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Chin. Phys. B, 2008, Vol. 17(9): 3227-3235    DOI: 10.1088/1674-1056/17/9/014
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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.
Keywords:  Bragg grating      diffusion kinetics      polymer dispersed liquid crystal  
Received:  13 October 2007      Revised:  28 November 2007      Published:  08 September 2008
PACS:  42.40.Eq (Holographic optical elements; holographic gratings)  
  42.70.Df (Liquid crystals)  
  42.79.Dj (Gratings)  
  61.30.Pq (Microconfined liquid crystals: droplets, cylinders, randomly confined liquid crystals, polymer dispersed liquid crystals, and porous systems)  
  82.50.Bc (Processes caused by infrared radiation)  
  82.80.Dx (Analytical methods involving electronic spectroscopy)  
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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