Abstract
The effect of carbon black on mechanical properties of polycarbonate and polycarbonate-polypropylene blends was investigated. Experimental work included compounding with a single screw extruder, injection molding of test specimens, and evaluation of the blends physical properties using standard testing instruments. The results showed that carbon black increased tensile strength, tensile modulus, and flexural modulus. However, it decreased elongation at break, impact strength, and toughness. The increase of polypropylene concentration in the blends decreased their tensile strength, tensile modulus, elongation at break, impact strength, and toughness. The effects of polypropylene on tensile modulus and strength were discussed using a model containing a continuous polycarbonate phase enriched by carbon black and polypropylene minor phase with little interfacial interaction between two polymers. Values of the impact strength and the toughness of blends with different compositions were found to correlate by one curve.
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