Studies on a New Antireversion Agent for Sulfur Vulcanization of Diene Rubbers

• DOI: 10.5254/1.3538397
• Publication Date: 2011-02-16T23:21:06Z
• Authors: A. H. M. Schotman; P. J. C. van Haeren; A. J. M. Weber; F. G. H. van Wijk; J. W. Hofstraat; A. G. Talma; A. Steenbergen; R. N. Datta
• Keywords: 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 0104 chemical sciences

Abstract The mechanism of biscitraconimides (BCI) as antireversion agents for sulfur vulcanized diene rubber was investigated choosing squalene as a model substrate. Curing of squalene with sulfur in the presence of accelerator, activator and BCI at 170°C gave BCI bridged adducts. The products were identified by spectroscopic methods as being results of a Diels-Alder reaction of BCI (dienophile) with conjugated polyenes that are formed as a result of reversion. The rate at which the sulfur network degrades is comparable to the rate in which BCI adduct is formed. As a result of this, a nearly constant crosslink density is obtained after optimum cure time (t90). Based on this concept, the advantage of using 1,3-bis-(citraconimidomethyl) benzene (BCI-MX), a representative of the BCI-class, in NR based compounds is examined.