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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (9): 860-866. 上一篇    下一篇

研究论文

双亲三嵌段共聚物PEO-PPO-PEO在水溶液中相行为的理论研究

蒋润1, 金庆华*,1, 李宝会1, 丁大同1, 史安昌2   

  1. (1南开大学物理系 天津 300071)
    (2加拿大McMaster大学物理和天文系)
  • 投稿日期:2006-10-23 修回日期:2006-12-08 发布日期:2007-05-14
  • 通讯作者: 金庆华

Theoretical Study on the Phase Behavior of Amphiphilic Triblock Copolymers PEO-PPO-PEO in Aqueous Solutions

JIANG Run1; JIN Qing-Hua*,1; LI Bao-Hui1; DING Da-Tong1; SHI An-Chang2   

  1. (1 Department of Physics, Nankai University, Tianjin 300071)
    (2 Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada)
  • Received:2006-10-23 Revised:2006-12-08 Published:2007-05-14
  • Contact: JIN Qing-Hua

PDF

2378

被引次数

36 | 3

用自洽平均场理论的谱方法研究了双亲三嵌段共聚物PEO-PPO-PEO的分子量对其在水溶液相行为的影响. 理论预测了各种溶致液晶相的稳定区域. 通过系统地改变聚合物的分子量, 我们给出了各种PEO-PPO-PEO三嵌段共聚物在水溶液中的相图. 此外, 也研究了分子量对自组装结构各组分浓度分布的影响. 发现在给定的温度下, 聚合物的分子量是体系发生相分离的一个重要驱动力. 我们的理论结果与相关的实验很好地符合.

关键词: 自洽平均场理论, 三嵌段共聚物, 分子量, 相分离

The effects of the molecular weight on the phase behavior of amphiphilic triblock copolymers PEO-PPO-PEO in aqueous solutions were studied by using the self-consistent mean-field theory formulated in reciprocal space. The theoretical study predicted the stability ranges of various lyotropic liquid crystalline phases. By systematically varying the molecular weight, phase diagrams of several PEO-PPO-PEO triblock copolymers in water were constructed. Moreover, the effects of the block copolymer molecular weight on the volume fraction profiles for the components in the self-assembled structures were investigated. It was found that an increased molecular weight increased the segregation among the components at the given temperature. Good agreements were found between experimental results and theory.

Key words: self-consistent mean-field theory, triblock copolymer, molecular weight, phase segregation