Thermoplastic elastomeric blends of nitrile rubber and poly [styrene-co-acrylonitrile]. II. Replacement of Nitrile Rubber by its vulcinizate powder

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Abstract
A model waste nitrile rubber powder (w-NBR) was prepared by ambient grinding of aged NBR vulcanizate based on an oil seal formulation. The w-NBR was characterized by scanning electron microscopic and optical microscopic techniques. Virgin nitrile rubber in a thermoplastic elastomeric 70:30 nitrile rubber/poly(styrene-co-acrylonitrile) (SAN) blend was replaced by w-NBR, and the mechanical properties and swelling index were determined. The virgin NBR in the blend was replaced by the rubber present in w-NBR (r-w-NBR) and the optimum mechanical properties were achieved at 45% replacement where the blend was still reprocessable. Transmission electron microscopic and atomic force microscopic studies reveal that w-NBR particles coated with NBR are dispersed in a continuous SAN matrix. It was observed that migration of unreacted curatives from w-NBR to virgin NBR is not significant and incorporation of curatives is necessary for attainment of optimum level of mechanical properties.
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Author(s)
Anandhan, S
De, P
Bhowmick, A
De, S
Bandyopadhyay, Srikanta
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Publication Year
2003
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Journal Article
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UNSW Faculty