物理化学学报 >> 1992, Vol. 8 >> Issue (01): 22-26.doi: 10.3866/PKU.WHXB19920106

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增溶甲苯对聚氧乙烯-聚氧丙烯嵌段共聚物胶团的影响

戴乐蓉; 吴佩强; 周祖康   

  1. 北京大学物理化学研究所，北京 100871
  • 收稿日期:1990-07-20 修回日期:1990-12-10 发布日期:1992-02-15
  • 通讯作者: 戴乐蓉

Effect of Solubilized Toluene on Micelle of Polyoxyethylene-Polyoxypropylene Block Copolymer

Dai Le-Rong; Wu Pei-Qiang; Zhou Zu-Kang   

  1. Institute of Physical Chemistry, Peking University, Beijing 100871
  • Received:1990-07-20 Revised:1990-12-10 Published:1992-02-15
  • Contact: Dai Le-Rong

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摘要： 用动态光散射, 测定聚氧乙烯-聚氧丙烯嵌段共聚物水溶液胶团增溶不同量的甲苯后, 其平均流体力学半径R_h的变化, 以及温度对它们的影响。实验结果表明, 25 ℃时胶团水化度高, R_h数值大, 增溶不同量的甲苯对R_h的影响较小。温度升高,胶团的水化度降低, R_h变小, 当温度接近浊点, 水化作用降至最低。因温度升高引起的胶团聚集数增加以及增溶的甲苯进入胶团内部的胀大作用, 使R_h随增溶量增加近于线性的上升。

关键词: 嵌段共聚物胶团, 增溶甲苯, 流体力学半径

Abstract: Effect of the amount of solubilized toluene on the hydrodynamic radius R_h of micelle of polyoxythylene(PEO)-polyoxypropylene(PPO) block copolymer was inves-tigated by dynamic lightscattering at different temperatures.
The result showed that the values of R_h were rather high due to strong hydration of PEO chains at 25 ℃, the amount of toluene in micelle had little effect on the values of R_h. As the temperature increased, hydration of micelle decreased and R_h decreased also. Near the temperature of the cloud point, the dehydration of micelle might be very strong, PPO core was swollen by toluent and aggregation number increased at higher temperatures, this made R_h increasing linearly with the amount of solubliized toluene.

Key words: Micelle of block copolymer, Solubilized toluene, Hydrodynamic radius