Stability of azobenzene-containing polyimide film to UV light

Kiyoaki Usami, Kenji Sakamoto, Yoichi Uehara, Sukekatsu Ushioda

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


We have investigated the stability of an azobenzene-containing polyimide (Azo-PI) film with anisotropic molecular orientation to linearly polarized light (LP-L) of wavelength 340-500 nm. The anisotropic molecular orientation was induced by exposing the corresponding polyamic acid film to LP-L of 72J/cm 2, and then the film was thermally imidized. No significant change was observed in the in-plane molecular order of the Azo-PI film over prolonged light exposure of 468J/cm2, but a 10% decrease of the number of the Azo-PI backbone structure was observed. From these results we found that: (i) the reorientation of the backbone structure through photo-isomerization cycles of azobenzene is inhibited in the Azo-PI film; (ii) the photo-decomposition of the Azo-PI film proceeds with about 2 times the rate for a poly[4,4′- oxydiphenylenepyromellitimide] film.

Original languageEnglish
Pages (from-to)6703-6705
Number of pages3
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number9 A
Publication statusPublished - 2005 Sept 8
Externally publishedYes


  • Alignment film
  • Azobenzene
  • Infrared absorption
  • Liquid crystal
  • Molecular orientation
  • Photo-induced alignment
  • Photo-isomerization
  • Polyimide
  • Stability
  • Ultraviolet light

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


Dive into the research topics of 'Stability of azobenzene-containing polyimide film to UV light'. Together they form a unique fingerprint.

Cite this