Highly Thermal Conductive Property of Polyamide-imide/Boron Nitride Composite Films by Doping Boron Nitride Quantum Dots
In this study, we reported a flexible polyamide-imide (PAI)/boron nitride nanosheets (BNNSs) composite film with improved thermal conductivity by doping boron nitride quantum dots (BNQDs) using evaporation-induced self-assembly method. Continuous thermal conductive paths are constructed by BNQDs and BNNSs in PAI matrix, and the heat flow is effectively transmitted along the paths to improve the in-plane thermal conductivity (TC) of the PAI composite film. Synergistic effect between BNNSs and BNQDs acts a pivotal part in the formation of continuous thermal conductive path. The PAI/BNNSs/BNQDs composite film shows the in-plane (TC) of 7.69 W·m-1·K-1 at BNNSs loading of 9 wt% and BNQDs loading of 1 wt%. This work provides valuable guidance for designing thermal management materials to meet the efficient heat dissipation in electronic devices.