Photochemical behavior and the ability to control liquid crystal alignment of polymethacrylates with styrylpyridine side chains

Shigeru Yamaki, Masaru Nakagawa, Shin'ya Morino, Kunihiro Ichimura

研究成果: Article査読

19 被引用数 (Scopus)

抄録

Photoproduct distribution of styrylpyridine (SP) side chains tethered to polymethacrylate backbones upon irradiation with 313 nm light was analyzed UV-spectroscopically in solutions and films of a homopolymer and copolymers of 2-[2-(4-methacryloxyphenyl)ethenyl]pyridine. Whereas E-to-Z photoisomerization of SP moieties proceeds in solution, followed by the slow oxidative photocyclization to give an azaphenanthrene, the predominant photochemistry in films consists of photodimerization and E-to-Z photoisomerization. Irradiation of films of the SP-polymers with linearly polarized 313 nm light generated dichroism of the chromophores due to the axis-selective consumption of the E-isomer. Exposing films of SP-polymers to relatively lower doses of linearly polarized light induced homogeneous alignment of a nematic liquid crystal with a perpendicular orientation with respect to the polarization plane of the light. The photoalignment was thermally stabilized by efficient photodimerization leading to crosslinked structures. However, prolonged irradiation with the polarized light deteriorated the photoalignment. On the basis of these results, it is concluded that the homogeneous photoalignment is determined by remaining E-isomers whereas the photodimerization yielding crosslinks enhances the thermal stability of the alignment.

本文言語English
ページ(範囲)325-334
ページ数10
ジャーナルMacromolecular Chemistry and Physics
202
2
DOI
出版ステータスPublished - 2001 2 8
外部発表はい

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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