Effect of a chiral dopant on the electro‐optical properties of polymer‐dispersed liquid‐crystal films |
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| Authors: | Wenbo Li Hongxue Zhang Liping Wang Canbin Ouyang Xiaokang Ding Hui Cao Huai Yang |
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| Affiliation: | Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, People's Republic of China |
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| Abstract: | Polymer‐dispersed liquid crystal (PDLC) films were prepared by the ultraviolet‐light‐induced polymerization of photopolymerizable monomers in nematic liquid crystal/monomer/chiral dopant composites, and the effect of the chiral dopant on the electro‐optical properties of the PDLC films was studied. It was demonstrated that the addition of a small amount of the chiral dopant increased the driving voltage somewhat but decreased the turn‐off time significantly. Furthermore, the transmittance of ultraviolet, visible, and near‐infrared light of the off state of PDLC films showing light scattering increased with increasing content of the chiral dopant, and the optimum electro‐optical properties of the PDLC films were obtained when the content of the chiral dopant was not more than 2 wt %. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 |
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| Keywords: | chiral films light scattering optics photopolymerization |
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