An investigation on a novel PDLC film's fabrication and its electro-optical properties

A polymer dispersed liquid crystal (PDLC) film that has good electro-optical properties is produced by the method of polymerized-induced phase separation. Based on the application foreground, its capability parameters, such as contrast ratio, work voltage, and visual angle, are characterized for the first time by a white light but not a fixed wavelength light. The results show the PDLC film has a low work-voltage of 20 V, more than 150° visual angle, high stability, and long lifetime. The differences between plastic and glass ITO-coated substrates of PDLC films are also studied in this paper. The plastic substrate has better property and will have a wider perspective especially in the portable, tender and folded display devices. Due to adjustable properties of film by electric field, PDLC has the potential application for display device, sensor, switch, grating, and new generation analytical apparatus.

环氧基聚合物分散液晶膜的制备及其性能研究

采用聚合相分离方法制备环氧树脂基PDLC膜。通过对液晶含量、固化温度和时间等条件进行优化,研究上述条件对PDLC膜性能的影响;使用UV-Vis、AFM、SEM等方法对聚合物的物理特性和PDLC膜的光电性质做了深入探讨。PDLC膜在传感器、光电开关、光栅以及新型分析仪器元器件等方面具有广阔的应用前景。

淬火法制备热固化环氧树脂基聚合物分散液晶膜及其调光性能的优化

聚合物分散液晶(PDLC)膜是液晶(LC)微滴分布在聚合物网络结构中形成的一种通过施加电压实现雾化态与透明态转换的材料,可应用于智能调光玻璃等领域。以双酚A环氧树脂(EP)与两种不同分子量的聚醚二胺(D400和D2000)反应生成的交联聚合物作为PDLC膜的基体,在采用淬火工艺的基础上,研究了LC浓度、固化温度和固化时间以及EP、D400、D2000配比对PDLC样品的关态与开态透光率(T_(off)和T_(on))、雾度及驱动和饱和电压(V_(th)和V_(sat))的影响,同时用偏光显微镜观察了LC微滴的尺寸与分布密度。结果表明:当LC浓度为38%(质量分数),固化温度和固化时间分别为100℃、2 h,EP、D400、D2000物质的量比为4.4∶1.75∶1时,PDLC膜的综合性能最优,即:T_(off)为7.05%,T_(on)为66.6%,V_(th)为17 V,V_(sat)为33 V,关态雾度为90%,加60 V电压的开态雾度为15.6%。另外,分析了PDLC膜的调光性能与其LC微滴大小、分布及树脂网络结构致密度的关系。