Abstract: In this paper, based on melting experiments of Acrylonitrile-Butadiene-Styrene Copolymer-toughening carbon fiber/polycarbonate composite materials in micro twin-screw extruder, the rheological behavior of PC/CF/ABS blends was studied during melting process, the effects of CFs content and ABS content on mechanical properties of PC/CF/ABS blends and the mechanism of variable viscosity and mechanical properties were studied, the mechanism of the change of viscosity and the mechanical properties were also discussed. The results showed that when CF content was 2%, the minimum of non-Newtonian value was obtained, meanwhile, the mechanical properties and processing properties of composite were outstanding. Above all, when CF content was 2%, ABS content was between 30% ~ 35%, the mechanical properties and good processing properties of the PC/CF/ABS composites were obtained. Scanning electron microscopy analysis showed: the tensile failure of composites was mainly interface degumming, and the impact failure of composites was mainly fiber breakage. Compared with PC/CF composites, the ratio of tough fracture of PC/CF/ABS composites increase, it shows that the mechanical properties of composites improved.

Key words: polycarbonate, carbon fiber, acrylonitrile-butadiene-styrene copolymer, toughening