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

2008

Using solid state 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 position to the double bond occurred simultaneously. Also the latter 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.

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