Effect of molecular weight of monomer on the processes of phase separation during the elaboration of composite materials type PDLC

2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV) Pub Date : 2014-12-29 DOI:10.1109/NAWDMPV.2014.6997613

Z. H. Belaid, A. Berrayah, F. Abdoune, L. Méchernène, L. Zair, Ulrich Maschke

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引用次数: 1

Abstract

Polymer Dispersed Liquid Crystals (PDLC) were elaborated by polymerization induced phase separation under ultraviolet (UV). A binary systems use in this study is composed of monomer of different molecular weights (TPGDA, PPGDA540 and PPGDA900), and 70 Wt.% of liquid crystal 5CB. The results showed a rapid decrease of the transmission of the LC droplet formation, followed by an enhancement of the transmission due to a thermal effect generated by exothermic curing, thermal diffusivity between components of the mixture monomers / LC, IR spectrum and high intensity of UV radiation emitted by LC3 lamp. PDLC films prepared exhibit different morphologies depending on the composition of the initial mixture, the UV dose, the molecular weight of the monomer and the nature of a LC. To quantify the effect of the molecular weight of the monomer on the kinetics of phase separation of the reactive mixtures, we realized a theoretical study that has given us a good accord with experiment.

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复合材料型PDLC制备过程中单体分子量对相分离过程的影响

采用紫外光聚合相分离法制备了聚合物分散液晶(PDLC)。本研究中使用的二元体系由不同分子量的单体(TPGDA、PPGDA540和PPGDA900)和70 Wt.%的液晶5CB组成。结果表明，LC液滴形成后透射率迅速下降，随后由于放热固化产生的热效应、单体/ LC混合物组分之间的热扩散系数、红外光谱和LC3灯发出的高强度紫外辐射而增强透射率。根据初始混合物的组成、紫外线剂量、单体的分子量和LC的性质，所制备的PDLC薄膜表现出不同的形貌。为了量化单体分子量对反应混合物相分离动力学的影响，我们进行了与实验结果吻合较好的理论研究。

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2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)

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