Thermal Conductivity Hydroxylated Boron Nitride/Polyurethane/Polyvinyl Alcohol Composite Nanofiber Film Prepared by Electrospinning

Abstract As functional composite materials rapidly develop, the insufficient thermal conductivity of polymer materials to meet application requirements is becoming increasingly apparent. In this work, electrospinning is employed to prepare hydroxylated boron nitride nanosheet (OH‐BNNSs)/water‐based polyurethane (WPU)/polyvinyl alcohol (PVA) composite nanofiber membranes with good thermal conductivity. When the content of OH‐BNNSs is 10 wt.%, the thermal conductivity of the OH‐BNNS/PVA/WPU composite nanofiber membrane can reach 0.629 W (mK) −1 , with yield strength, ultimate tensile strength, and elastic modulus of ≈3.85, ≈5.87, and ≈35.22 MPa, respectively. The results indicate that the OH‐BNNS/WPU/PVA composite nanofiber membrane exhibits good thermal conductivity and outstanding hydrophilicity. When the content of OH‐BNNSs is appropriate, the composite membrane also demonstrates good mechanical properties, showing significant potential in the field of thermally conductive polymer materials.