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The effects of metal oxide (PbO) on covulcanization of the blend [carboxylated nitrile rubber (XNBR)–Polyacrylic rubber (ACM) = 50 : 50] in the presence of 2‐mercaptobenzothiazole (MBT) or ethylene thiourea (ETU) have been evaluated to elucidate the curing mechanism. The optimum mole ratio of ETU–PbO and MBT–PbO with respect to cure characteristics and physical properties have been found to be 1 : 1.5 and 1 : 0.5, respectively. The examination of infrared (IR) spectra reveals that crosslinking occurs at the CCl cure site of the ACM and COOH cure site of the XNBR. Based on the optimum mole ratios and Spectral analysis a scheme of reactions has been proposed.
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Chowdhury et al. (1995) studied this question.
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