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Effect of carboxylic acids on 2‐bisbenzothiazole‐2,2′‐ disulfide‐ and tetramethylthiuram disulfide‐accelerated sulfur vulcanization. I. Reaction between the acids and accelerators
Author(s) -
McGill W. J.,
Shelver S. R.
Publication year - 1999
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(19990523)72:8<999::aid-app3>3.0.co;2-t
Subject(s) - vulcanization , chemistry , sulfur , stearic acid , disulfide bond , polymer chemistry , decomposition , sulfide , carboxylic acid , organic chemistry , natural rubber , biochemistry
Benzoic and stearic acids are shown to react with 2‐ bisbenzothiazole‐2,2′‐disulfide (MBTS) and its polysulfides (MBTP) at vulcanization temperatures to form acid‐accelerator complexes 2‐benzoylthiobenzothiazole (BzM) and stearicthiobenzothiazole (StM), respectively. At higher temperatures MBTS, MBTP, BzM, and StM are decomposed by the acids. Analogous reactions are observed with tetramethylthiuram disulfide (TMTD) and its polysulfides (TMTP). Lesser amounts of acid‐accelerator complexes 2‐benzoyldimethyldithiocambamate and stearicdimethyldithiocarbamate are formed, but TMTP are more susceptable to decomposition at higher temperatures. The destruction of MBTP and TMTP by carboxylic acids will reduce the concentration of accelerator polysulfides available in compounds, and should impact negatively on vulcanization. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 72: 999–1006, 1999