Abstract
Supercritical carbon dioxide (scCO2) has been employed in conjunction with vapor growth carbon fibers (VGCFs) and graphene nanoplatelets (GNPs) to enhance the properties (electrical, thermal, physical) of a poly(methyl methacrylate) (PMMA) matrix. When the VGCF loading was 10wt.%, the electrical conductivity (9.33S/m) of the PMMA-VGCF nanocomposite prepared through scCO2 mixing at 103.4bar and 40°C was 15.6% greater than that obtained when using traditional mixing in N-methyl-2-pyrollidone (NMP). A synergetic effect existed for the VGCFs and GNPs, with the thermal conductivity of the PMMA-VGCF-GNP nanocomposite [0.492W/(mK)] being 20.2% greater than that of the individual PMMA-VGCF nanocomposite [0.409W/(mK)], after applying scCO2 mixing. The advantages of the proposed scCO2 technology are twofold: it enhances the dispersion of VGCFs and GNPs in the PMMA matrix and eliminates residual NMP after scCO2 drying.
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