聚合物分散液晶PMMA-5CB的制备及电光性能

Preparation and Electro-Optical Properties of PMMA-5CB Polymer Dispersed Liquid Crystal

以聚合引发相分离的方法制备了聚甲基丙烯酸甲酯（PMMA）基聚合物分散液晶（PDLC）。通过差示量热扫描仪（DSC）、偏光显微镜（POM）对不同液晶5CB（4-氰基-4′-戊基联苯）含量的PDLC热力学行为和液晶分散状态进行了表征。在电压为0~30 V、波长为633 nm处,用紫外可见分光光度计（UV-Vis）对PDLC的电光性能进行了研究。结果表明当w（5CB）达到20%以上时,PDLC发生相分离现象;当w（5CB）=30%时,液晶的分散状态最佳,电光效应最强。

Poly（methyl methacrylate）-based polymer dispersed liquid crystal（PDLC） materials were prepared by the method of polymerization induced phase separation （PIPS）.The phase separation and disper-（sed） states of the PDLC with different 5CB contents were characterized by DSC and POM.The electro-（optical） properties of the samples were investigated using UV-Vis spectroscopy at 633 nm,0～30 V.（Results） showed that when the mass fraction of liquid crystal 5CB was 30% in PDLC,the dispersed states of liquid crystal were well-proportioned,and the variation of transmittance reached the highest value.