Kinetics investigations for holographic Bragg gratingbased on polymer dispersed liquid crystal
Zheng Zhi-Gang(郑致刚)a)b), Song Jing(宋静)c), Zhang Ling-Li(张伶莉)a)b), Liu Yong-Gang(刘永刚)a), Guo Fu-Zhong(郭福忠)a)b), Ma Ji(马骥)d), Li Wen-Cui(李文萃)a)b), Deng Shu-Peng(邓舒鹏)a)b), and Xuan Li(宣丽)a)†
a State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China; b Graduate School of Chinese Academy of Sciences, Beijing 100039, China; c Materials Sciences and Engineering School, Changchun University of Science and Technology, Changchun 130022, China; d SVA Optronics Co. Ltd, Shanghai 200233, China
Abstract This paper investigates the monomer kinetics of polymer dispersed liquid crystal (PDLC) grating. Fourier transform infrared (FTIR) spectra are used in the studies of photoreaction kinetics. The results indicate that there is a relative stable stage arises after a very short initial stage. Based on FTIR studies, the monomer diffusion equation is deduced and necessary numerical simulations are carried out to analyse the monomer conversion which is an important point to improve phase separation structure of PDLC grating. Some simulation results have a good agreement with experimental data. In addition, the effects induced by monomer diffusion constant $D$ and diffusion--polymerization-ratio rate $R$ are discussed. Results show that monomer conversion can be improved by increasing value of $D$. Besides, a good equilibrium state ($R=1$) is more beneficial to the diffusion of monomer which is important in the process of phase separation.
Received: 13 October 2007
Revised: 28 November 2007
Accepted manuscript online:
Fund: Project supported by Natural
Science Foundation of China (Grants Nos 60578035 and 50473040) and
Science Foundation of Jilin Province, China (Grant Nos 20050520 and
20050321-2).
Cite this article:
Zheng Zhi-Gang(郑致刚), Song Jing(宋静), Zhang Ling-Li(张伶莉), Liu Yong-Gang(刘永刚), Guo Fu-Zhong(郭福忠), Ma Ji(马骥), Li Wen-Cui(李文萃), Deng Shu-Peng(邓舒鹏), and Xuan Li(宣丽) Kinetics investigations for holographic Bragg gratingbased on polymer dispersed liquid crystal 2008 Chin. Phys. B 17 3227
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