ABSTRACT

Polymer-Dispersed Liquid Crystal, PDLC, are composite materials formed by liquid crystal droplets embedded in a polymer matrix. They allow to simultaneously exploit the electro-optical properties of liquid crystals and the mechanical properties of polymers, giving rise to interesting electro-optical devices such as smart windows. In this work monomer/LC mixtures in different weight ratios were polymerised in the presence of an external magnetic field to obtain PDLCs, whose director was aligned along the field direction. The time behaviour of LC order parameter was followed by ²H-NMR and the final morphology of PDLCs was investigated by SEM. Then, the electro-optical properties of PDLCs prepared in the absence of any magnetic field were investigated and correlated to the order parameter measurements, confirming the strong correlation between large order parameters and optimal electro-optical properties.

摘要

聚合物分散液晶 (PDLC) 是由嵌入聚合物基质中的液晶液滴形成的复合材料。它们允许同时利用液晶的电光特性和聚合物的机械特性，从而产生有趣的电光设备，例如智能窗户。在这项工作中，不同重量比的单体/LC 混合物在外部磁场存在下聚合以获得 PDLC，其指向矢沿场方向排列。LC 阶次参数的时间行为后跟²通过 SEM 研究了 H-NMR 和 PDLC 的最终形态。然后，研究了在没有任何磁场的情况下制备的 PDLC 的电光特性，并将其与阶参数测量相关联，证实了大阶参数与最佳电光特性之间的强相关性。