PB36 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(2004年日本液晶学会討論会)

概要

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We examined the molecular weight dependence of phase transition behavior for poly(6-[4-(4'-cyanophenyl) phenoxy] hexyl acrylate) prepared by ATRP, which shows reentrant polymorphism with the variation of degree of polymerization (D_p). For the samples with moderate molecular weight (M_n=7, 900〜20, 000) N, S_mA and reentrant nematic (RN) phase were exhibited whereas that with the highest molecular weight S_mA phase was disappeared and only N phase was observed. Furthermore, the difference of dynamics in these two nematic phase was confirmed by dynamic light scattering (DLS) measurements. The two types of nematic phase were found to be definitely distinguished each other with the relaxation time of fluctuation. This result is ascribed to that the increasing of dimerized mesogen acting as physically linking agents of polymer chains in RN phase. As a result, for the samples with the highest molecular weight the direct RN-N transition is strongly suggested by DLS measurement.
日本液晶学会の論文
2004-09-26