Comparison of co-agents in peroxide-cured of thermoplastic vulcanized(TPV)

Styrenic thermoplastic vulcanizates (STPV) were developed for long-term high-temperatureapplications. These STPVs consist of polypropylene as the continuous phase and a crosslinkedhydrogenated styrene block copolymer (SEBS) as the dispersed phase. Effects of two co-curingagents, triallyl cyanurate (TAC) and bismaleimide (BMI) in a peroxide curing system for thepreparation of STPV are studied. The compound is prepared in an industrial-scale twin-screwextruder. Mechanical study reveals an increase in tensile strength, hardness (۱۵s) and elongation atbreak (from ۵.۹۲ to ۶.۸۹, from ۴۵ to ۵۶ and ۸۹۷% to ۱۰۸۲% respectively) of the STPV when usingBMI as a co-curing agent. Heat ageing study (۸۵ °C for ۱۶۸ h) and compression set (۷۰ °C and ۲۲ h,rest at ۷۰ °C) on the STPV, however, slightly was raised with using TAC co-curing agent comparedto BMI. The melt flow index (۱۹۰ °C, ۵ kg) is not changed with BMI co-agent.

کلیدواژه ها:

styrenic thermoplastic vulcanizates ، co-agent ، polypropylene ، twin extruder ، triallylcyanurate ، bismaleimide.