STUDY ON INFORMATION WRITING AND STORAGE BY ELECTRON,PHOTON AND HEAT MODES FOR (POLYMER/LIQUID CRYSTAL) COMPOSITE FILMS

(1)聚合物/液晶复合膜的制备及热性能研究采用溶剂浇铸法制备了由液晶聚合物、低分子液晶和光响应型液晶组成的三元复合膜。采用差示扫描量热法(DSC)、偏光显微镜和X射线衍射法对不同复合分数的聚合物/液晶复合膜进行了研究。(2)复合薄膜的电学、光学和热学响应。基于复合薄膜的可见紫外光谱，研究了光响应分子的光致异构化反应动力学。确定了光子模式写入的最佳条件。(3)光开关测试评价了夹在两个透明电极之间的复合膜的光散射-透明开关特性。研究了从光散射态到透明态的临界频率随光照射的变化关系。(4)光学写入和擦除实验测量了两种波长下的临界频率。评估了在光照射和电场作用下的光散射-透明开关特性。在此基础上，实现了数字信息的电子式、光子式和热式写入、存储和擦除。

(1) Preparation and thermal property of (polymer/liquid crystal) composite filmTernary composite films consisting of a liquid crystalline polymer, a low molecular weight liquid crystal and a photoresponsive liquid crystal were prepared by a solvent cast method. DSC,polarizing optical microscopic and X-ray diffraction studies were performed for (polymer/liquid crystal) composite films with various composite fraction. Based on the phase diagrams, the smectic phase in which electron, photon and thermal writing could be carried out was identified.(2) Electric, optical and thermal response of the composite filmThe kinetics of the photoisomerization of the photoresponsive molecules depending on the wavelength and intensity of the irradiated light was evaluated based on the visibleultraviolet spectroscopy of the composite film. The optimum condition of photon mode writing was determined.(3) Light switching measurementsThe light scattering-transparent switching characteristics were evaluated for the composite films sandwiched between two transparent electrodes. The photo-irradiation dependence of the critical frequency from the light scattering state to the transparent state was investigated.(4) Optical writing and erasingThe critical frequencies upon irradiations of two kinds of wavelength were measured. The light scattering-transparent switching properties driven by a light irradiation and an electric field application were evaluated. Based on above results, writing, storaging and erasing of the digital information by electron, photon and heat modes were achieved.