单臂液晶冠醚LB膜的研究

Studies on LB Films of Monoarm Liquid Crystalline Crown Ethers

首次研究了４种单臂液晶冠醚（１～４）的ＬＢ膜成膜特性，实验发现它们在气－液界面均可形成单分子膜，但４的稳定性较差，３易转移到玻璃基片上形成Ｙ型膜。４种化合物与硬脂酸以１∶１混合形成稳定的Ｙ型ＬＢ膜。小角Ｘ射线衍射证实了膜的有序结构。用ＣＰＫ原子模型对成膜分子构型和面积进行了估算，其结果与实验一致，并讨论了分子结构对成膜性能的影响。

Four monoarm liquid crystalline crown ethers(1-4) were first studied by the method of LB technique. Among them, 1, 2 and 3 were found to form stable monolayers at air-water interface but 4 not. Monolayers formed by 3 could easily be transferred onto glass substrate to assemble in and to form Y type LB film, Furthermore, the mixed LB films of the four compounds with stearic acid(1:1) were studied and Y type mixed LB films were obtained. All above were characterized by π-A curves and low angle X-ray diffractions. The molecular configurations in the films were estimated with CPK atomic model which gave the same results as experiments.The effect of molecular structures on the stability of LB films was briefly discussed.