Composite of polypropylene (PP) and high density polyethylene (HDPE) filled with durian seed flour (DSF) was investigated. All of the test samples (10-40 wt% filler loadings) were prepared using Brabender Plastograph EC internal mixer at temperature of 180°C, and moulded using compression moulding at temperature of 180°C. Results show that the toughness of DSF filled PP and HOPE composites increases with increasing filler loading, although the decrease in strength of the composite was evident. Based on the result, DSF filled PP composites was found to give better tensile properties compared to DSF filled HOPE composites, hence PP was chosen as the main matrix for the rest of the study. The composites properties were further enhanced with incorporation of calcium carbonate (CaC03) or corn starch, as hybrid filler to the DSF. The DSF/CaC03 and DSF/com starch hybrid ratio is studied at 0/40, 10/30, 20/20, 30/10 and 40/0 blend ratio. Both hybrid fillers were found to act as reinforcing fillers to the DSF. The adhesion of the filler and matrix was improved by using MAPP as a compatibilizer. Both addition of hybrid fillers and compatibilizer has improved the tensile properties as well as the thermal degradation properties of the composites. Scanning electron microscopy (SEM) characterization was also done to investigate the fracture surface behavior. Simple biodegradability test was conducted on each series of the composites, where FTIR analysis was done to determine the biodegradability of the composites. Results showed that all composites are subjected to biodegradation.
