Processing and Characterization of Recycled Polypropylene and Acrylonitrile Butadiene Rubber Blends |
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Authors: | Jobin Jose A Nag G B Nando |
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Institution: | (1) Department of Chemistry, Indian Institute of Technology, Kharagpur, 721302, India;(2) Rubber Technology Center, Indian Institute of Technology, Kharagpur, 721302, India; |
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Abstract: | In this paper investigation on thermoplastic elastomers (TPE) and thermoplastic vulcanizates (TPV) derived from waste polypropylene
(WPP) of Municipal Solid Waste (MSW) and acrylonitrile-butadiene rubber (NBR) are reported. The WPP was segregated, cleaned,
dried and melt processed with NBR at 180 °C in a Brabender Plasticorder at different blend ratios. TPV was prepared by dynamic
vulcanization of the TPE with conventional sulfur accelerator curing system. The mechanical properties measured were found
to decrease with increase in NBR proportion in the blend; however the dynamic vulcanization of the nitrile rubber phase enhanced
the strength properties of the corresponding TPE. The crystallinity of the WPP reduced with increase in NBR ratio. The dynamic
modulus decreased with nitrile rubber content in the TPE. Interestingly, the storage modulus of the TPV at higher rubber content
enhanced significantly and damping characteristics increased sharply. The rheology studies reveal that the damping of the
blend has been reduced with the addition of high storage modulus rubber at melt processing conditions and hence increased
viscosity. The amorphous rubber content with higher storage modulus imparts higher viscosity for the polypropylene (PP) matrix
at the processing temperature. The SEM study reveals that the dynamic vulcanization of the rubber phase in the blend caused
a smoother and finer surface morphology. |
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