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Relaxation of stress in polypropylene and ethylene–propylene–diene elastomer blend vulcanizates at moderate and high extensions
Author(s) -
Sengupta Abhik,
Konar Bidyut Baran
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(19981212)70:11<2155::aid-app8>3.0.co;2-b
Subject(s) - polypropylene , materials science , ethylene propylene rubber , elastomer , composite material , relaxation (psychology) , stress relaxation , viscoelasticity , diene , polymer chemistry , vulcanization , glass transition , polymer science , natural rubber , copolymer , polymer , psychology , social psychology , creep
Measurements were made of the relaxation of the stress of stretched polypropylene (PP) and ethylene–propylene–diene elastomer blend vulcanizates at various strain levels. It was found that PP‐blended vulcanizates showed greater relaxation than that of the gum vulcanizate at all extensions. There was a continual increase in the relaxation rate with the 10% PP‐blended vulcanizate but an initial sharp decrease and then a flattening tendency with the above 10% PP‐blended vulcanizate at an increasing stain level. An interesting observation of the study was that the rate of stress relaxation decreased linearly in two steps in the case of blend vulcanizates above 10% PP at 100% and above strain levels. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 70: 2155–2162, 1998