期刊
COMPOSITES PART B-ENGINEERING
卷 210, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.108666
关键词
Epoxy resins; Thermally conductive composites; Silicon carbide nanowires; Boron nitride nanosheets; Nest-like hetero-structure
资金
- Guangdong Basic and Applied Basic Research Foundation [2019B1515120093]
- National Natural Science Foundation of China [51773169, 51973173]
- Natural Science Basic Research Plan for Distinguished Young Scholars in Shaanxi Province [2019JC-11]
- Open Fund from Henan University of Science and Technology [2020-RSC02]
- Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University [CX202055]
- Undergraduate Innovation AMP
- Business Program in Northwestern Polytechnical University [S202010699141]
- Polymer Electromagnetic Functional Materials Innovation Team of Shaanxi Sanqin Scholars
The novel nest-like hetero-structured BNNS@SiCnws thermally conductive fillers showed enhanced thermal conductivity and excellent heat transfer/dissipation efficiency, contributing to the formation probability of thermally conductive paths.
Silicon carbide nanowires (SiCnws) were in-situ grown on boron nitride nanosheets (BNNS) to construct a novel kind of nest-like hetero-structured BNNS@SiCnws thermally conductive fillers from natural bamboo leaves and tetraethyl orthosilicate (TEOS) by means of ultrasonic impregnation, sol-gel followed by carbothermic reduction. Then, the thermally conductive & electrically insulating BNNS@SiCnws/epoxy composites were prepared via blending-casting method. When the amount of BNNS@SiCnws-II (65/35, wt/wt) was 20 wt%, BNNS@SiCnws/epoxy composites presented the optimal overall performances. Thermal conductivity coefficient (lambda) of BNNS@SiCnws-II (20 wt%)/epoxy composites increased from 0.22 W/mK of pure epoxy matrix to 1.17 W/mK, higher than that of SiCnws/epoxy (0.72 W/mK), BNNS/epoxy (0.82 W/mK) and (BNNS/SiCnws)/epoxy composites (direct mixing BNNS/SiCnws, 65/35, wt/wt, 0.76 W/mK) with the same filler concentration of 20 wt%. Meanwhile, BNNS@SiCnws/epoxy composites presented excellent heat transfer/heat dissipation efficiency, due to synergistic effect of the line-to-surface hetero-structure of SiCnws and BNNS, which could significantly improve the formation probability of the thermally conductive paths. Furthermore, the BNNS@SiCnws/epoxy composites possessed favorable electrical insulation, thermostability and ideal mechanical properties. Furthermore, the related surface & volume resistivities, the electric breakdown strength, the glass-transition temperature, the heat resistant index, the flexural strength as well as the impact strength of BNNS@SiCnws-II (20 wt %)/epoxy composites reached to be 3.7 x 10(15) Omega, 5.17 x 10(15) Omega.cm, 22.1 kV/mm, 126.7 degrees C, 185.5 degrees C, 75.7 MPa and 8.2 kJ/m(2), respectively.
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