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Photosensitive polymer dispersed liquid crystals (PDLC) were prepared using the nematic mixture E-5 doped with 2 wt-% photochromic stilbene dye in a gelatin binder. The stilbene undergoes E-Z photoisomerization on irradiation. The change of the configuration of dopants perturbs the liquid-crystalline order and the clearing point of the mixture is lowered slightly. Irradiating the stilbene-doped gelatin PDLC, the preferred director orientation of the dopants is destroyed. Therefore, the optical properties as well as the Volta potential AV of stilbene-doped PDLC are changed. Differences have been observed between hot- and cold-dried PDLC films.
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Zaplo et al. (1992) studied this question.
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