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A differential scanning calorimetric study of the interaction of zinc benzothiazole‐2‐thiolate, sulfur, stearic acid, and zinc stearate in the absence and presence of polyisoprene
Author(s) -
Luyt Adriaan S.
Publication year - 1993
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.1993.070471212
Subject(s) - stearic acid , zinc stearate , benzothiazole , zinc , vulcanization , sulfur , stearate , chemistry , organic chemistry , inorganic chemistry , polymer chemistry , natural rubber , raw material
The interactions between mixtures of zinc benzothiazole‐2‐thiolate (ZMBT), sulfur, stearic acid, and zinc stearate were studied by DSC in the absence and presence of polyisoprene (IR). It was established that ZMBT reacts with stearic acid to form zinc stearate and 2‐mercaptobenzothiazole (MBT). In the presence of stearate compounds, MBT is readily available from the start of vulcanization, whereas it becomes only slowly available in the absence of these compounds. The effectiveness of the vulcanization process increases for the systems IR/ZMBT/sulfur < IR/ZMBT/sulfur/stearic acid < IR/ZMBT/sulfur/zinc stearate. In view of the above results, interaction mechanisms are proposed for the different systems. © 1993 John Wiley & Sons, Inc.