Dynamic Temperature Distribution in Photo-induced Alignment of Azobenzene Liquid Crystalline Polymer

✍ Scribed by Dan Zhao; Qijin Zhang; Yong Lu; Jian Li; Jian Liu; Xiaofang Cheng

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 344 KB
• Volume: 12
• Category: Article
• ISSN: 1022-1344
• DOI: 10.1002/mats.200350018

✦ Synopsis

Abstract

A theoretical model has been established to describe the dynamic temperature distribution during the alignment of an azobenzene liquid crystalline polymer irradiated by a linearly polarized laser beam. The dynamic heat diffusion equations are used, and the relationship between heat source item and time is introduced, based on experimental results. With the model, the contours of the temperature distribution at different time have been worked out. It can be found from the theoretical model that there is a maximum temperature rise during the photo‐induced alignment, which is coincident with the analysis of experimental observations. The existence of a minimum laser power and an offset photo‐alignment temperature T~off~ required to carry on photo‐induce alignment are explained based on the theoretical model.

Temperature distribution after two minutes.

imageTemperature distribution after two minutes.