Fabrication of Boron Nitride@Polydopamine/Polyvinyl Alcohol/Polyvinylidene Fluoride Composite Film With Good Thermal Stability and Thermal Conductivity via Electrospinning and Hot Pressing Treatment

Vollständiger Abstract

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The field of thermal conductivity is one of the important applications of polymers. However, polymer material generally possesses low thermal conductivity due to its internal characteristic, which cannot meet the heat dissipation requirement of device. Therefore, the preparation of polymer material with high thermal conductivity has broad application prospect and important significance. To achieve this goal, a new‐type composite film was fabricated via electrospinning and hot pressing treatment. Utilizing the self‐polymerization of dopamine under alkaline condition, polydopamine (PDA) was deposited on the surface of boron nitride (BN). The obtained BN@PDA acted as filler for polyvinyl alcohol (PVA). In addition, polyvinylidene fluoride (PVDF) was introduced into PVA through coaxial spinning. The results indicated that the thermal conductive filler was uniformly distributed and well adhered on the fiber. Moreover, thanks to the intermolecular force between PVA and PVDF, the acquired composite film had good thermal stability with the decomposition temperature over 300 °C. On the other hand, the got composite film exhibited good thermal conductivity at low filling ratio. It could quickly transfer the heat generated during the operation of the LED light, which could reduce the operating temperature of the equipment in actual use, demonstrating its good heat dissipation capability.