Facial fabrication of aramid composite insulating paper with high strength and good thermal conductivity

• DOI: 10.1016/j.coco.2020.100370
• Publication Date: 2020-06-05T11:37:42Z
• Authors: Mengjie Li; Yufan Zhu; Cuiqing Teng
• Keywords: Aramid; Electrical insulation paper

Abstract High strength and good thermal dissipation become the inevitable requirements for the next generation of insulation materials. Here, we report a facile method to prepare composite insulating papers by incorporating two-dimensional layered boron nitride nanosheets (BNNSs) into aramid nanofibers and aramid pulp. Their layer-by-layer structure fabricated by a vacuum-assisted filtration of their mixture suspension is similar to “brick – mortar” arrangement, contributing to the enhanced mechanical properties due to their strong interaction. Meanwhile, BNNSs act as heat-conducting “bridges”, which provide the phonon conduction channels and reduce the interface thermal contact resistance. The thermal conductivity of the composite paper with 20% loading of BNNS reaches 4.34 W m-1 K-1 and the dielectric strength is up to 59.6 kV mm-1; whereas, the values of the parallel sample without BNNS are only 0.98 W m-1 K-1 and 25.1 kV mm-1, respectively. The composite papers possess highly thermal conductivities, outstanding electrical insulation and thermal stabilities, and excellent mechanical strength and flexibility, showing great potential applications in the field of flexible electronics.