| Abstrakt: |
In an internal mixer, natural rubber / ethylene propylene diene monomer (NR/EPDM) rubber blend was compounded with onium modified montmorillonite (organoclay), and the mixture was then vulcanized using a traditional crosslinking system (sulphur-based crosslinker). In this work, a compatibilizer consisting of epoxidized natural rubber (ENR) with 50 mol percent epoxidation (ENR 50) in 10 phr (parts per hundred rubber) was utilised. Two commercial fillers were utilised for comparison: silica (SiO2, grade: vulcasil-S) and carbon black (CB: grade-N330, high abrasion furnace (HAF)). On a Monsanto MDR2000 Rheometer, cure properties were measured. The lowest values for torque minimum (Ml), torque maximum (Mh), scorch time (ts2), and optimum cure time (tc90) were found in the organoclay (OC) filled vulcanizate. Tensile and tear strength properties of the NR/EPDM composites were determined during mechanical testing. In comparison to SiO2 and CB filled composites, the improvement of elongation at break, tensile strength and tear strength characteristics in OC filler-filled vulcanizates was much developed. OC demonstrated the maximum stiffness in terms of reinforcing effectiveness, followed by SiO2 and CB loaded composites. The failure mechanism of the resulting NR/EPDM composites has been changed as compared to the gum vulcanizates, according to scanning electron microscopy. [ABSTRACT FROM AUTHOR] |
