Molecular Weight Dependence of Phase Behavior in Side-Chain Liquid Crystalline Polymer Which Exhibits Reentrant Nematic Phase
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概要
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We prepared poly(6-[4-(4'-cyanophenyl)phenoxy]hexyl acrylate)s with various molecular weights ($M_{\text{n}}$) and narrow molecular weight distributions, and examined the $M_{\text{n}}$ dependence of phase behavior which includes the reentrant nematic (RN) phase. Polymers with $M_{\text{n}}$ lower than 20,000 form nematic (N), smectic A (SmA) and RN phases as temperature decreases, while ones with $M_{\text{n}}$ higher than 20,000 form only N phase. The disappearance of SmA in longer chains is caused by the decrease in N-SmA temperature and the increase of SmA-RN one with increasing $M_{\text{n}}$. Result indicates that the polymer length is one of the significant factors affecting the reentrant behavior in side-chain liquid crystalline (LC) polymers.
- 2005-03-10
著者
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Okazaki Yusuke
Department Of Applied Chemistry Faculty Of Engineering Osaka University
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Tomikawa Naoki
Department Of Organic And Polymeric Materials Tokyo Institute Of Technology
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Itoh Tomomichi
Department Of Material Science And Biotechnology Graduate School Of Science And Engineering Venture
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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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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, 2-12-1 Ookayama, Meguro, Tokyo 152-8552, Japan
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Watanabe Junji
Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8552, Japan
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Tokita Masatoshi
Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8552, Japan
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Tomikawa Naoki
Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8552, Japan
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Okazaki Yusuke
Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8552, Japan
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Itoh Tomomichi
Department of Chemistry, University of Aberdeen
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Itoh Tomomichi
Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8552, Japan
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