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Elucidation of the Vulcanization Structures of Filled cis-1,4-Polybutadiene Rubber by Solid State Carbon-13 NMR Spectroscopy  

Kim, Su-Dong (Dept. of Polymer Science and Engineering, Chungnam National University)
Park, Eun-Kyung (Small and Medium Business Administration)
Ryu, Ju-Whan (Dept. of Polymer Science and Engineering, Chungnam National University)
Publication Information
Elastomers and Composites / v.43, no.4, 2008 , pp. 281-287 More about this Journal
Abstract
Using solid state $^{13}C$ NMR, polybutadiene rubber vulcanizates were qualitatively and quantitatively analyzed. In the filled conventional system of BR vulcanizate accelerated with TBBS, addition to the olefinic double bond and substitution in the $\alpha$ position to the double bond occurred simultaneously. Also the latter $\alpha$ substitution reaction was faster than the former addition reaction at initial reaction time. In addition, it was suggested that double bond-addition-polysulfide structures might be modified into 5-membered and 6-membered cyclic structures in overcure time. These chain modifications were correlated with the decrease in the chemical crosslink density in overcure time.
Keywords
Solid state NMR; BR; vulcanization; TBBS acceleration;
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