▎ 摘　　要

In electrical devices, mechanical characteristics are greatly required. In this study, graphene nanoplatelets were used to provide meaningfully enhanced electrical conductivity, dielectric constant, and mechanical properties in a polycarbonate (PC) matrix (GNP). This research supports a practical, cost-effective method for manufacturing dielectric, thermally stable polymer composites with superior mechanical properties. A thermogravimetric study was conducted on PC and PC/GNP composites in nitrogen and air atmospheres. In the presence of nitrogen, polycarbonate decomposed in a one-step manner, but in the presence of air, three-step deterioration was observed. Furthermore, pure graphene nanoplatelets degraded in three steps in air, associated with a moderate deterioration in N-2, as received. The inclusion of platelet-like graphene aided to produce a physical hindrance outcome, postponing the release of volatile chemicals created throughout breakdown, which enhanced the thermal strength of the composites. Polycarbonate/graphene nanocomposites' dielectric and electromagnetic interference (EMI) shielding characteristics were studied like a variable of composite shape and graphene particle size. The EMI shielding efficacy of polycarbonate content with 0.5wt% graphene was shown to be dependent on the composite shape and graphene content. Furthermore, the relative permittivity was seen to be increasing. The findings show that graphene-loaded polymers improve the functionality of electrical appliances, indicating that these materials could be used in electronic applications. The research demonstrates that adding GNP to a material may improve several characteristics while also making it lightweight and appropriate for a variety of applications.