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选用侧链含有双元光敏基团的梯形聚硅氧烷材料作为光取向材料,采用偏光显微镜(POM)及晶体旋转法,研究了梯形聚硅氧烷光取向层的制备条件,包括取向剂浓度、紫外光辐照度及光照时间对光取向层的取向行为的影响.结果表明,取向剂浓度越大,光敏基团更易于组装成垂直取向状态,进而诱导液晶分子形成垂直取向的分子排列方式.在一定的紫外光辐照度范围内可以有效地引起偶氮苯光敏基团的面内、面外异构化及再取向,有利于取向层诱导液晶分子形成平面取向的分子排列方式.紫外光光照时间的增加有利于取向层诱导液晶分子形成平面取向的分子排列方式.
Adopting the trapezoidal polysiloxane with side-chain photosensitive groups as the photo-alignment material, the preparation conditions of the photo-alignment layer of the trapezoidal polysiloxane were investigated by POM and crystal rotation method. , Ultraviolet irradiance and illumination time on the orientation behavior of the photoalignment layer were investigated.The results showed that the larger the alignment agent concentration, the easier the photosensitizing groups are assembled into the vertical orientation state, and then the molecules with vertical orientation are induced to form the liquid crystal molecules It is in the range of UV irradiance that the azobenzene photosensitive groups can be effectively isomerized and reoriented in-plane and out-of-plane, which is conducive to the alignment of liquid crystal molecules to form a planar alignment molecular orientation. The increase of light illumination time is conducive to the alignment of the liquid crystal molecules to form a planar orientation of the molecular arrangement.