Stability of photo-induced alignment of azobenzene-containing polyimides

Kiyoaki Usami, Kenji Sakamoto, Yoichi Uehara, Sukekatsu Ushioda

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We have examined the change in the molecular orientation of the photo-aligned film of polyimide containing azobenzene in the backbone structure (Azo-PI) by a washing treatment. The Azo-PI films were washed in 2-propanol with an ultrasonic cleaner for 5 min and then in pure water for 5 min. No noticeable change was observed in the in-plane molecular orientation of the photo-aligned Azo-PI films. On the other hand, the in-plane molecular orientation of a rubbed polyimide (poly[4,4'-oxydiphenylene-1,2,3,4-cyclobutanetetracarboximide]) film was relaxed by washing. From these results we conclude that the molecular orientation of the photo-aligned Azo-PI films is more stable than that of the rubbed polyimide film.

Original languageEnglish
Pages (from-to)227/[1791]-236[1800]
JournalMolecular crystals and liquid crystals
Volume438
DOIs
Publication statusPublished - 2005

Keywords

  • Azobenzene
  • Photo-induced alignment
  • Photo-isomerization
  • Polyimide
  • Stability of molecular orientation

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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