Complexes of tetramethylthiuram disulfide with zinc dialkyldithiocarbamates and their role in the sulfur vulcanization of natural rubber

✍ Scribed by V. Ducháček; R. Frenkel

• Publisher: John Wiley and Sons
• Year: 1979
• Tongue: English
• Weight: 310 KB
• Volume: 23
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1979.070230716

✦ Synopsis

Abstract

Tetramethyl thiuram disulfide, which functions as an inhibitor of the zinc dialkyldithiocarbamate‐accelerated sulfur vulcanization, has been investigated by Mooney scorch measurements at 120°C and continuous measurements in a Vuremo curometer at temperatures from 100 to 140°C. The inhibition effect is due to the formation of a complex with zinc dialkyldithiocarbamate. The stability of the complex was calculated using the Hückel method which includes charge self‐consistency on the central atom. The calculations are in a good agreement with the experimental results which illustrate that tetramethylthiuram disulfide, unlike an actual prevulcanization inhibitor, plays a significant role in all the stages of vulcanization. It decreases the crosslinking rate and increases the ultimate extent of vulcanization and its activation energy.