Simultaneously enhanced dielectric properties and through-plane thermal conductivity of epoxy composites with alumina and boron nitride nanosheets

• Published in: Scientific reports Vol. 11; no. 1; pp. 2495 - 11
• Main Authors: Wang, Zhengdong, Meng, Guodong, Wang, Liangliang, Tian, Liliang, Chen, Siyu, Wu, Guanglei, Kong, Bo, Cheng, Yonghong
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 28.01.2021; Nature Publishing Group; Nature Portfolio
• Subjects: 639/166/898; 639/166/987; Aluminum oxide; Boron; Dielectric properties; Electrical properties; Epoxy resins; Heat conductivity; Humanities and Social Sciences; multidisciplinary; Science; Science (multidisciplinary); Synergistic effect; Thermal conductivity
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-021-81925-x

Dielectric materials with good thermal transport performance and desirable dielectric properties have significant potential to address the critical challenges of heat dissipation for microelectronic devices and power equipment under high electric field. This work reported the role of synergistic effect and interface on through-plane thermal conductivity and dielectric properties by intercalating the hybrid fillers of the alumina and boron nitride nanosheets (BNNs) into epoxy resin. For instance, epoxy composite with hybrid fillers at a relatively low loading shows an increase of around 3 times in through-plane thermal conductivity and maintains a close dielectric breakdown strength compared to pure epoxy. Meanwhile, the epoxy composite shows extremely low dielectric loss of 0.0024 at room temperature and 0.022 at 100 ℃ and 10 −1  Hz. And covalent bonding and hydrogen-bond interaction models were presented for analyzing the thermal conductivity and dielectric properties.