2. Trimethylolpropane Trimethacrylate. — The rate of peroxide vulcanization of NR in the
presence ofTMPTMAat 160 8Cwas calculated from kinetic data47 (1.673103 s1) and was found
to be relatively low compared with the high reaction rate of the methacrylic groups. This indicates
that the reactions of the methacrylic group of coagents are the radical-addition type. Comparison of
FTIR spectra of cured (NR–DCP) vulcanizate and those with coagentTMPTMA(Figure 5) showed
that, during vulcanization, coagent molecules are incorporated into the network. The broad and
intense absorption band present in the FTIR spectrum of pure TMPTMA at 1718 cm1 (ester group