Engineering of Interfacial Interactions Among BN And CNT Hybrid Towards Higher Heat Conduction Within TPU Composites

•A novel two-step modification strategy is proposed such as the hydroxylation of both hybrid fillers BN and CNT, as well as the formation of strong urethane linkages between the filler-filler interfaces within the TPU composites.•The obtained outcomes not only exhibit high through-plane thermal conductivity (⊥TC 4.52 Wm-1K−1) at just 60 wt% loading of h-BN and 2 wt% of CNT but It also has outstanding tensile strength and Young's modulus of 11.5 MPa and 13.5 GPa respectively.