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Tetramethylthiuram disulfide and 2‐mercaptobenzothiazole as binary accelerators in sulfur vulcanization. III. Vulcanization of polyisoprene in the absence of ZnO
Author(s) -
Giuliani B. V. K. M.,
McGill W. J.
Publication year - 1996
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/(sici)1097-4628(19961114)62:7<1057::aid-app12>3.0.co;2-3
Subject(s) - vulcanization , sulfur , reaction mechanism , chemistry , swelling , polymer chemistry , disulfide bond , materials science , organic chemistry , natural rubber , catalysis , composite material , biochemistry
Polyisoprene was vulcanized with the binary accelerator system tetramethylthiuram disulfide–2‐mercaptobenzothiazole (TMTD–MBT) in the absence of ZnO. Samples were heated in a DSC at a programmed rate, the reaction was stopped at points along the thermal curve, and the system was analyzed. Extractable curatives and reaction intermediates were analyzed by HPLC and the crosslink density of samples measured by swelling. Two cross‐linking reaction sequences were identified, the first being initiated by polysulfides of the mixed accelerator N , N ‐dimethyldithiocarbamylbenzothiazole disulfide, and the second by MBT. All the TMTD is consumed in the first reaction sequence. Synergism of the reaction is discussed in terms of recent work detailing a reaction mechanism for TMTD‐accelerated vulcanization. © 1996 John Wiley & Sons, Inc.