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Dynamic mechanical behavior analysis for low ethylene content polypropylene copolymers
Author(s) -
Feng Y.,
Jin X.,
Hay J. N.
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19980418)68:3<395::aid-app7>3.0.co;2-e
Subject(s) - copolymer , ethylene , polypropylene , ethylene propylene rubber , materials science , natural rubber , polymer chemistry , relaxation (psychology) , epdm rubber , dynamic mechanical analysis , enthalpy , composite material , polymer , thermodynamics , chemistry , organic chemistry , catalysis , physics , psychology , social psychology
Dynamic mechanical behavior of low ethylene content propylene–ethylene copolymers was studied. It was found that there exists ethylene‐propylene rubber component in the block copolymer, which is accordance with the component analysis. It is suggested that it is because of the existence of the ethylene–propylene rubber component that the block copolymer exhibits high impact strength. The relaxation temperature shifted to lower temperature for copolymers compared with homopolymer, and the damping peak was broadened by copolymerization, consistent with the increased chemical heterogeneity of the copolymers. Effects of thermal history and frequency on the relaxations were studied. The activation enthalpy for relaxation was determined. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68:395–401, 1998