Abstract
This paper describes a single-step, quantitative method for hydroxylation of unsaturated rubbers like EPDM. The resultant polyhydroxy elastomer was vulcanised using a diisocyanate under relatively milder conditions. The vulcanised product showed increased modulus in contrast to the sulfur- or peroxide-crosslinked systems. The enhanced cohesion originates from the urethane linkages which can be controlled either by regulating the concentration of the oxidant during hydroxylation or through the isocyanate –to- hydroxyl ratio (NCO/OH) during vulcanisation. This is the first ever report on the mid chain hydroxylation of unsaturated polymers and their polyurethane networks.
The unsaturation in EPDM rubber was hydroxylated by aqueous potassium permanganate and subsequently reacted with a diisocyanate to derive polyurethane network with enhanced cohesion.
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Nair, C.P.R., Shukla, S. Hydroxylation of EPDM as a means for ambient temperature vulcanisation via urethane chemistry. J Polym Res 26, 84 (2019). https://doi.org/10.1007/s10965-019-1743-3
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DOI: https://doi.org/10.1007/s10965-019-1743-3