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Title: Dye-dependent studies on droplet pattern and electro-optic behaviour of polymer dispersed liquid crystal
Authors: Kumar P
Sharma V
Jaggi C
Raina K.K.
Keywords: anthraquinone dye
dichroic polymer dispersed liquid crystal
droplet morphology
Nematic liquid crystal
polymerisation induced phase separation
Issue Date: 2017
Publisher: Taylor and Francis Ltd.
Abstract: 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 (0 V), 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 (30 V), which illustrate vertical radial pattern. Further, results show that the DPDLC film containing 0.0625% dye concentration with consistent average droplet size ~4.30 ?m, exhibits the best transmission at lower operating voltage. � 2016 Informa UK Limited, trading as Taylor & Francis Group.
URI: 10.1080/02678292.2016.1240834
Appears in Collections:Journals

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