Abstract
A detailed structural evaluation of a copolymer, or a resin exhibiting a branched structure, is only possible through the analysis of fractions from the parent resin. A description is given of a preparative GPC unit which operates at elevated temperatures and thus may be used in the structural analysis of a wide range of resin types including copolymers. Examples are given of the use of this preparative gel permeation chromatographic technique in the study of ethylene-vinyl acetate copolymers and styrene-butadiene rubbers. Through analysis of fractions by infrared, solution viscosity and analytical gel permeation chromatography, a comprehensive structural evaluation is derived which serves to illustrate the potential of preparative gel permeation chromatography in resin structure studies.
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