Rheological Properties of Chopped Carbon Fiber-reinforced ABS Composites with Different Die Diameters

Introduction: Carbon Fiber (CF)-reinforced thermoplastic composites have been widely used in different structural applications due to their superior thermal and mechanical properties. Nitric acid-modified carbon fiber increases its surface roughness and improves the mechanical properties of the modified composite. Rheological properties have a significant influence on the molding of composite materials. Therefore, it is necessary to test the rheological properties of chopped-carbon-fiberreinforced ABS composites. Materials and Methods: The chopped carbon fiber with 65%-68% concentration of concentrated nitric acid reinforced Acrylonitrile Butadiene Styrene (ABS) composites (CF/ABS) were prepared by an internal mixer and two screw extruder machines in the paper. Results: The results show that when the die diameter was 1.0 mm, the influence on shear viscosity was relatively stable with changes in shear rate and temperature, and the "isothermal aging" method can be used to better visualize and predict the melt shear viscosity. The results of tensile viscosity calculated by the Cogswell method showed that the CF/ABS melt showed a phenomenon of "shear thinning" with increasing tensile strain rate. The tensile viscosity of pure ABS was the lowest, and the tensile viscosity of the composites increased significantly with the increase of CF mass. Discussion: The shear rheological properties and tensile rheological properties of chopped carbon fiber–reinforced ABS composites of different quality were analyzed using capillary die diameters of 0.5 mm, 1.0 mm, and 1.5 mm, respectively. conclusion: With the change of tensile strain rate and temperature, 1.0mm die melt was more likely to flow in tension, which was convenient for composites processing. Conclusion: With changes in tensile strain rate and temperature, the 1.0mm die melt was more likely to flow in tension, which was convenient for composite processing.