摘要
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 6 5 ,1 0 5和 1 4 0℃ .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 .
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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第1期174-177,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金 (批准号 :2 9975 0 11
2 96 330 10 )资助
