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Liquid Crystal Polymer Systems For Rewritable Optical Recording

用于可重写光学记录的液晶聚合物系统

基本信息

批准号：
04555214
负责人：
ICHIMURA Kunihito
金额：
$ 12.99万
依托单位：
Tokyo Institute of Technology, Research Laboratory of Resources Utilization
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

Two types of photosensitive liquid crystalline systems were studied to apply to reversible opticak memory.1.Photoinduced phase change of liquid crystal polymers(1) Photoinduced phase change of nematic liquid crystalline polymers into isotropic phase under UV-irradiation for the photoisomerization of doped azobenzenes was considerably enhanced by attaching non-mesogenic residues in the side chains as a result of the reduction of an order parameter of the mesophase. The recovery of the nematic phase was caused by illumination with blue light although an aging period was required.2.Liquid crystal alignment photoregulation mediated by polymer surfaces(1) An azimuthal alignment of nematic liquid crystal layrs was controlled by irradiation of a cell fabricated with substrate plates covered with photochromic molecular layrs with linearly polarized light. Rewriting of an optical memory based on this working principle was realized simply by changing an electric vector of actinic light.(2) Three … More types of photoaligning polymer thin films were developed. The first involves the surface-selective introduction of azo-chromophores on a poly (vinyl alcohol) thin film. The second method is based on spin-coating of a thin film of polymers substituted with azobenzenes in their side chains. The third one consists of the deposition of Langmuir-Blodgett films of a polyimide bearing azobenzene units on a substrate plate.(3) Factors affecting optical quality of photoimages and exposure energy required for liquid crystal reorientation were investigated. Photoimages resolving few mum lines and spaces were quite stable at a temperature below a nematic/isotropic transition temperature (T_<N1>) and erased by heating above T_<N1> or simply by overwriting with polarized actinic light with a different polarization plane.(4) The surface-mediated optical recording is highly of practical significances because they can be operated by irradiation with a single light source emitting visible light which results in no observable photodegradation of azobenzenes. Less

本文研究了两类光敏液晶体系在可逆光存储器中的应用. 1.液晶聚合物的光致相变（1）掺杂偶氮苯的光致异构化反应在紫外光照射下由双折射液晶聚合物向各向同性相的光致相变过程中，非-侧链中的介晶残基作为中间相的有序参数降低的结果。向列相的恢复是由蓝光照射引起的，尽管需要一个老化期。2.聚合物表面介导的液晶取向光调节（1）向列液晶层的方位角取向通过用线偏振光照射由覆盖有光致变色分子层的基板制成的单元来控制。基于该工作原理的光存储器的重写仅通过改变光化光的电矢量来实现。(2)三 ...更多信息开发了多种类型的光配向聚合物薄膜。第一个涉及的表面选择性引入偶氮生色团的聚（乙烯醇）薄膜。第二种方法是基于在其侧链中被偶氮苯取代的聚合物的薄膜的旋涂。第三种是在基板上沉积带有偶氮苯单元的聚酰亚胺的Langmuir-Blodgett膜。(3)研究了影响光学图像质量的因素和液晶重取向所需的曝光能量。分辨几个微米线和空间的光图像在低于各向同性/各向同性转变温度（T_）的温度下是相当稳定<N1>的，并且通过在T_以上加热<N1>或简单地通过用具有不同偏振平面的偏振光化光进行偏振来擦除。(4)表面介导的光记录具有很高的实际意义，因为它们可以通过用发射可见光的单个光源照射来操作，这导致偶氮苯没有可观察到的光降解。少