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Influence of residual peroxide on the degradation of peroxide‐crosslinked ethylene–propylene–diene rubber
Author(s) -
Nakayama Kazumi,
Watanabe Tomoko,
Ohtake Yoshito,
Furukawa Mutsuhisa
Publication year - 2008
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/app.27894
Subject(s) - peroxide , epdm rubber , ethylene propylene rubber , materials science , natural rubber , diene , degradation (telecommunications) , organic peroxide , benzoyl peroxide , differential scanning calorimetry , fourier transform infrared spectroscopy , ethylene , polymer chemistry , composite material , chemistry , copolymer , chemical engineering , polymer , organic chemistry , monomer , catalysis , computer science , telecommunications , physics , engineering , thermodynamics
The influence of residual peroxide on the degradation of ethylene–propylene–diene rubber (EPDM) and detection methods for undercrosslinking were investigated. The undercrosslinking of peroxide‐crosslinked EPDM could be detected by the measurement of the heat generated by the crosslinking reaction due to residual crosslinking agent with differential scanning calorimetry, not by the determination of its amount, the reaction of which was found to correlate with the amounts of remaining dicumyl peroxide (DCP) and triallyl isocyanurate. As to the DCP‐crosslinked EPDM in the undercrosslinking state, softening degradation occurred more remarkably than hardening degradation, whereas the crosslinking agent remained in the rubber. By surface analysis of the aged DCP‐crosslinked EPDM with Fourier transform infrared spectroscopy, we discovered that the oxidative degradation of the undercrosslinked EPDM occurred faster than in the EPDM without crosslinking agent remaining. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008