Electro–optic studies on polymer‐dispersed liquid crystal composite films. I. Composites of PVB–E7
Electro–optic studies on polymer‐dispersed liquid crystal composite films. I. Composites of PVB–E7
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DOI：
10.1002/(sici)1097-4628(19991227)74:14
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发表时间：
1999-12
影响因子：
3
通讯作者：
A. K. Kalkar;V. V. Kunte-V.;A. Deshpande
中科院分区：
文献类型：
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作者：
A. K. Kalkar;V. V. Kunte-V.;A. Deshpande
研究了聚乙烯醇缩丁醛（PVB）与聚乙烯醇缩丁醛液晶（E7）在PVB-E7复合体系中的电光性能。以氯仿为溶剂，室温下采用溶剂浇铸法制备了复合材料。扫描电子显微镜研究表明，E7相连续嵌入PVB基质的缝隙状结构中。采用HeNe激光器（λ = 632.8nm）测量复合膜（E7的60和70wt%负载）在交流（ac）电场（0-250，Vp-p）和频率（50 Hz-1 KHz）下的光学透射率。结果表明，（PVB-E7）复合材料表现出记忆效应。在存储状态下，在不施加电压的情况下保持较高的透射率。通过将膜加热到液晶的清除温度，可以擦除存储器状态并将其改变为散射关断状态。© 1999 John Wiley & Sons，Inc.应用聚合物科学杂志74：3485-3491，1999
The electro-optic performance characteristic of polymer-dispersed liquid crystal (PDLC) composite films out of poly(vinyl butyral) (PVB) and nematic liquid crystal (E7) have been studied for a wide range of PVB–E7 composite compositions (20–70 wt % of E7). Composites were prepared by solvent casting from chloroform at room temperature. A scanning electron microscopy study showed that a E7 phase is continuously embedded in chink-like structure of PVB matrix. Optical transmittance of the composite films (of 60 and 70 wt % loading of E7) under an alternating current (ac) electric field (0–250, Vp-p) and frequency (50 Hz to 1 KHz) were measured employing HeNe laser (λ = 632.8 nm). The results indicate that the (PVB–E7) composite exhibits a memory effect. In the memory state, higher transmittance is preserved without applying voltage. The memory state can be erased and changed to the scattering Off-state by heating the film to the clearing temperature of the liquid crystal. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 3485–3491, 1999