Kinetics of Photopolymerization for the Acrylate/Liquid Crystal Mixture

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (6): 1407.

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Kinetics of Photopolymerization for the Acrylate/Liquid Crystal Mixture

SHI Xiao-Jing¹, PENG Hai-Yan¹, LIAO Yong-Gui¹, XIE Xiao-Lin^1,2*

1. School of Chemistry & Chemical Engineering,
2. National Anti\|counterfeit Engineering Research Center, Huazhong University of Science and Technology, Wuhan 430074, China

Received:2010-07-15 Revised:2010-08-17 Online:2011-06-10 Published:2011-05-10
Contact: XIE Xiao-Lin E-mail:xlxie@mail.hust.edu.cn
Supported by:
国家杰出青年基金(批准号: 50825301)资助.

Abstract

Abstract: Photo differential scanning calorimetry (P-DSC) was used to characterize the photopolymerization kinetics for the mixture of 2-ethylhexyl acrylate (EHA), trimethylolpropane trimethacrylate (TMPTA) and nematic liquid crystal (P0616A) with 2, 4, 6-trimethylbenzoyldiphenyl phosphine oxide (TPO) as photoiniator at different reaction temperature ranged from -40oC to 80oC. The results revealed that the auto-acceleration of photopolymerization is more obvious than the traditional free radical polymerization, and there are maxima in photopolymerization rate and apparent kinetic constant. The final conversion and the maximum photopolymerization rate increase with the reaction temperature. After the reaction temperature rises to 20oC, the above increases are slight. Rpmax decreases with increasing the content of liquid crystals, and the conversion increases slowly with time. But the final conversions have a slight difference for the acrylate/liquid crystal mixture with different LC content, and all of them close to 80%. With increasing the UV intensity, both of Rpmax and the final conversion increase obviously. The threshold value of UV intensity is 4 mW/cm2. However, Rpmax and the final conversion tend to decrease with increasing the average functionality of monomers.

Key words: Liquid crystals, acrylate, P-DSC, photopolymerization kinetics

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SHI Xiao-Jing, PENG Hai-Yan, LIAO Yong-Gui, XIE Xiao-Lin*. Kinetics of Photopolymerization for the Acrylate/Liquid Crystal Mixture[J]. Chem. J. Chinese Universities, 2011, 32(6): 1407.

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Kinetics of Photopolymerization for the Acrylate/Liquid Crystal Mixture

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