Photoinduced reorientation and polarization holography in photo-cross-linkable liquid crystalline polymer films with large birefringence
作者:Nobuhiro Kawatsuki、Ayumi Yamashita、Mizuho Kondo、Taro Matsumoto、Tatsutoshi Shioda、Akira Emoto、Hiroshi Ono
DOI:10.1016/j.polymer.2010.04.043
日期:2010.6
A new photo-cross-linkable liquid crystalline polymer (PLCP) comprised 4-methoxycinnamoyloxy groups connected with a bistolane side group was synthesized to investigate thermally enhanced photoinduced molecular reorientation of a thin film with linearly polarized (LP) 365 nm light exposure. Due to the axis-selective photoreaction of the cinnamate groups followed by the thermally induced self-organization
合成了一种新的可光交联的液晶聚合物(PLCP),该聚合物包含一个与一个Bistolane侧基相连的4-甲氧基肉桂酰氧基,以研究线性偏振(LP)365 nm曝光的薄膜的热增强光致分子取向。由于肉桂酸酯基团的轴选择性光反应以及随后的热诱导自组织作用,平行于LPUV光偏振的大分子取向(S > 0.6)和非共振区的大双折射(Δn = 0.34 at获得了632.8nm)。所得的Δn该值是可见区域中透明PLCP中最大的值。详细探讨了光反应度和退火温度对热增强分子取向行为的影响。最后,对于使用PLCP薄膜的薄光学器件的应用,使用325 nm He–Cd激光器以各种偏振模式制造了具有大双折射的纯偏振全息光栅,该光栅显示出周期性的分子取向结构,并表征了它们的光学特性。