METHOD FOR DETERMINING THE WEIGHT-AVERAGE MOLECULAR WEIGHT OF A WATER-SOLUBLE HIGH MOLECULAR WEIGHT POLYMER

摘要

The invention concerns a method for determining the weight- average molecular weight of a water-soluble high molecular weight polymer, said method comprising the following steps: a) Providing a Size Exclusion Chromatography column connected to a Multi Angle Light Scattering and Differential Refractive Index detectors; b) Providing water as mobile phase of said Size Exclusion Chromatography column; c) Injecting said polymer into said mobile phase of said Size Exclusion Chromatography column; d) Measuring the weight- average molecular weight of said polymer with the Multi Angle Laser Light Scattering and Differential Refractive Index detectors; wherein the flow rate of said mobile phase is lower than 0.20 mL/min, in particular is from 0.05 mL/min to 0.20 mL/min, more particularly from 0.10 mL/min to 0.15 mL/min.