高聚物溶液中大分子链尺寸的研究(Ⅲ)——一种测算高分子溶液第二维里系数的新方法

Studies on Polymer Chain Dimension in Solution ( Ⅲ ) --A New Method for Prediction of Second Virial Coefficient of Polymer Solution

将高聚物溶液中大分子链尺寸对浓度的依赖关系与Zimm 稀溶液第二维里系数的统计力学硬球模型相结合,借助聚合物的特性粘数、Mark-Houwink方程或分子量,计算聚合物-溶剂体系在稀溶液浓度范围内π/C或H·C/τ的模拟实验值.再以π/C或H·C/τ与浓度线型回归中的始斜率求体系的第二维里系数A_2,计算了30种聚合物-溶剂体系的295个不同分子量的A_2值,结果均与其实验值吻合较好,且明显优于其它理论模型测算的结果.

A method for prediction of second virial coefficient (A2) from intrinsic viscosity and Mark-Houwink equation or molecular weight has been proposed. The A2 values of 295 samples from 30 kinds of polymer/solvent systems (21 polymers and 12 solvents) calculated by this method are in quite good accordance with experimental results. And also, the model presented here is the best one for obtaining A2, compared with other theories and model.