Silver nanoparticles bridging segregated hexagonal boron nitride networks for enhancing the thermal conductivity of polystyrene composites. (October 2022) - Han, Gaojie
Abstract: The segregated heat conductive networks constructed from two-dimensional (2D) hexagonal boron nitride ( h BN) are promising in improve the thermal conductivity of polymer-based thermal management materials (TMMs), however, the high interfacial thermal resistance between adjacent h BN sheets remains challenging. Hence, high-performance polystyrene (PS)-based composites with continuous segregated h BN@AgNP networks were designed and prepared by hot-pressing method. Benefited from the modification and bridge effect of AgNP, the interconnected h BN exhibited significantly reduced contact thermal resistance, which provide the effective pathways for phonon conduction. The as-fabricated PS/ h BN@AgNP composite exhibited high thermal conductivity (1.17 and 1.53 W/mK, 30 wt%) corresponding to enhancements of 738.4% and 989.9% compared with neat PS, significantly higher than random PS/ h BN and composites without AgNP in the segregated structure. Therefore, this work provides a strategy for the preparation of high-performance polymer-based TMMs by reducing the interfacial thermal resistance in interconnected filler network. Graphical abstract: Image 1 Highlights: The h BN@AgNP hybrids were prepared by the in-situ chemical reduction of AgNO3 . PS-based composites containing continuous segregated h BN@AgNP networks were fabricated via hot-pressing process. The bridging effect of AgNP significantly reduces the interfacial thermal resistance of adjacent h BN. The PS/ h BN@AgNP composite showed enhanced thermal conductivity compared to random composite.