Phase Behavior and Dynamics for Side-chain Liquid Crystal Polymer Having a Cyanobiphenyl Mesogen

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Other Title
  • シアノビフェニル基をメソゲンに有する側鎖型液晶高分子の相転移挙動とダイナミクス

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Description

We examined the molecular weight dependence of phase transition behavior for poly(6-[4-(4'-cyanophenyl) phonoxy] hexyl acrylate) prepared by ATRP, which shows reentrant polymorphism with the variation of degree of polymerization (Dp). For the samples with moderate molecular weight (Mn 7,900~20,000) nematic, smectic A and reentrant nematic (RN) phase were exhibited whereas that with higher molecular weight only nematic phase was observed. Furthermore, the difference of dynamics in these two nematic phase has been confirmed by dynamic light scattering (DLS) measurements. The two types of nematic phase is found to be definitely distinguished each other with the two characteristics. This result is ascribed to that the increasing of dimerized mesogen acting as physically linking agents of polymer chains. On the basis of the knowledge, the direct RN-N transition is strongly suggested by DLS measurement for the samples with higher molecular weight.

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Details 詳細情報について

  • CRID
    1390282680663584768
  • NII Article ID
    110004615403
  • NII Book ID
    AA11639022
  • DOI
    10.11538/ekitou.2004.0.199.0
  • ISSN
    24325988
    18803490
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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