Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 161, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2022.107081
Keywords
Multifunctional composites; Electrical properties; Thermal properties; Microstructural analysis
Funding
- National Natural Science Foundation of China [51721091]
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By exfoliating boron nitride in liquid metal and using it as hybrid fillers without separation, polypropylene composites with enhanced dielectric constant and thermal conductivity were successfully fabricated. The composites exhibit excellent performance while maintaining low dielectric loss and low conductivity of the polypropylene.
For microelectronic fields, high dielectric, high insulating and high thermal conductive performances need to be simultaneously integrated in materials to improve devices' performance, safety, and thermal management ability. Despite the huge potential of exfoliated boron nitride (BN)/polymer composites in them, the exfoliation of BN is difficult, leading to limited increases of dielectric and thermal conductive performance. Herein, BN is first exfoliated in liquid metal (LM) matrix by mechanical grinding, which activates the interaction between LM and BN to promote exfoliation. Then the one-pot mixture containing exfoliated BN and LM, is used as hybrid fillers (LM@BN) without separation for preparing polypropylene (PP)/LM@BN composites. The composites behave a remarked dielectric constant of 3.5 and thermal conductivity of 1.9 W/m.K at LM@BN content of only 5.5 vol%. Extra low dielectric loss (0.005) and low conductivity (10(11) S/cm(3)) of PP could be also maintained, due to suppressed space charges by the uniformly-dispersed exfoliated BN.
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