Richard Laine

Gel Permeation Chromatograph

Location: 2510 GG Brown Connector

This device uses a column chromatography technique employing as the stationary phase a swollen gel made by polymerizing and cross-linking styrene in the presence of a diluent which is a nonsolvent for the styrene polymer. The polymer to be analyzed is introduced at the top of the column and then is elutriated with a solvent. The polymer molecules diffuse through the gel at rates depending on their molecular size. As they emerge from the bottom of the column they are detected by a differential refractometer from which a molecular size distribution curve is plotted.