Tailoring Interfaces and Networks in Functionalized Graphene‐Carbon Fiber Reinforced Polyamide Composites for Enhanced Thermal and Mechanical Properties

ABSTRACT Optimized interfacial compatibility and uniform filler dispersion within the matrix are the key factors for enhanced thermal conductivity and mechanical performance in polymer composites. Herein, a dual‐filler dispersion strategy is proposed to successfully develop high‐performance polyamide‐6–based carbon fiber composites. By incorporating 1 wt% functionalized graphene nanoplatelets (FG) as a functional filler, the dispersion and interfacial bonding of the FG are significantly improved. The results demonstrated that the through‐plane thermal conductivity of carbon fiber composites reached 1.03 W·m ⁻¹ ·K ⁻¹ , which is 5.15 times higher than that of the matrix. Additionally, the Young's modulus of the composites increases to 2037 MPa, representing a 135% improvement over the matrix, thus achieving a synergistic enhancement of both thermal and mechanical properties. The findings of this research provide new theoretical foundations and technical pathways for the development of high‐performance thermally conductive composites.