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A DSC study of curative interactions. III. The interaction of TMTM with ZnO, sulfur, and stearic acid
Author(s) -
Kruger F. W. H.,
McGill W. J.
Publication year - 1991
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.1991.070421004
Subject(s) - sulfur , stearic acid , vulcanization , eutectic system , chemistry , differential scanning calorimetry , decomposition , ternary operation , inorganic chemistry , polymer chemistry , natural rubber , organic chemistry , alloy , thermodynamics , physics , computer science , programming language
The interaction among various combinations of sulfur, tetramethylthiuram monosulphide (TMTM), ZnO, and stearic acid were studied by differential scanning calorimetry in the absence of rubber. Sulfur and TMTM reacted to form tetramethylthiuram disulphide, and the ternary eutectic mixture melted at about 80°C. The absence of the S γ → S μ transition in sulfur/TMTM mixes was related to a sulfur/TMTM interaction, wherein the eightmembered sulfur rings were opened at temperatures well below 170°C. The interaction of stearic acid with TMTM led to the decomposition of TMTM, but the reaction was largely suppressed when both ZnO and sulfur were present in the mixture. No evidence was found for the formation of a zinc‐accelerator complex of the type normally attributed a role in the accelerated sulfur vulcanization.