Effect of external electrical field on phase behavior and morphology development of polymer dispersed liquid crystal |
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Authors: | Dianzhi Yang Tao Li Shaoliang Lin Xiaohui Tian |
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Institution: | Department of Polymer Science and Engineering, East China University of Science and Technology, No. 130, Meilong Road, Shanghai 200237, PR China |
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Abstract: | Phase diagrams for mixtures of liquid crystal (LC)/monomer with and without an external electrical field applied have been established using polarized light microscope (PLM).The (isotropic + nematic) coexistent phase region and (isotropic + isotropic) phase boundary of LC/monomer mixtures were observed to shift upward to higher temperatures when the external electrical field exists. It was found that the electrical field applied during the cross-linking polymerization has a significant influence on the phase diagrams for the LC/polymer mixtures by rendering the coexistent phase regions shift upward to higher temperatures. The influence of the external electrical field on the processes of the isotropic-isotropic phase separation and liquid crystal ordering in PDLC formation has also been investigated. The results revealed that both the processes could be highly accelerated by the electrical field. |
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Keywords: | Polymer dispersed liquid crystal (PDLC) Phase behavior Electrical field Morphology Phase separation Liquid crystal ordering |
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