Abstract
This study aims to investigate the mechanical behaviour of the polypropylene/devulcanized natural rubber (PP-DeVulcNR) compound upon natural weathering. The DeVulcNR was used to improve the mechanical properties of the PP-DeVulcNR compound at the range of 0 – 20 phr. These samples were subjected to natural weathering test at a duration range of 0 – 6 months to further study the weatherability of the compound. It was found that with the addition of 5 phr DeVulcNR in PP has the highest weatherability as it has obtained the optimum value of the tensile strength after 6 months outdoor exposure. Besides that, there is more fibrils formation on the fractured surface due to better dispersion of DeVulcNR particles in PP matrix. The Young’s Modulus and elongation at break of the PP-DeVulcNR compounds reduced after 6 months outdoor exposure due to the embrittlement of the materials. The presence of the hydroxyl (O-H) and carbonyl (C = O) stretching vibration indicated that the photo-oxidation occurs in the compound during outdoor exposure.
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