倒浮萍聚合物ES-3LB膜掠角反射-吸收红外光谱的研究

用傅里叶变换红外掠角反射-吸收光谱技术对ES-3LB膜的取向和相变行为进行了详细的研究.结果表明,在金表面上制备的ES-3LB膜中烷基链基本垂直于基面.相转变行为的研究表明,ES-3LB膜有3个相变点,分别在65,105和140℃.第一个相变过程表现为LB膜从一种有序状态到另一种有序状态的转变;第二个相变过程表现为LB膜中烷基链的有序-无序转变;第三个相变过程是LB膜的层状结构坍塌转变为各向同性熔融体的过程.

A Multilayer Langmuir-Blodgett Film of Reversed Duckweed Polymer ES-3 Studied by Infrared Grazing Reflection-absorption Spectroscopy

Molecular orientation and phase transition behavior in the multilayer Langmuir-Blodgett(LB) film of reversed duckweed polymer ES-3 were investigated by infrared grazing reflection-absorption(IR-GRA) spectroscopy. It was found that the orientation of alkyl chains was nearly perpendicular to the substrate surface for ES-3 LB film on Au-evaperated glass slide. The study on its thermal transition behavior indicates that ES-3 LB film has three phase transition processes,occurring near 65, 105 and 140 ℃, respectively. The first transition corresponds to a conversion from a highly ordered state to the slightly less ordered one with a little increase in the mobility of alkyl chains; the second process is attributable to the order-disorder transition of alkyl chains; and the third is a process of collapse of layer structure.