The Effect of Graphene Dispersion on the Electrical Properties of Polyimide Nanocomposites

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2021-12-12 DOI:10.1109/CEIDP50766.2021.9705447

Imadeddine Benfridja, S. Diaham, B. Stenson, Baoxing Chen, T. Kennedy

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引用次数: 2

Abstract

Graphene-based polymer nanocomposites have attracted widespread industrial interest as the electrical conductivity of the material can be precisely controlled due to the unique conduction properties of graphene. In this paper, we show the effect of exfoliation methods and dispersion time on the particle dispersion, aggregate size and the overall electrical conduction of polyimide/graphene nanocomposites. A set of polyimide films with a varying graphene nanoflake content were prepared by thermal imidization and electrically characterised to assess the impact of the composition of the nanocomposite on the electrical percolation threshold. Three dispersion techniques were investigated (i.e. high shear mixing, ultrasonication probe and planetary mixing) and it was found that the size of the graphene nanoflakes was reduced by increasing the dispersion time in each case. The highest dispersion quality was obtained using the high shear mixing technique which yielded an electrical percolation threshold of 0.03 wt%.

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石墨烯分散对聚酰亚胺纳米复合材料电性能的影响

石墨烯基聚合物纳米复合材料由于其独特的导电性可以精确控制材料的导电性，因此引起了广泛的工业兴趣。在本文中，我们展示了剥离方法和分散时间对聚酰亚胺/石墨烯纳米复合材料的颗粒分散、聚集体尺寸和整体导电性的影响。通过热亚酰化制备了一组不同石墨烯纳米片含量的聚酰亚胺薄膜，并对其进行了电表征，以评估纳米复合材料的组成对电渗透阈值的影响。研究了三种分散技术(高剪切混合、超声探针和行星混合)，发现在每种情况下，随着分散时间的增加，石墨烯纳米片的尺寸减小。采用高剪切混合技术获得了最高的分散质量，其电渗透阈值为0.03 wt%。

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2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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