Kinetics investigations for holographic Bragg gratingbased on polymer dispersed liquid crystal
Song Jinga, Liu Yong-Gangb, Xuan Lib, Zheng Zhi-Gangc, Zhang Ling-Lic, Guo Fu-Zhongc, Li Wen-Cuic, Deng Shu-Pengc, Ma Jid
a Materials Sciences and Engineering School, Changchun University of Science and Technology, Changchun 130022, China; b State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China; c State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;Graduate School of Chinese Academy of Sciences, Beijing 100039, 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
Published: 08 September 2008
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, Song Jing, Zhang Ling-Li, Liu Yong-Gang, Guo Fu-Zhong, Ma Ji, Li Wen-Cui, Deng Shu-Peng, Xuan Li Kinetics investigations for holographic Bragg gratingbased on polymer dispersed liquid crystal 2008 Chin. Phys. B 17 3227
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