This study mainly investigates the effect of talc and calcium
carbonate (CaCO3) as monotonic and hybrid fillers on the thermal,
mechanical and morphological properties of polypropylene (PP). The
hybrid composites, through the synergistic coalescence of positive
characteristics from both fillers, have exhibited exceptionally
good strength and toughness as compared to the monotonic
composites. The nucleating ability and high aspect ratio of talc
contributed towards the increment in strength while the isotropic
nature of CaCO3 enhanced the toughness of the hybrid composites.
Titanate surface treatments on talc and CaCO3 dramatically enhanced
the ductility of both monotonic and hybrid composites. The
composites were also subjected to natural weathering in Penang,
Malaysia for 6 months. After exposure, the mechanical properties of
monotonic composites deteriorated due to severe physical and
chemical degradation. However, the hybrid composites exhibited
better retention in mechanical properties albeit having undergone
some degree of surface-degradation. Filler surface treatments were
also effective in preventing further deterioration in composite
performance during natural weathering.
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