Dichroic dye-dependent studies in guest–host polymer-dispersed liquid crystal films

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• 作者：Praveen Malik ; K.K. Raina
• 关键词：Nematic liquid crystal ; Guest– ; host polymer-dispersed nematic liquid crystal ; Polymerization-induced phase separation ; Droplet morphology ; Anthraquinone dye
• 刊名：Physica B
• 出版年：2010
• 出版时间：1 January 2010
• 年：2010
• 卷：405
• 期：1
• 页码：161-166
• 全文大小：819 K

文摘

Guest–host polymer-dispersed liquid crystal (GHPDLC) films were prepared using a nematic liquid crystal, photo-curable polymer and dichroic dye (anthraquinone blue) by polymerization-induced phase separation (PIPS) technique. Non-ionic dichroic dye (1 % , 2 % and 4 %  wt./wt. ratio) was taken as guest in PDLC host. Polarizing microscopy shows that in the absence of electric field, liquid crystal (LC) droplets in polymer matrix mainly exhibit bipolar configuration, however, relatively at higher field, maltese-type crosses were observed. Our results show that 1 % dye-doped PDLC film shows better transmission and faster response times over pure polymer-dispersed nematic liquid crystal (PDNLC) and higher concentrated (2 % and 4 % ) GHPDLC films.