【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。更多还原

【Abstract】 Effect of the amount of solubilized toluene on the hydrodynamic radius R_h ofmicelle 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 hydrationof PEO chains at 25℃, the amount of toluene in micelle had little effect on thevalues of R_h. As the temperature increased, hydration of micelle decreased and R_hdecreased also. Near the temperature of the cloud point, the dehydration of micellemight be very strong, PPO core was swollen by toluene and aggregation numberincreased at higher temperatures, this made R_h increasing linearly with the amountof solubliizde toluene.更多还原