Abstract
EPDM (Ethylene propylene diene monomer) is one of synthetic rubber that widely used in automotive. It must be vulcanized and added by other materials before used. The aim of this study is to investigate the effect of vulcanization system and the addition of carbon black (CB) to the mechanical properties and swelling characteristic of EPDM. This research used three vulcanization system, conventional vulcanization (CV), efficient vulcanization (EV) and semi-efficient vulcanization (SEV) with the variation of carbon black 50, 60, 70 phr (per hundred resin). This research showed that EV system resulted faster vulcanization time and lower delta torque than SEV and CV systems. This system also performed the highest tensile strength, elongation, and tear strength, while SEV system resulted the highest hardness. Furthermore, the conventional vulcanization system resulted the lowest swelling index.
Highlights
Ethylene-Propylene-Diene-Rubber (EPDM)is a type of synthetic rubber which has a good resistance to chemical, weathering, and aging
Sulphur vulcanization systems are classified as efficient (EV), semi-efficient (SEV), and conventional (CV)
Conventional vulcanization system (CV) has a low ratio of accelerators to sulphur (0.1 to 0.6), which produces a high percentage of polysulfidic, while the semi-efficient vulcanization system (SEV) is in between of them, which is characterized by the moderate ratio of accelerators to sulphur (0.7 to 2.5) (Dijkhuis et al, 2009)
Summary
Ethylene-Propylene-Diene-Rubber (EPDM)is a type of synthetic rubber which has a good resistance to chemical, weathering, and aging. Sulphur vulcanization in EPDM allowed by the diene-monomers in the main chain (Dijkhuis et al, 2009; Nabil et al, 2013). Sulphur vulcanization systems are classified as efficient (EV), semi-efficient (SEV), and conventional (CV). Efficient vulcanization system (EV) is characterized by a high ratio of accelerators to sulphur (> 2.5) which produces a high percentage of monosulfidic in the formation of the crosslink. Conventional vulcanization system (CV) has a low ratio of accelerators to sulphur (0.1 to 0.6), which produces a high percentage of polysulfidic, while the semi-efficient vulcanization system (SEV) is in between of them, which is characterized by the moderate ratio of accelerators to sulphur (0.7 to 2.5) (Dijkhuis et al, 2009).
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