物理化学学报 >> 2004, Vol. 20 >> Issue (01): 38-42.doi: 10.3866/PKU.WHXB20040108

研究论文 上一篇    下一篇

球形嵌段共聚物胶束的温度效应

陆冬云;温浩;刘会洲;许志宏   

  1. 中国科学院过程工程研究所,北京 100080
  • 收稿日期:2003-06-19 修回日期:2003-08-29 发布日期:2004-01-15
  • 通讯作者: 陆冬云 E-mail:rainmoon@home.ipe.ac.cn

Temperature Effects on Block Copolymer Micelle Based on the Scaling Model

Lu Dong-Yun;Wen Hao;Liu Hui-Zhou;Xu Zhi-Hong   

  1. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080
  • Received:2003-06-19 Revised:2003-08-29 Published:2004-01-15
  • Contact: Lu Dong-Yun E-mail:rainmoon@home.ipe.ac.cn

摘要: 基于标度理论建立了嵌段共聚物溶剂体系的胶束模型,通过Flory-Huggins相互作用参数间接讨论了温度对胶束平衡性质的一般性影响.分析了胶束过渡区聚合物链的状态,通过分段的过渡区密度分布函数,考察了温度对聚集数、过渡区密度分布和胶束内外半径的影响.结果显示,温度升高使过渡区链状态呈现多种分层情况,并导致胶束聚集数的显著增加.但过渡区链状态的变化对过渡区密度的总体影响不显著,胶束的总体半径变化不大,表明过渡区溶剂随温度升高而逐渐“挤出”.理论预测与实验结果较一致.

关键词: 嵌段共聚物, 标度理论, 温度效应, 密度分布

Abstract: A model based on scaling theory was developed for the description of the diblock copolymer micelle system. The temperature effects on micelle equilibrium properties were investigated by the Flory-Huggins interaction parameter of polymer segment and solvent. By analysis of the chain-state in micelle corona, a multi-section density distribution function was proposed and the temperature effects on aggregation number, corona density distribution, micelle inner and outer radius were observed. The calculation results show that with increasing temperature, the change of chain-state in corona has little effect on the corona density, and the micelle aggregation number will rapidly increase with the slightly growing of the micelle radius, which implies the solvent squeezing from corona and the result is consistent with experiments.

Key words: Block copolymer, Scaling theory, Temperature effect, Density distribution