Synergistic Effects of Thermally Conductive Networks on Polymer Properties

Abstract With the rapid development of 5G communication and electronic manufacturing technologies, and other fields, the performance of products has improved, and thermal conductivity of materials demands have increased significantly. In this study, using a two-step method, hybrid filler networks were constructed in a polyurea (PUA) matrix with different filler ratios (aluminum nitride (AlN) and boron nitride (BN)), and the synergistic effects of the as-obtained thermal conductivity networks were investigated. The thermal conductivity of the hybrid filler/PUA composites was better than when a single filler was used. The thermal conductivity was maximum (54.24% higher) when the mass ratio of AlN : BN was 5 : 5, and the material had good heat resistance (Tg = 188°C), high tensile strength (12 MPa), and elongation at break (400%). The developed low-cost, high-performance hybrid composite filler has excellent application prospects for practical applications.