Use of an oligomer as an internal standard in gel permeation chromatography

摘要

AbstractThe application of an oligomer as an internal standard in gel permeation chromatography was studied on narrow low molecular weight fractions of linear polyethylene usingn‐decane as the standard. A Waters gel permeation chromatograph was run continuously at 130°C with0‐dichlorobenzene as solvent. It has been found that the values of the elution volume of given samples vary with time and that a simple correction usingn‐decane as an internal standard reduces the inaccuracy from the original 6 to less than 1. The corrected elution volumes remain reproducible over a period of several months so that frequent calibration is eliminated. The use of the oligomer chemically similar to the polymer samples gives a much better result than the use of low molecular weight impurity as the st