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Crystalline characteristics of ethylene/propylene/1,4-hexadiene terpolymers and related ethylene copolymers

✍ Scribed by C. K. Shih; E. F. Cluff

Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
592 KB
Volume
21
Category
Article
ISSN
0021-8995

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✦ Synopsis

An improved differential thermal analytical technique which permits the rapid, convenient characterization of the thermal behavior of crystalline polymers free of any influence of prior thermal history is presented. Characterization of both crystallization and fusion phenomena is described for ethylene/propylene copolymers subjected to well-controlled thermal scanning techniques. Parameters describing these phenomena are derived. While they are nonequilibrium parameters, they are reproducible and capable of correlation with polymer composition. The crystallization onset temperature determined by this cooling technique was found to relate to the molar ethylene content of the copolymers by an equation similar to the one derived by Flory5 based on equilibrium melting point. The relationship was found to hold true for a number of ethylene copolymers, including samples of linear and branched polyethylene, commercial EPDM, and ethylenehinyl acetate copolymers.

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