Abstract
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 language | English |
|---|---|
| Pages (from-to) | 6703-6705 |
| Number of pages | 3 |
| Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
| Volume | 44 |
| Issue number | 9 A |
| DOIs | |
| Publication status | Published - 2005 Sept 8 |
| Externally published | Yes |
Keywords
- 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)