Characterization of copolymers fractionated using supercritical fluids

摘要

AbstractIn this study supercritical fluids were used to process several different types of oligomers. Supercritical fluid processing was found to be quite effective at removing low vapor pressure monomers from polymers and for fractionation of polymers according to molecular weight. This resulted in high purity materials with lowM̄w/M̄nratios. The polymer fractions obtained were analyzed by size exclusion chromatography, differential scanning calorimetry, and melt rheometry. Their physical and chemical properties are describe