聚合物分散液晶旋光性能研究

通过紫外光照射后,在光引发剂作用下预聚物发生自由基聚合,制备了含有手性掺杂的聚合物分散液晶.用偏光显微镜观察小分子液晶的粒径大小及其在聚合物网络中的分布形态,通过三官能团预聚物三羟甲基丙烷三丙烯酸酯的快速聚合获得了微米级液晶微滴,用旋光仪(PerkinEl mer Model 341 Polari meter)测量温度作用下手性聚合物分散液晶的旋光性变化,结果与de Vries理论相一致.手性掺杂的聚合物分散液晶的旋光性、选择反射等独特的光学性能被广泛应用于滤波片、光栅、反射显示等方面.

Study on Optical Rotation of Polymer Dispersed Chiral Liquid Crystal

The chiral polymer dispersed liquid crystal (PDLC) was fabricated by free radical polymerization under the action of photoinitiator by ultraviolet iradiation. The morphology and effect of temperature on optical rotation in chiral PDLC film were discussed via POM and polarimeter respectively. The trifunctional pre-polymer TMPTA which is available to quick polymerization was selected to obtain the dispersion of liquid crystal droplets in micrometer size. As a result, the effect of temperature on optical rotation through the measurement by polarimeter conforms to the theory of de Vries. Such distinctive optical properties as opticity and selective reflection of chiral agent-doped PDLC have widely been applying in the field of light filter, grating, and reflective display, etc.