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The effect of extraction and rubber purity on the stress relaxation of dicumyl peroxide vulcanizates
Author(s) -
Dunn J. R.
Publication year - 1963
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.1963.070070432
Subject(s) - autocatalysis , natural rubber , peroxide , stress relaxation , extraction (chemistry) , antioxidant , materials science , acetone , relaxation (psychology) , curing (chemistry) , chemistry , polymer chemistry , composite material , organic chemistry , catalysis , biology , creep , neuroscience
The oxidative stress relaxation of peroxide vulcanizates of various grades of natural rubber has been investigated at 100°C. The rubbers were examined both with and without hot acetone extraction before or after cure. Highly purified rubber vulcanizates exhibited autocatalytic relaxation, but those based on crêpe or smoked sheet did not, because they retained natural antioxidant even after extraction. Autocatalysis was no longer found in extracted purified rubber vulcanizates if these were prepared from a mix containing phenyl‐β‐naphthylamine. The presence of such an antioxidant reduced network scission but had less effect upon the amount of crosslinking taking place during aging.