Influence of structures of polymer backbones on cooperative photoreorientation behavior of p-cyanoazobenzene side chains

Mina Han, Masatoshi Kidowaki, Kunihiro Ichimura, P. S. Ramanujam, Søren Hvilsted

研究成果: Article査読

21 被引用数 (Scopus)

抄録

Photoinduced orientational behavior of a polymethacrylate (CN6) and a polyester (p6a12) with p-cyanoazobenzene side chains was studied to reveal the structural effect of the liquid crystalline polymer backbones. Irradiation with linearly polarized UV light resulted in the reorientation of the azobenzene for both polymers toward the direction perpendicular to the electric vector of the incident light. The induced orientation can be slowly amplified by thermal Z-to-E isomerization and be facilitated by irradiation with visible light. For p6a12 with the long alkylene and carbonyl groups in main-chain cooperative orientation of main chains with p-cyanoazobenzene side chains was confirmed using FT-IR spectroscopy, contrary to the case of CN6. Furthermore, in-situ observation of changes in photoinduced birefringence by ellipsometry revealed that thermal treatment plays a significant role in levels of molecular orientation in polymer matrices.

本文言語English
ページ(範囲)4256-4262
ページ数7
ジャーナルMacromolecules
34
12
DOI
出版ステータスPublished - 2001 6 5
外部発表はい

ASJC Scopus subject areas

  • 有機化学
  • ポリマーおよびプラスチック
  • 無機化学
  • 材料化学

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