Phase Morphology and Mechanical Properties of Ethylene-Propylene-Diene-Monomer/Fluoroelastomer Blends

Abstract

Rubber blends based on ethylene-propylene-diene-monomer (EPDM) rubber and fluoroelastomer (FKM) having various blend ratios were prepared. The phase morphology, cure characteristics, hardness, tensile and dynamic viscoelastic properties of the blends were investigated. The cure rate of the blends increased, while the crosslink-density decreased as the FKM content increased. The hardness, tensile strength and elongation at break, and storage modulus (E') increased with increasing FKM loading. A typical incompatible blend behavior was found by observing two distinct tanδ peaks corresponding to EPDM and FKM. Based on the morphology investigation by scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDS) analyses, a typical 'sea-island' phase morphology was observed for the EPDM/FKM blends. As the FKM loading was increased to 50 phr, the EPDM was found to remain as the continuous phase. At the 80 phr of FKM, a co-continuous phase was observed and the phase inversion was observed at 90 phr of FKM.

Numerical Estimation of Bonding Force of EPDM Grommet Parts with Hollow Shaft Geometry

“…Physical properties related to the elasticity of rubber can generally be derived by standard test methods, such as ASTM D412-16 and KS M 6518 [11,12]. In addition, strain-stress data can be approximated through mathematical models, such as the Mooney-Rivlin model [13], Yeoh model [14], approximated through mathematical models, such as the Mooney-Rivlin model [13], Yeoh model [14], Gent model [15], and Ogden model [16][17][18][19][20]. The mathematically defined physical properties are applied to FEA and compared with the experimental results by using the mean square error technique.…”