Thermally Conductive, Superhydrophobic, and Flexible Composite Membrane of Polyurethane and Boron Nitride Nanosheets by Ultrasonic Assembly for Thermal Management AITranslate

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DOI：https://doi.org/10.1021/acsapm.2c01798

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Thermal management is of significance for modern electronic products, and it remains challenging to keep the cooling performance of thermal management materials in multi-environment applications from being unaffected by external contamination. Herein, we constructed thermally conductive, superhydrophobic, and flexible composites using thermoplastic polyurethane electrospun membrane as a nano-fibrous substrate, hexagonal boron nitride nanosheets as a conducting filler, and polydimethylsiloxane/SiO2 nanoparticles for hydrophobization. The composite membrane demonstrated outstanding thermal management performance with an ultrahigh thermal conductivity (TC) of 7.193 W/m K. The membrane is flexible with durable TC even after 500 bending and stretching cycles and possesses superhydrophobicity with a water contact angle greater than 165° and a slide angle lower than 2.7°, which prevents the surface from being stained and protects its excellent TC for long-term applications, favoring thermal management of modern electronic products.