Abstract
Tearing behavior of blends of isotactic polypropylene (PP) and nitrile rubber (NBR) has been investigated with special reference to the effect of blend ratio and addition of compatibilizing agents. It has been observed that the tear strength of blends depends on the rubber concentration. Attempts have been made to correlate the tear strength with the morphology of the blends. Various composite models such as parallel model, series model, Halpin-Tsai equation and Coran's model have been used to fit the experimental values. The effect of addition of phenolic modified polypropylene (Ph-PP) as a compatibilizer on the tear strength of PP/NBR blend was investigated. The observed increase in tear strength with increase of Ph-PP concentration has been explained in terms of the reduction in particle size of dispersed NBR domains.
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