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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。
Dynamic light scattering was used to measure the average hydrodynamic radius (R_h) of the poly (oxyethylene-polyoxypropylene) block copolymer micelles and the effect of temperature on their solubilities. The experimental results show that the gelatinization degree is high at 25 ℃, the value of R_h is large, and the effect of different amount of toluene on R_h is small. When the temperature rises, the degree of hydration of the micelles decreases and R_h becomes smaller. When the temperature approaches the cloud point, the hydration is minimized. The increase of the number of micelles due to the temperature increase and the swollen effect of solubilized toluene into micelles make the R_h increase with the increase of the amount of solubilization near the linear increase.