Investigation of the properties of molybdenum disulfide (MoS₂) reinforced ethylene propylene diene monomer (EPDM) rubbers

Abstract

In this study, Ethylene Propylene Diene Monomer (EPDM) rubber was compounded with molybdenum disulfide (MoS₂), a solid lubricant, at three different loading levels (25, 55, and 90 phr) using a laboratory-scale 1.5-liter mini Banbury mixer. The effects of MoS₂ incorporation on the mechanical, rheological, and morphological properties of EPDM/MoS₂ composites were systematically investigated. The addition of MoS₂ at varying concentrations increased the torque values while reducing the scorch time. Notably, the incorporation of 90 phr MoS₂ led to a 26.21% increase in Mooney viscosity. Mechanical testing revealed that while tensile strength, elongation at break, elasticity, and tear resistance decreased with MoS₂ addition, abrasion resistance was significantly improved. Based on the overall findings, the EPDM composite containing 55 phr MoS₂ exhibited the most balanced and enhanced performance, making it the most promising candidate for high-performance EPDM-based composite applications.