期刊
MACROMOLECULAR MATERIALS AND ENGINEERING
卷 307, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.202100734
关键词
3D interlocking skeletons; electrical insulating properties; epoxy composites; low h-BN loading; thermal conductivity
资金
- National Natural Science Foundation of China [U20A20308]
- Natural Science Foundation of Heilongjiang Province [TD2019E002]
- China Postdoctoral Science Foundation [2021T140166]
- Youth Innovative Talents Training Plan of Ordinary Undergraduate Colleges in Heilongjiang [UNPYSCT-2020178]
This study successfully synthesized 3D hexagonal boron nitride and applied it as a filler in epoxy resin, improving its thermal conductivity and insulating properties. With a filling content of 9 wt.%/21wt.%, the thermal conductivity reached 0.86 W (m K)(-1), while maintaining good insulating properties.
Epoxy resin (EP) has been widely used in electronic packaging and electrical equipment due to its excellent electrical insulating properties. However, the low thermal conductivity (TC) of EP limits its wider application and needs to be further improved. In this study, 3D hexagonal boron nitride (3D h-BN) is successfully synthesized by utilizing TEMPO oxidated cellulose nanofiber hydrogels (TOCNF) as an interlocking skeleton, and then 3D h-BN/TOCNF are chosen as the functional fillers to improve the TC of EP. The microstructure, TC, and electrical insulating properties of epoxy composites are systematically characterized and analyzed. The results show that epoxy composites filled with 3D h-BN/TOCNF deliver a significantly improved TC and maintain excellent insulating properties. When the filled content of 3D h-BN/TOCNF is 9 wt.%/21wt.%, a TC of 0.86 W (m K)(-1) is obtained at 25 degrees C, which also demonstrates favorable electrical insulating properties with a volume resistivity of more than 10(15) Omega m and breakdown strength of 186.1 kV mm . This work offers an efficient method to improve the thermal and electrical performances of EP for electronics and electrical engineering applications.
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