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Studies on a new binary accelerator system containing TMTD and amidinothiourea in sulfur vulcanization of natural rubber
Author(s) -
Mathew Cyriac,
Mini Varghese T. Elizabeth,
Kuriakose A. P.,
Francis D. Joseph
Publication year - 1994
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.1994.070540805
Subject(s) - vulcanization , natural rubber , sulfur , materials science , polymer chemistry , nucleophile , disulfide bond , polymer science , composite material , chemistry , chemical engineering , organic chemistry , catalysis , metallurgy , engineering , biochemistry
It is well known that the use of binary accelerator systems in rubber vulcanization provide better physical and chemical properties to the vulcanizates. The present work reports the results obtained on the study of amidinothiourea as a secondary accelerator along with tetramethyl thiuram disulfide (TMTD) in the sulfur vulcanization of natural rubber. Vulcanizates containing amidinothiourea have an appreciable increase in mechanical properties and better retention of these properties after aging compared to the reference mixes used. These mixes containing amidinothiourea showed appreciable reduction in optimum cure time as well. This suggests a nucleophilic reaction mechanism in the vulcanization reactions under review. Mixes with varying concentrations of amidinothiourea were tried; and the optimum level of amidinothiourea required has been derived based on the cure characteristics of the mixes and physical properties of the vulcanizates. © 1994 John Wiley & Sons, Inc.