动态光散射对良溶剂中酚醛型聚醚砜的研究

Dynamic Light Scattering Study on Solution Properties of Phenolphthalein Polyaryl Ether Sulfones in Good Solvent

用动态光散射方法研究了酚酞型聚醚砜（ＰＥＳ—Ｃ）在良溶剂ＤＭＦ中的稀溶液性质。在稀溶液中，ＰＥＳ—Ｃ分子由于内旋转发生链折叠，整体上表现出柔性链的性质，较好的符合球形模型；而分子链的局部刚性结构又使分子尺寸稳定；它的扩散行为随温度的变化符合Ａｒｒｅｈｎｉｕｓ方程。表征了ＰＥＳ—Ｃ分子在稀溶液中的形态结构，且给出了ＰＥＳ—Ｃ分子在ＤＭＦ中的扩散系数、扩散活化能、无限稀时的扩散系数和流体力学半径等重要特征参数。

The solution properties of phenolphthalein polyaryl ether sulfones(PES-C)in good solvent DMF have been studied by dynamic light scattering.The average decay rate is given by Γ=q￣2Dt. The results show that diffusion of PES-C molecule in the system fits rigid-ball model. We obtained the diffusion coefficient of PES-C molecule as a function of the concentration and temperature. The hydrodynamic radii for the particle in the good solvent was calculated by means of Stokes-Einstein equation.The diffusion activation energy has been obtained from Arrehnius function,and it is not associated with concentration.