✦ LIBER ✦

Tetramethylthiuram disulfide and 2-mercaptobenzothiazole as binary accelerators in sulfur vulcanization. III. Vulcanization of polyisoprene in the absence of ZnO

✍ Scribed by B. V. K. M. Giuliani; W. J. McGill

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 608 KB
Volume: 62
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19961114)62:7<1057::aid-app12>3.0.co;2-3

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✦ Synopsis

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 a t 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 crosslinking 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.

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