【摘要】 利用新近合成的聚酰亚胺ＬＢ膜定向铁电液晶分子，通过原子力显微镜对经不同亚胺化温度处理的聚酰亚胺ＬＢ膜进行扫描探测，发现相应的ＬＢ膜具有不同的形貌结构，认为高温亚胺化的ＬＢ膜可以提供较高的势垒，这为铁电液晶双稳记忆性的出现提供了可能，而ＬＢ膜的超薄特性有利于开关过程中表面聚积电荷的中和与释放，保证了器件优良的双稳记忆性的最终获得以及微秒量级快速响应的实现。更多还原

【Abstract】 Newly-synthesized polyimid (PI) LB films were deposital and used to align ferroelctric liquid Crystals (FLCs). Atomic force microscope was used to investigate the morphology of PI LB films. It is found that LB films show different crystalline structure when they were treated by the different imidization temperatures. The LB films imidized at the high temperature show the orderly oriental polymer chain structure on the sustrate surfaces while the low temperature treated LB films show an irregular amphours-like aggregate structure. It demonstrates that these two types of PI LB films show different surface orderness and crystallinity. The surface-stabilized FLC cells that are aligned by the high temperature imidized PI LB films have the fast response times of 80 and 90us to the rising and decaying stages respectively and an excellent bistability to the completeness, while the cells which are aligned by the low temperature eded PI LB films show slower response times longer than 1ms and the incomplete memory capability. According to the AFM observations and the charge-transfer model in the interface between LB alignment films and the FLC layer, it is regarded that the LB films eded at the high temperature can provide a higher energy barrier than that of imidized at the low temperature, which facilitates the appearance of FLC bistability. In addition, the ultra-thinness of LB films is beneficial for the neutralization and release of the surface charges brought out during the switching process, which guarantees the oblainment of excellent bistable memory capability and the realization of fast response up to micro-seconds in the surface-stabilzed FLC devices.更多还原