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Dynamic Temperature Distribution in Photo‐induced Alignment of Azobenzene Liquid Crystalline Polymer
Author(s) -
Zhao Dan,
Zhang Qijin,
Lu Yong,
Li Jian,
Liu Jian,
Cheng Xiaofang
Publication year - 2003
Publication title -
macromolecular theory and simulations
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 56
eISSN - 1521-3919
pISSN - 1022-1344
DOI - 10.1002/mats.200350018
Subject(s) - azobenzene , materials science , offset (computer science) , polymer , laser , heat equation , distribution (mathematics) , optics , molecular physics , thermodynamics , chemistry , composite material , physics , computer science , mathematical analysis , mathematics , quantum mechanics , programming language
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.