Abstract The effect of the electrical field treatment using the direct current (DC) during preparation of the composite sheets on their effective thermal conductivity (TC) and electrical insulation property for the hexagonal boron nitride (hBN)/fluorinated polyimide was studied. By the electrical field treatment, the aggregation of hBNs was obviously observed in the cross-sections of the composite sheets, and the number of hBNs lying parallel to the in-plane direction of the sheets was decreased based on XRD study. Moreover, the effective TC in the out-of-plain direction of the composite sheets treated with a one-way electrical field was increased approximately 1.5-fold that of the corresponding sheets prepared without electrical field treatment at 14.2 vol%. On the other hand, electrical insulation properties were deteriorated by the electrical field treatment, and the values for breakdown voltage against DC roughly approximated that following electrical field treatments to high content of hBNs regardless of their size.

中文翻译：

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使用直流电场提高六方氮化硼/氟化聚酰亚胺复合材料的热导率

摘要 研究了在复合片材制备过程中使用直流电（DC）进行电场处理对六方氮化硼（hBN）/氟化聚酰亚胺的有效热导率（TC）和电绝缘性能的影响。通过电场处理，在复合片材的横截面中明显观察到 hBNs 的聚集，并且基于 XRD 研究，平行于片材面内方向的 hBNs 的数量减少。此外，经单向电场处理的复合片材在非平面方向上的有效 TC 比未经电场处理的相应片材增加了约 1.5 倍，为 14.2 vol%。另一方面，