Shear Flow Orientation of Cylindrical Microdomain in Liquid Crystalline Diblock Copolymer and its Potentiality as Anchoring Substrate for Nematic Mesogens
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概要
- 論文の詳細を見る
We prepared a diblock copolymer composed of polystyrene (PS) and side-chain liquid crystal polymer (LCP) by atom transfer radical polymerization. The weight fraction of the PS segment is 0.22, resulting in a microsegregated structure with PS cylinders hexagonally packed in a matrix of LCP, which forms smectic A, nematic and isotropic phases in order of increasing temperature. Shear flow at nematic temperatures orients well the PS microcylinders, as well as the nematic mesogens of the LCP in the velocity direction. A high degree of orientation of 0.95 is attained for microcylinders while the orientational order parameter of the nematic LC is around 0.5. Interestingly, the nematic LC mesogens recover their initial orientation upon cooling after they have lost the orientational order in the isotropic melt. This spontaneous orientation shows that PS cylinders whose orientation is strongly sustained with a temperature variation acts as an anchoring substrate for the nematic mesogens.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2006-12-15
著者
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Tokita Masatoshi
Department Of Organic And Polymer Materials Chemistry Tokyo Institute Of Technology
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Adachi Mitsu-aki
Department Of Organic And Polymeric Materials Tokyo Institute Of Technology
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Takazawa Fumihiro
Department Of Organic And Polymeric Materials Tokyo Institute Of Technology
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Watanabe Junji
Department Of Applied Chemistry Graduate School Of Engineering Osaka University
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Adachi Mitsu-aki
Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
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Takazawa Fumihiro
Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
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