| Effect of Molecular Weight on Liquid Crystal Photoalignment by Photosensitive Polyester Containing Thrifluoromethyl Moieties |
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| 作者姓名： | 费春红 彭增辉 吕凤珍 张伶莉 姚丽双 宣丽 |
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| 作者单位： | [1]State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033 [2]Graduate School of the Chinese Academy of Sciences, Beijing 100049 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant Nos 60277033 and 50473040, and the Science Foundation of Jilin Province under Grant Nos 20020603 and 20050520. |
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| 摘 要： | We investigate the liquid-crystal （LC） alignment direction on photoalignment films formed from photosensitive polyester containing thrifluoromethyl moieties （PPDA） with various molecular weights by crossed polarized optical microscopy. It is found that LC alignment behaviour changes with molecular weight of PPDA. The LC alignment on PPDA irradiated films with the highest molecular weight is homogeneous, while those with low and intermediate molecular weights are homeotropic. However, surface morphologies show weak dependence on molecular weight. The surfaces are smooth and there is no clear morphological anisotropy on these aligned films observed by an atomic force microscope. The surface energies of the irradiated films are also measured by using an indirect contact-angle method where both surface energy and its polar component, increase with increasing molecular weight. Different polar surface energies can be considered as a main reason for different alignment characteristics.
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| 关 键 词： | 分子量效应 液晶 感光性 聚酯 光显微术 |
| 收稿时间： | 2006-07-26 |
| 修稿时间： | 2006-07-26 |
Effect of Molecular Weight on Liquid Crystal Photoalignment by Photosensitive Polyester Containing Thrifluoromethyl Moieties |
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| FEI Chun-Hong, PENG Zeng-Hui, LV Feng-Zhen, ZHANG Ling-Li,YAO Li-Shuang, XUAN Li.Effect of Molecular Weight on Liquid Crystal Photoalignment by Photosensitive Polyester Containing Thrifluoromethyl Moieties[J].Chinese Physics Letters,2006,23(11):3029-3032. |
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| Authors: | FEI Chun-Hong PENG Zeng-Hui LV Feng-Zhen ZHANG Ling-Li YAO Li-Shuang XUAN Li |
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| Affiliation: | 1. State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033 ; 2.Graduate School of the Chinese Academy of Sciences, Beijing 100049 |
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