PHOTOALIGNMENT FILMS OF POLYESTERS WITH PHOTOREACTIVE MAIN-CHAIN

Citation
S. Song et al., PHOTOALIGNMENT FILMS OF POLYESTERS WITH PHOTOREACTIVE MAIN-CHAIN, JPN J A P 1, 37(5A), 1998, pp. 2620-2624
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Applied
Volume
37
Issue
5A
Year of publication
1998
Pages
2620 - 2624
Database
ISI
SICI code
0021-4922(1998)37:5A<2620:PFOPWP>2.0.ZU;2-U
Abstract
The photoreactive thin films of poly(oxyalkyleneoxy-1,4-phenylenediacr yloyl), a PDA-n polyester (n=2-5), were prepared. Their photoreactions and the liquid crystal (LC) photoalignment by irradiation of linearly polarized UV light (LPL) were investigated. The PDA-n polyesters have photoreactive sites in the polymer main chain and not in the side cha in which is different from poly(vinyl cinnamate) (PVCi), a well-known photoalignment polymer. These PDA-n thin films show different photorea ctivities depending on the number of methylene units, n. Odd-numbered PDA-n polyesters with higher photosensitivity than even-numbered PDA-n . polyesters show a dichroism due to irradiation with LPL which result s in a homogeneous alignment of the nematic LC.