Journal
LIQUID CRYSTALS
Volume 44, Issue 4, Pages 757-767Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2016.1240834
Keywords
Nematic liquid crystal; dichroic polymer dispersed liquid crystal; polymerisation induced phase separation; droplet morphology; anthraquinone dye
Funding
- Department of Science and Technology, India [IF150442]
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In order to study the droplet pattern and electro-optic (EO) behaviour of polymer dispersed liquid crystal (PDLC) with the addition of dye, dichroic polymer dispersed liquid crystal (DPDLC) films were prepared using a nematic liquid crystal (NLC), photo-curable polymer (NOA 65) and anthraquinone blue dichroic dye (B2), in equal ratio (1:1) of polymer and liquid crystal (LC) by polymerisation induced phase separation (PIPS) technique. Dichroic dye was taken in different concentration (wt./wt. ratio) as 0.0625%, 0.125%, 0.25%, 0.5% and 1% of the LC mixture in DPDLC films. Initially, in an open circuit when there is no proviso for external electric field (0V), LC droplets in polymer matrix exhibited bipolar pattern, though on closing the circuit with the increase of electric field pattern of droplets starts changing, LC molecules align along the direction of applied electric field and aligned completely relatively at higher field (30V), which illustrate vertical radial pattern. Further, results show that the DPDLC film containing 0.0625% dye concentration with consistent average droplet size similar to 4.30m, exhibits the best transmission at lower operating voltage. [GRAPHICS] .
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