期刊
CHEMICAL ENGINEERING JOURNAL
卷 348, 期 -, 页码 723-731出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.04.196
关键词
Thermal conductivity; Layer-by-layer assembly; Boron nitride; Melamine foam; Epoxy composite
资金
- National Science Foundation of China [51733003, 21674025, 51473038]
Realizing high-efficiency thermal conductivity enhancement at low filler loading has a great significance for thermally conductive composite. Herein, three-dimensional (3D) boron nitride nanosheets (BNNSs) wrapped melamine foams (MF@BNNS) were first fabricated by repeated layer-by-layer (L-B-L) assembly using melamine skeleton as substrate and BNNSs as building blocks. The resultant MF@BNNS scaffold with order and interconnected BNNS layer, as a thermally conductive network, was further infiltrated with epoxy resin. As a consequence, a relatively high thermal conductivity of 0.6 W m(-1) K-1 was achieved at an ultralow BNNS loading of similar to 1.1 vol%, which is equivalent to a thermal conductivity enhancement of 233% compared to epoxy resin. Besides, the obtained epoxy composite also possesses a good mechanical property and excellent electrical insulativity. This method can be further extended to construct 3D filler network of other 2D layered materials on the melamine foam for high-performance composite.
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