Abstract: Composites of PP reinforced with SCM whiskers were prepared in a co-rotating twin-screw extruder, followed by injection molding. The whiskers were surface treated with coupling agent-A151 prior to blending. The tensile, bending, and impact strengths of the injection molded samples were investigated. When the mass ratio of PP/whisker was 80/20 and the content of coupling agent was 2 mass% based on whisker, the tensile, bending, and notch impact strengths reached optimal values.

Key words: silicon calcium magnesium whisker, co-rotating twin-screw extruder, polypropylene, coupling agent