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Complexes of tetramethylthiuram disulfide with zinc dialkyldithiocarbamates and their role in the sulfur vulcanization of natural rubber
Author(s) -
Ducháček V.,
Frenkel R.
Publication year - 1979
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.1979.070230716
Subject(s) - vulcanization , sulfur , zinc , natural rubber , disulfide bond , dithiocarbamate , chemistry , polymer chemistry , zinc sulfide , inorganic chemistry , chemical engineering , organic chemistry , biochemistry , engineering
Tetramethyl thiuram disulfide, which functions as an inhibitor of the zinc dialkyldithiocarbamate‐accelerated sulfur vulcanization, has been investigated by Mooney scorch measurements at 120°C and continuous measurements in a Vuremo curometer at temperatures from 100 to 140°C. The inhibition effect is due to the formation of a complex with zinc dialkyldithiocarbamate. The stability of the complex was calculated using the Hückel method which includes charge self‐consistency on the central atom. The calculations are in a good agreement with the experimental results which illustrate that tetramethylthiuram disulfide, unlike an actual prevulcanization inhibitor, plays a significant role in all the stages of vulcanization. It decreases the crosslinking rate and increases the ultimate extent of vulcanization and its activation energy.