Furthermore, when polyimide was used as alignment layer, the films prepared from the bifunctional monomer shows a higher TOFF, while those from the single functional monomer exhibited a deformed electro-optical curve due to the unsteady polymer networks.
出版日期: 2008-09-05
引用本文:
. Effect of polymer structures on electro-optical
properties of polymer stabilized liquid crystal films[J]. Frontiers of Chemical Engineering in China - Selected Publications from Chinese Universities, 2008, 2(3): 265-268.
WANG Shoulian, HE Jie, ZENG Yu, YAN Bin, WANG Yinghan. Effect of polymer structures on electro-optical
properties of polymer stabilized liquid crystal films. Front. Chem. Sci. Eng., 2008, 2(3): 265-268.
Hikmet R A M . Electrically induced light scattering from anisotropic gels. J Appl Phys, 1990, 68: 4406–4412. doi:10.1063/1.346190
2
Du F, Gauza S, Wu S T . Influence of curing temperature and high birefringenceon the properties of polmer-stabilized liquid crystals. Opt Exp, 2003, 11: 2891–2896
Ma J, Liu Y G, Song J, Peng Z H, Ruan S P, Xuan L . Thepreparation and study of polymer network stabilized liquid crystalfilm. Chinese Journal of Light Scattering, 2005, 16: 374–378 (in Chinese)
5
Wang Q B, Ling Z H, Li H F, Huang X M . Study ofthe morphology of polymer network form in liquid crystal. Chinese Journal of Liquid Crystals and Displays, 1999, 14: 94–104 (in Chinese)
He J, Yan B, Yu B Y, Wang S L, Wang X A, Wang J, Zeng Y, Ran R, Wang Y H . Fine adjustmentof network in polymer network liquid crystal film employing RAFT polymerization. J Polym Sci: Part A: Polym Chem, 2008, 46: 3140–3144. doi:10.1002/pola.22623
8
Macchione M, Cupelli D, Filpo G D, Nicoletta F P, Chidichimo G . Rough surfaces for orientationcontrol in reverse mode polymer dispersed liquid crystal films. Liq Cryst, 2000, 27: 917–920. doi:10.1080/02678290050043860
9
Dierking I . Relationshipbetween the electro-optic performance of polymer-stabilized liquid-crystaldevices and the fractal dimension of their network morphology. Adv Mater, 2003, 15: 152–156. doi:10.1002/adma.200390032
10
Sesha Sainath A V, Kameswara Rao A, Rami Reddy A V . Synthesis, characterization and liquid crystalline propertiesof polyacrylates and polymethacrylates containing aryl ester pendantUnit. J Appl Polym Sci, 2000, 75: 465–474. doi:10.1002/(SICI)1097‐4628(20000124)75:4<465::AID‐APP1>3.0.CO;2‐2
11
Dierking I, Kasbar L L, Afzali-Ardakani A, Lowe A C, Held G A . Network morphology of polymerstabilized liquid crystals. Appl Phys Lett, 1997, 71: 2454–2456. doi:10.1063/1.120087
12
Yang D K, Chien L C, Doane J W . Cholesteric liquid crystal/polymer dispersion for haze-freelight shutters. Appl Phys Lett, 1992, 60: 3102–3104. doi:10.1063/1.106765
13
Rajaram C V, Hudson S D, Chien L C . Morphology of diacrylate copolymer networks formed inliquid crystalline media. Polymer, 1998, 39: 5315–5319. doi:10.1016/S0032‐3861(97)10084‐2
14
Chen T J, Chen Y F, Sun C H, Wu J J . Electro-opticalproperties of reverse-mode films of planar aligned polymer-dispersedliquid crystal. J Polym Res, 2006, 13: 85–89. doi:10.1007/s10965‐005‐9001‐2
