PDLC films prepared by electron beam and ultraviolet curing: influence of curing conditions on the electro-optical properties |
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Authors: | Frederic Gyselinck Ulrich Maschke Andre Traisnel Xavier Coqueret |
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Institution: | Department of Chemistry , Tsinghua University , Beijing, 100084, PR China |
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Abstract: | Polymer dispersed liquid crystal (PDLC) films were prepared by polymerization-induced phase separation processes using ultraviolet (UV) and electron beam (EB) radiation. A mixture of the nematic LC material E7, an aromatic polyester acrylate, and additional monomeric acrylates was exposed to the EB radiation. A photoinitiator was included in the initial mixture in the case of UV exposure. The electro-optical behaviour of the PDLC films obtained has been investigated as a function of the chosen radiation. The transmission versus voltage curves strongly depend on the curing conditions, and are highly reproducible. Threshold and saturation voltages continuously increase with increasing dose values for UV-cured films, whereas plateau values were reached for EB-cured samples. A small memory effect has been observed for UV-cured systems. |
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Keywords: | bent-core biaxial nematic oxadiazole binary mixture cis–trans isomers geraniol nerol terpene |
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