高分子溶液体系的自扩散系数的NMR测量(英文)

THE MEASUREMENT OF SELF - DIFFUSION COEFFICIENTS OF POLYSTYRENE SOLUTIONS BY NMR

用核磁共振方法测量高聚物体系的自扩散系数是一种有效而直接的方法。本文报告了用核磁共振方法测量高分子在溶液中自扩散系数实验方法的研究结果,并对聚苯乙烯良溶液体系和θ溶液体系的自扩散现象进行了研究和比较,为半浓溶液范围的de-Gennes的“蠕动”理论提供了实验验证。

The self-diffusion coefficients of polystyrene (PS) dissolved in CCl_4 and in CCl_4+D_3COD at 8 condition were measured by the spin echo pulsed field gradient method. The dependence of the measured self-diffusion coefficient on concentration and molecular weight was proved basically to follow the scaling law of the rcptation model by de-Gennes.