Abstract The electrospun polyvinylidene fluoride (PVDF) based modified boron nitride (m-BN) composite with high thermal conductivity and flexible mechanical property was successfully fabricated by electrospinning method. The uniform dispersion and ordered orientation of m-BN in the m-BN/PVDF composites form a hot string, denoted as a series of thermal conduction fillers, in the direction of the fiber. Hence, the thermal conductivity of the m-BN/PVDF film could reach to 7.29 W m−1K−1 with the addition of 30 wt% m-BN. Besides, the obtained composites also show improved mechanical properties with the tensile strength of 24.06 MPa, low dielectric permittivity of 2.45 and dielectric loss of 0.0242 @ 103 Hz. Therefore, this work provides a new route to prepare the high thermal conductivity films with potential application as flexible power devices.

中文翻译：

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通过静电纺丝在聚偏二氟乙烯纤维中通过氮化硼热线增强热导率和机械性能

摘要 采用静电纺丝法成功制备了具有高导热性和柔性机械性能的电纺聚偏氟乙烯（PVDF）基改性氮化硼（m-BN）复合材料。m-BN/PVDF 复合材料中 m-BN 的均匀分散和有序取向在纤维方向形成了热线，表示为一系列导热填料。因此，添加 30 wt% m-BN 后，m-BN/PVDF 薄膜的热导率可以达到 7.29 W m-1K-1。此外，所获得的复合材料还表现出改善的机械性能，拉伸强度为 24.06 MPa，低介电常数为 2.45，介电损耗为 0.0242 @ 103 Hz。因此，这项工作为制备具有作为柔性功率器件潜在应用的高导热薄膜提供了一条新途径。