Abstract
The tensile and impact properties of poly(l-lactic acid) composites filled with nanometer calcium carbonate (nano-CaCO3) were measured at room temperature. The results showed that the tensile elastic modulus increased roughly linearly while the tensile yield strength, tensile fracture strength and tensile elongation at break (δ b ) decreased nonlinearly with increasing the nano-CaCO3 weight fraction (W f ); when W f was constant, the δ b increased with increasing tensile rates. Both the V-notched Izod impact strength and V-notched Charpy impact strength showed the non-linear increase with increasing W f . The impact fracture surface was observed by means of a scanning electronic microscope to understand the toughening mechanisms.
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