In this study, polymer dispersed liquid crystal (PDLC) films comprising a phase separated low molecular weight thermotropic liquid crystal (LC) and high molecular weight polymer were, prepared using the polymer–induced phase separation method. In order to enhance the optical efficiency of the PDLC films, LC was doped with dichroic azo dye. Various characterization techniques were employed to determine the properties of the components and, the operating principles of the dye–doped PDLC (DPDLC) films. Morphological studies using polarizing optical microscopy and scanning electron microscopy indicated that the LC droplet configuration changed with various dye concentrations and voltages. Electro-optical analysis showed that the performance of the DPDLC film with a low dye concentration (0.007%) was excellent, with a high contrast ratio (241) and transmittance difference (ΔT = 98.57%), low threshold (V_TH = 0.85 V/μm) and saturation voltages (V_SAT = 1.45 V/μm), and a minimum hysteresis effect. The effects of temperature on the electro-optical properties of the DPDLC films were studied. Absorbance analyses were conducted using ultraviolet–visible spectrophotometry to complement the transmittance analyses. Dielectric relaxation spectroscopy was employed to measure relaxation frequency/time of DPDLC films. Debye and Cole – Cole modeling were conducted to understand nature of the relaxation process. The zero values of the distribution parameter (α) for all of the DPDLC composite films confirmed their Debye type relaxation process.

在这项研究中，使用聚合物诱导相分离方法制备了包含相分离的低分子量热致液晶 (LC) 和高分子量聚合物的聚合物分散液晶 (PDLC) 薄膜。为了提高 PDLC 薄膜的光学效率，LC 掺杂了二色性偶氮染料。采用各种表征技术来确定组件的特性以及染料掺杂的 PDLC (DPDLC) 薄膜的工作原理。使用偏振光学显微镜和扫描电子显微镜的形态学研究表明，LC 液滴构型随各种染料浓度和电压而变化。电光分析表明，低染料浓度（0.007%）的DPDLC薄膜性能优异，_TH  = 0.85 V/μm) 和饱和电压 (V _SAT  = 1.45 V/μm)，以及最小滞后效应。研究了温度对DPDLC薄膜电光性能的影响。使用紫外-可见分光光度法进行吸光度分析以补充透射率分析。介电弛豫光谱用于测量 DPDLC 薄膜的弛豫频率/时间。Debye 和 Cole – 进行 Cole 建模以了解松弛过程的性质。所有 DPDLC 复合膜的分布参数 (α) 的零值证实了它们的德拜型弛豫过程。