Gel Permeation Chromatography Procedures for the Determination of Molecular Weight Averages of Polyethylenes Used in Gas Distribution Piping-Resin Qualification. Topical Report, December 1989

摘要

The report describes the results of an investigation to determine molecular weight averages and distributions for commercial polyethylene fuel gas pipe materials using gel permeation chromatography. Results obtained from four different polymer testing laboratories varied by as much as a factor of three. An experimental technique has been developed that will give results with percent standard deviation of less than five percent for weight- and number-average molecular weights. The technique is explained in detail, and the data obtained in the study are summarized. The procedure may be used as an additional method for qualifying some of the important properties of PE gas pipe resins.