Highly thermally conductive polybenzoxazine composites based on boron nitride flakes deposited with copper particles

To solve the heat diffusion problem in electronic packaging, a novel kind of irregularly shaped hybrid filler, boron [email protected] ([email protected]), was successfully assembled via reduction of Cu2+. [email protected] hybrid fillers composed of different mass ratios between BN and Cu have been prepared and characterized. A specific [email protected] hybrid filler (mBN:mCu = 100:2), labeled as [email protected], exhibited remarkable ability in enhancing the thermal conductivity of polybenzoxazine (PBz) composites fabricated through ball milling followed by hot pressing. With 25 wt% of [email protected] hybrid fillers, the thermal conductivity of PBz composites reaches 1.049 W m−1 K−1. Dielectric properties, electrical conductivity, and curing behavior of the composites were also investigated. In addition, Foygel's thermal conduction model was employed to demonstrate the mechanism of [email protected] hybrid filler in improving thermal conductivity.