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Aromatic rings as cure sites for EPM elastomers
Author(s) -
Holmquist H. E.,
Proskow S.,
Barney A. L.
Publication year - 1971
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.1971.070150905
Subject(s) - degree of unsaturation , vulcanization , polymer chemistry , elastomer , halide , curing (chemistry) , ethylene propylene rubber , ethylene , double bond , natural rubber , materials science , aromaticity , polymer , chemistry , organic chemistry , molecule , copolymer , catalysis
Terpolymers of ethylene and propylene with 4‐phenyl‐, 4‐ o ‐tolyl, 4‐ p ‐tolyl, and 4‐(1‐naphthyl)‐1‐butenes were vulcanized with bisbenzylic halides in the presence of highly acidic clays. The halides include bischloromethyldurene, p ‐bischloromethylbenzene, and p ‐bisbromomethylbenzene. Since the polymers contain no olefinic unsaturation, the crosslinking is achieved by electrophilic attack of the halide on the pendant aromatic rings. The order of activity is naphthyl > tolyl > phenyl. The new curing system also reacts with olefinic unsaturation. Thus, an EPDM elastomer and SBR rubber, the latter containing both aromatic rings and double bonds, were also readily crosslinked.