𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Thiuram-accelerated sulfur vulcanization. IV. Zinc dimethyldithiocarbamate-accelerated sulfur vulcanization

✍ Scribed by M. Geyser; W. J. McGill

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
496 KB
Volume
60
Category
Article
ISSN
0021-8995

No coin nor oath required. For personal study only.

✦ Synopsis

SYNOPSIS

2,3-Dimethyl-2-butene (TME) was used as a model for polyisoprene in a study of zinc dimethyldithiocarbamate (Zn,(dmtc),) -accelerated sulfur vulcanization. Mixtures of T M E and curatives were heated in sealed tubes to 130Β°C for various times and the contents analyzed by HPLC. Zn2(dmtc),, in the presence of sulfur, reacts with T M E to form pendent groups of high sulfur rank. This reaction proceeds via a concerted mechanism without the formation of zinc perthiomercaptide as a true intermediate. Crossinking is slow but there is no induction period, the reaction between thiuram pendent groups of high sulfur rank being catalyzed by ZnP(dmtc),. Tetramethylthiourea is not formed.

πŸ“œ SIMILAR VOLUMES

The role of dimethyldithiocarbamic acid
The role of dimethyldithiocarbamic acid in accelerated sulfur vulcanization
✍ S. R. Shelver; M. Shumane; M. H. S. Gradwell; W. J. McGill πŸ“‚ Article πŸ“… 1999 πŸ› John Wiley and Sons 🌐 English βš– 137 KB πŸ‘ 1 views

Polyisoprene/tetramethylthiuram disulfide (TMTD)/sulfur compounds were vulcanized under a variety of conditions. TMTD does not decompose to tetramethylthiourea (TMTU) at vulcanization temperatures as has been suggested, neither is it formed as an integral part of the crosslinking process. Instead, i

Thiuram-accelerated sulfur vulcanization
Thiuram-accelerated sulfur vulcanization. I. The formation of the active sulfurating agent
✍ M. Geyser; W. J. McGill πŸ“‚ Article πŸ“… 1996 πŸ› John Wiley and Sons 🌐 English βš– 426 KB πŸ‘ 2 views

Mixtures of tetramethylthiuram disulfide (TMTD)/ZnO and TMTD/sulfur/ZnO were heated in a DSC to various temperatures. Zinc dimethyldithiocarbamate (Zn,(dmtc)J formed only in undried TMTD/ZnO mixes, the reaction being catalyzed by water on the ZnO surface. The presence of ZnO delays the decomposition