Investigation of the effects of magnetic additive cobalt/carboxyl functionalized multi-walled carbon nanotubes for enhancing the machinability of polycarbonate composites under magnetic field

Abstract

Polycarbonate (PC) has been widely applied in various industrial areas including biomedical, optical, and defence systems. According to the optical requirements of PC devices, a high-quality surface with better surface finish and transparency are necessary. However, due to the mechanical property of PC, poor surface finish due to tool marks generated during machining [1]. In this paper, a novel fabrication process is presented for enhancing the machineability in terms of higher ductility of PC without significant loss of transparency by mixing with cobalt/carboxyl multi-walled carbon nanotubes (Co/COOH-MWCNTs). Carboxyl worked as a bridge between Co and PC chain, under a magnetic field, Co caused the movement of PC chains, and connect better with polymer chains. Experimental investigations show that a low concentration of Co/COOH-MWCNTs can increase the ductility of PC by fibre reinforcing effects. The experimental results provide promising guidance for enhancing the machinability of PC by appropriate concentration of the additive.