两亲性嵌段聚醚酯在空气-水界面上的Langmuir单分子膜  

LANGMUIR MONOLAYERS OF AMPHIPHILIC PET/PEO BLOCK COPOLYMERS AT AIR-WATER INTERFACE

作　　者：杨红伟[1] 朱谱新[1] 姚永毅[1] 高绪珊[2] 李瑞霞[1] 吴大诚[1] 

机构地区：[1]四川大学纺织研究所,成都610065 [2]北京服装学院材料工程学院,北京100029

出　　处：《高分子学报》2007年第1期93-96,共4页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号50473050)资助项目

摘　　要：The monolayers of amphiphilic block copolymers PET/PEO with different weight fractions of hard segments were investigated at air-water interface by the Langmuir balance technology.Isotherms of surface pressure and the mean area per hard segment were measured for four samples of the block copolymer with the weight fraction of hard segments in the range of 0.35～0.50.It was found that the molecular limited area of the monolayer was gradually decreasing with increasing the weight fraction of hard segments,and hence the monolayer of the amphiphilic block copolymer became more condensed.The dynamic surface elasticity of the monolayer was measured by using the barrier oscillation method,and it indicated that the dynamic surface elasticity of the monolayer was gradually increased with increasing the surface pressure.Furthermore,for all the samples,the dynamic surface elasticity was almost the same at surface pressure lower than 17～18 mN/m;however,the dynamic surface elasticity of the monolayer for the block copolymer with the weight fraction of hard segments equal to 0.50 was increasing obviously and much greater than those of other copolymers at surface pressures higher than 18 mN/m.The monolayers of amphiphilic block copolymers PET/PEO with different weight fractions of hard segments were investigated at air-water interface by the Langmuir balance technology. Isotherms of surface pressure and the mean area per hard segment were measured for four samples of the block copolymer with the weight fraction of hard segments in the range of 0.35 ～ 0.50. It was found that the molecular limited area of the monolayer was gradually decreasing with increasing the weight fraction of hard segments, and hence the monolayer of the amphiphilic block copolymer became more condensed. The dynamic surface elasticity of the monolayer was measured by using the barrier oscillation method, and it indicated that the dynamic surface elasticity of the monolayer was gradually increased with increasing the surface pressure. Furthermore, for all the samples, the dynamic surface elasticity was almost the same at surface pressure lower than 17 ～ 18 mN/m; however, the dynamic surface elasticity of the monolayer for the block copolymer with the weight fraction of hard segments equal to 0.50 was increasing obviously and much greater than those of other copolymers at surface pressures higher than 18 mN/m.

关 键 词：嵌段聚醚酯 Langmuir单分子膜 动态弹性 空气-水界面 

分 类 号：O631[理学—高分子化学]