物理化学学报 >> 1990, Vol. 6 >> Issue (06): 693-698.doi: 10.3866/PKU.WHXB19900611

研究论文 上一篇    下一篇

SEP嵌段共聚物胶束化过程的热力学

周伟平; 贺智端; 张浩   

  1. 中国科学院长春应用化学研究所高分子物理开放实验室, 吉林 长春
  • 收稿日期:1989-09-26 修回日期:1990-05-14 发布日期:1990-12-15
  • 通讯作者: 周伟平

THE THERMODYNAMICS OF MICELLIZATION BY BLOCK COPOLYMER SEP IN ORGANIC SOLVENTS

Zhou Wei-Ping; He Zhi-Duan; Zhang Hao   

  1. Laboratory of Polymer Physics; Changchun Institute of Applied Chemistry; Academia Sinica; PRC.
  • Received:1989-09-26 Revised:1990-05-14 Published:1990-12-15
  • Contact: Zhou Wei-Ping

摘要: 本文对苯乙烯/氢化异戊二烯(简称SEP)二嵌段共聚物在混合溶剂正辛烷-苯中的胶束化过程作了深入研究, 建立了用小角激光光散射法测定共聚物在有机溶剂中的临界胶束浓度(CMC)的方法.研究结果表明, 嵌段共聚物在有机溶剂中的胶束化过程与小分子的表面活性剂在水中的胶束化过程有着明显的不同, 前者是熵减和放热过程。

Abstract: The thermodynamics of micellization for polystyrene-b-poly(ethylene/propylene) two-block copolymer(SEP) in the mixtures of n-octane and benzene with different proportions have been studied in this paper. The critical micelle concentrations(CMC) of micelle solutions at various temperatures were measured by low angle laser light scattering photometer(LALLS). The results show that the micellization process of nonpolar copolymer SEP in hydrocarbon solvents are exothermal, and the entropy change is negative. In contrast, for ordinary surfactants in water, it is the enthalpy contribution to the energy change which is responsible for micellization.