Polymer dispersed liquid crystal (PDLC) and guest host polymer dispersed liquid crystal (GHPDLC) films were prepared by phase separated polymerization induced phase separation (PIPS) technique. Micro-texture studies shows that the liquid crystal droplets of varying size (∼ 5–40 μm) consists mainly of bipolar configurations at lower field (∼ < 1V/μm). They develop into maltese type configuration at higher field (∼ 8V/μm, 10V/μm for PDLC and GHPDLC). It was seen that the optical transmission increases in both cases with increasing temperature. A higher threshold voltage for GHPDLC relative to PDLC films with temperature was noticed. GHPDLC film shows faster switching time (∼ 340 μsec) over PDLC (∼ 510 μsec).
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Malik et al. (2008) studied this question.
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