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Kinetics of Nitration of cis-1,4-Polybutadiene Rubber in Solution with Nitrogen Dioxide

The kinetics of nitration of cis-1,4-polybutadiene rubber dissolved in dichloroethane in the range of concentrations up to 2.2% was studied in a stirred cell. It was found that diffusion of nitrogen dioxide is not important and the reaction is of the first order with respect to both reactants. The overall second-order reaction rate constant was found to be about 1.1×10−5l/(gmol sec) at 303K. The obtained value for the activation energy corresponds to kinetic regime. Based on these results a reaction mechanism is proposed.