Graphene foam with high thermal conductivity is embedded in epoxy composites

High thermally conductive polymer composites with low fill have attracted much attention because of their wide application prospects. The structure of the three-dimensional (3D) interconnect network can effectively improve the thermal conductivity of polymer composites. In this paper, an easy and scalable method is proposed, i.e., the use of low-cost commercial polyurethane sea foam (PU) to prepare graphene foam (GF)

. The high thermal composite material is then prepared by impregnated with epoxy resin into the GF structure. At a low graphene load of 6.8 wt%, an ultra-high thermal conductivity of 8.04 W m-1 K-1 is obtained, which is approximately 4473% higher than that of pure epoxy resins. This strategy provides a simple, low-cost and scalable method for building a 3D-filled network structure of high-performance composite materials, and has broad application prospects in advanced electronic packages.
preparation process for Fig. 1 GF/epoxy composites.
fig. 2 (a) PVP features the chemical structure of the fossil ink powder and PVP. (b) SEM diagram of GNPs. (c) PHOTOS of PU foam, GNP coated foam and graphene foam heating HF in air (above and (d)) and slow heating in Ar (below). The (e) Raman spectra and (f) FTIR spectra of GNP before and after HF heating treatment.
Fig. 3 (a) PU foam, (b) GNP coated foam, (c) GF, (d) low-fold SEM diagram of GF/epoxy composites;
Fig. 4 (a) thermal conductivity (TC) and thermal diffusion coefficient (TD) of GF/epoxy composites. (b) The coefficient of thermal diffusion of GF/epoxy composites with different loads varies with temperature. (c) The thermal conductivity of GF/epoxy composites and pure epoxy materials after multiple heating and cooling cycles. (d) Thermal conductivity and TCE of pure epoxy, GNP/epoxy composites, GF/epoxy composites. (e) Thermal conduction models of GNP/epoxy resins and GF/epoxy composites. (f) Comparison of GF/epoxy composites with the thermal conductivity of other graphene-epoxy composites.
Fig. 5 Temperature-time curves measured at the surface center of pure epoxy, GNP/epoxy composites and GF/epoxy composites and (b) experimentally determined. (c) Comparison of the temperature-time curve of the GF/epoxy composite material with the calculation simulation curve.
results were published in 2019 by Jinhong Yu of the Ningbo Institute of Materials Technology and Engineering of the Chinese Academy of Sciences on Nanoscale (DOI: 10.1039/c9nr03968f). Original: Graphene foam-embedded epoxy composites with greater thermal conduct enhancement.