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Photochemically Induced Modification of Polymer Dispersed Liquid Crystals with Photochromic Stilbene. Photoreactions in Liquid Crystals (Part 8)

1992; Volume: 213; Issue: 1 Linguagem: Inglês

10.1080/10587259208028727

1058-725X

Olaf Zaplo, Joachim Stumpe, A. Seeboth, H. Hermel,

Photochemistry and Electron Transfer Studies

Abstract 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.