Polymer and Materials Science
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
The glass transition temperatures of polypropylene, poly-1-butene, polyisobutylene, and an ethylene-propylene (EP) copolymer have been determined by inverse gas chromatography. The results are consistent with those determined by other procedures. When applied to low-, medium- and high-density polyethylene, values of -35, -25, and -18°C, respectively, were obtained. Because of the fact that the chromatographic technique involves essentially a sensitive detection of free volume in a polymer, it is suggested that these values represent Tg if it is defined as an iso-free volume state of the amorphous phase of the polyethylene.
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