一、前言光散射技术是测定高聚物重均分子量、共聚物和混合物的组成以及高分子溶液一些热力学参数的重要方法之一。但其实验数据处理相当复杂,局限了光散射技术的应用。利用计算机处理光散射的实验数据,既可以提高速度,又可以提高准确度。对此,已有人进行了一些研究;但是,他们只是用最小二乘法进行数值运算。我们利用最小二乘法进行双重外推,计算出重均分子量、均方末端距、迥转半径、第二维里系数和高分子与溶剂小分子间的相互作用参数;并绘出了Zimm图,直观地描述双重外推及其结果。二、数学分析对于无规 I. Introduction Light scattering is one of the important methods to determine the weight average molecular weight, the composition of copolymers and mixtures and some thermodynamic parameters of polymer solution. However, its experimental data processing is quite complicated, which limits the application of light scattering technology. The use of computer processing of light scattering experimental data, both to improve speed, but also improve accuracy. In this regard, some studies have been carried out; however, they are just numerical calculations using the least square method. We use the least squares method to extrapolate the data to calculate the weight average molecular weight, the mean square end distance, the radius of gyration, the second virial coefficient and the interaction between the polymer and solvent molecules. The Zimm plot, Intuitively describe double extrapolation and its results. Second, mathematical analysis for random