Styrenic thermoplastic vulcanizates (STPV) were developed for long-term high-temperature applications. These STPVs consist of polypropylene as the continuous phase and a crosslinked hydrogenated styrene block copolymer (SEBS) as the dispersed phase. Effects of two co-curing agents, triallyl cyanurate (TAC) and bismaleimide (BMI) in a peroxide curing system for the preparation of STPV are studied. The compound is prepared in an industrial-scale twin-screw extruder. Mechanical study reveals an increase in tensile strength, hardness (15s) and elongation at break (from 5.92 to 6.89, from 45 to 56 and 897% to 1082% respectively) of the STPV when using BMI as a co-curing agent. Heat ageing study (85 °C for 168 h) and compression set (70 °C and 22 h, rest at 70 °C) on the STPV, however, slightly was raised with using TAC co-curing agent compared to BMI. The melt flow index (190 °C, 5 kg) is not changed with BMI co-agent.

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