Dimensional synergy in 3D thermally conductive boron nitride/polymer composites

Three-dimensional (3D) thermally conductive boron nitride (BN)/polymer composites show significant potential in the field of thermal management. This review surveys current advances and discusses the thermal conductivity mechanisms of BN/polymer composites and the critical factors influencing their performance. A thorough introduction to the construction methods of 3D thermally conductive BN/polymer composites is provided, along with an objective discussion of their advantages and disadvantages. Notably, this review specifically highlights the effects of 3D thermally conductive networks on phonon transmission, interfacial thermal resistance, and thermal conductivity, as well as their interactions, and points out recent innovative trends in constructing 3D thermal composites by integrating BN with other dimensional fillers (0D, 1D, and 2D fillers). These approaches demonstrate promising strategies for optimizing thermal management by leveraging the unique advantages of each dimensional filler. The review concludes with a summary and outlook on the development of 3D thermally conductive BN/polymer composites. This aims to provide theoretical analysis, advance practical applications, and enhance next-generation thermal management systems.