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

(1)聚合物/液晶复合薄膜的制备及热性能采用溶剂铸造法制备了由液晶聚合物、低分子量液晶和光响应液晶组成的三元复合薄膜。对不同复合组分的（聚合物/液晶）复合膜进行了DSC、偏光显微镜和x射线衍射研究。根据相图，确定了能进行电子、光子和热写入的近晶相。(2)复合膜的电学、光学和热响应。基于复合膜的可见紫外光谱，评价了光响应分子的光异构化动力学随辐照光的波长和强度的变化。确定了光子模式写入的最佳条件。(3)光开关测量：对夹在两个透明电极之间的复合薄膜的光散射-透明开关特性进行了评价。研究了临界频率从光散射态到透明态的光辐照依赖性。(4)光学写入和擦除。测量了两种波长辐照下的临界频率。研究了光辐照和电场驱动下的光散射-透明开关特性。在此基础上，实现了电子、光子和热模式对数字信息的写入、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.