Abstract
Elastomer thermoplastics are a class of polymeric materials that received industry attention due to the possibility of joining the elastic of elastomers with the thermoplastics processability. The synergistic properties are linked to the appropriate processing. This study evaluated the effect of rotor speed during polymer mixing and the dynamic vulcanization process of polypropylene and nitrile rubber blends. Bismaleimide was employed as multipurpose agent (crosslinking coagent for peroxide and compatibilizer). Morphology, mechanical properties, compression set and oil resistance tests were evaluated for compositions containing 50 and 70 PHR of elastomer. The compatibilization of TPV was realized by infrared spectroscopy. It was shown a compatibilizer effect and better dispersion, achieving the inversion phase, only studying the effect of processing conditions (rotor speed, addition sequence, additives), without any extra interfacial agent. There is a tendency to obtain better performance with decrease speed at dynamic vulcanization or/and at torque stabilization, mainly for blends with 50 PHR of rubber.
Highlights
Thermoplastic vulcanizates (TPV) are compounds formed by thermoplastics such as Polypropylene (PP), Polyamide (PA), Polyethylene (PE) with elastomers such as Natural Rubber (NR), Ethylene Propylene Diene Rubber (EPDM) and Nitrile Rubber (NBR)[1,2,3,4]
After the networking formation, it has to be dispersed into thermoplastic matrix which may be favored by the increase in rotor speed
According to the results shown in this work, TPVs based on PP/NBR with morphology and reasonable properties were successfully achieved without the use of plasticizer or another compatibilizer agent, only studying the effect of processing conditions as the rotor speed
Summary
Thermoplastic vulcanizates (TPV) are compounds formed by thermoplastics such as Polypropylene (PP), Polyamide (PA), Polyethylene (PE) with elastomers such as Natural Rubber (NR), Ethylene Propylene Diene Rubber (EPDM) and Nitrile Rubber (NBR)[1,2,3,4]. The compatibilizer effect of BMI was suggested for PP/NBR blends by Soares group[10], BMI can do crosslinking coagent and compatibilizer In previous studies, it was reported the use of plasticizers to facilitate the processing of the rubber even in this TPV composition[10,11,12]. To the best of our knowledge, this work was the first to evaluate processing conditions of a TPV minimizing problems of incompatibility, focusing only in processing condition and parameters of dynamic vulcanization - without any other compatibilizing agents or plasticizers[8] It was shown by FTIR technique the interaction between PP and NBR provided by coagent. The torque rheometer curves supplied by internal mixers were used to determine the vulcanization and processing characteristics of elastomers compounds
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