The tear and wear resistance of silica filled thermoplastic polypropylene-natural rubber blend were found to increase with extent of dynamic crosslinking of the elastomer phase. Addition of silane coupling agent causes improvement in the failure properties of blends containing sulfur and sulfur-dicumyl peroxide [DCP] mixed vulcanizing systems and not in DCP containing blend. Scanning electron photomicrographs of the failure surfaces of the blends throw light on the mode of their failure.
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Kuriakose et al. (1986) studied this question.
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