嵌段共聚物球形胶束体系的标度理论及其与均匀场理论的对比研究  

Scaling theory for block copolymer micelle system and its comparisons with mean field theory

作　　者：陆冬云[1] 温浩[1] 许志宏[1] 

机构地区：[1]中国科学院过程工程研究所,北京100080

出　　处：《计算机与应用化学》2005年第12期1089-1096,共8页Computers and Applied Chemistry

基　　金：国家自然科学基金资助项目(20273075;20303022;20221603)

摘　　要：本文建立了用于嵌段共聚物胶束体系定量计算的标度理论模型,讨论了标度理论与均匀场模型的差异。在极性和非极性溶剂体系中,定量考察了平衡态胶束聚集数、胶束过渡区聚合物浓度分布、胶束半径和内界面处的聚合物浓度等平衡性质, 以及嵌段共聚物嵌段比例、摩尔质量等因素对上述性质的影响。与实验及均匀场模型的对比结果显示,均匀场模型的拟均相假设对胶束聚集数等平衡性质的计算不会产生显著偏差,标度理论模型与均匀场模型都能够较好地描述胶束体系,两模型也获得了较好的一致。此外,标度理论模型能够给出胶束内的浓度分布。即使在高聚集数的情况下,胶束内界面处溶剂的含量仍然很高(>50％),这表明有必要对内界面张力的计算进行修正,而均匀场模型则忽略了此项修正。A quantitative Scaling theory model for block copolymer micelle calculations is developed, and the difference between which and the Mean Field theory （MFT） is discussed in this paper. In polar and non-polar solvent, quantitative calculations are performed and reviewed for the aggregation number, concentration profile of micelle corona, radius of micelle and concentration at inner interface of micelle, and their trends varying with the block proportion and molar mass. The comparisons to the experimental data and the MFT model show that the Scaling model is consistent with both of experimental data and MFT model, and Furthermore, presents the concentration profile of micelle corona. The comparisons suggest that there are no obvious deviations by the MFT model adapting the pseudophase hypothesis. The high solvent concentration （ 〉 50% ） at inner interface of micelle exists in the case of high aggregation number, which indicated that the modification on the interface free energy calculation should be performed. However, this modification is often ignored in the MFT model.

关 键 词：嵌段共聚物 标度理论 均匀场理论 胶束模型 

分 类 号：O6[理学—化学]