In the present study, magnetite nanoparticles were added to an electrospinning solution of polyvinylidene fluoride (PVDF)/polybenzimidazole (PBI) polymers to prepare PBI/Fe3O4 nanofibers (NFs). The operating voltage of the electrospinning device was set to 15 kV, the distance between the needle and the plate was 10 cm, and the feed rate was set to 0.3 mL h−1. The microstructures of the as-prepared NFs were investigated by Fourier transform infrared spectrophotometry, atomic force microscopy, thermogravimetric analysis, and vibration sample magnetometry. Magnetite-doped PVDF/PBI NFs exhibited superior magnetism and saturation magnetization in the range of 1.5–5 emu g−1. It was observed that the thermal resistance of the fibers increased with the increasing amount of magnetic particles and nanocomposite fiber (NCF) 1 and NCF2 exhibited excellent thermal resistance up to 415°C and 450°C, respectively. The heat conduction coefficient of the fibers was measured at 4, 6, and 8 W. The thermal conductivity of the NFs increased with the increasing amount of magnetite nanoparticles, and the highest thermal conductivity coefficient for NCF2 (1.83 W mK−1) was measured at 4 W.

中文翻译：

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耐高温导热磁性PBI/Fe3O4纳米纤维的合成与表征

在本研究中，将磁铁矿纳米颗粒添加到聚偏二氟乙烯 (PVDF)/聚苯并咪唑 (PBI) 聚合物的静电纺丝溶液中，以制备 PBI/Fe3O4 纳米纤维 (NFs)。静电纺丝装置的工作电压设置为15 kV，针与板之间的距离为10 cm，进料速率设置为0.3 mL h-1。通过傅里叶变换红外分光光度法、原子力显微镜、热重分析和振动样品磁强法研究了所制备的纳米纤维的微观结构。掺杂磁铁矿的 PVDF/PBI NF 在 1.5-5 emu g-1 范围内表现出优异的磁性和饱和磁化强度。据观察，纤维的耐热性随着磁性颗粒数量的增加而增加，纳米复合纤维 (NCF) 1 和 NCF2 分别在高达 415°C 和 450°C 时表现出优异的耐热性。在 4、6 和 8 W 下测量了纤维的导热系数。 NFs 的导热系数随着磁铁矿纳米粒子数量的增加而增加，并且测量到 NCF2 的最高导热系数（1.83 W mK-1）在 4 W。