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Thermoplastic ionomers based on "styrene grafted natural rubber"

Graft copolymer of natural rubber was prepared by polymerizing styrene in natural rubber latex using tertiarybutylhydroperoxide and tetraethylenepentamine through emulsion polymerization. Natural rubber thus reinforced by grafting styrene onto the hydrocarbon backbone was further converted to the ionomer by sulfonating with acetyl sulfate, followed by neutralization of the polymersulfonic acids using zinc acetate in methanol. The "zinc sulfonated styrene grafted natural rubber" designated as x.yZnS-SGNR where x.y shows number of milliequivalents of sulfonic acid/100 g of SGNR, behaves like a thermoplastic elastomer. It shows improved stress-strain properties as compared to the host polymer, styrene grafted natural rubber (SGNR). The modified samples of styrene grafted natural rubber of different sulfonic acid concentrations were prepared and evaluated using X-ray Fluorescence Spectroscopy (XRFS), Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICPAES), Fourier Transform Infrared Spectroscopy (FTIR), Nuclear Magnetic Resonance Spectroscopy (NMR), Thermogravimetric Analysis (TGA), and by the measurement of physical properties.