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Recently, copper matrix composites reinforced with graphene or graphene-like carbon nanosheets (GNS) have attracted great attention due to their excellent properties. However, the fabrication technologies of the composites are generally complex and expensive; it is necessary to develop facile and cheap synthesis methods for industrial applications of the composites with high performance. Here, we present a very simple method to fabricate GNS reinforced copper composites: commercial Cu powders with oleic acid coating are directly fabricated into GNS/Cu composites by spark plasma sintering. This work provides a facile method with low cost and high efficiency for the preparation of GNS reinforced metal matrix composites with high performance, which opens a new window for the large-scale production of graphene based composites.

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A series of poly(vinylidene fluoride)s (PVDFs) is synthesized in supercritical carbon dioxide (sc-CO 2 ). The influences of polymerization pressure, molecular weight distribution and H-H defect concentration on the crystallization of PVDF have been studied in combination with differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXRD) and Fourier transform infrared spectroscopy (FT-IR) measurements. The result shows that the morphology, molecular weights, polydispersity and head-to-head (H-H) defect concentrations of the PVDFs are affected by the reaction pressure and good solubility generated from sc-CO 2. Especially, the sc-CO 2 polymerization has greatly improved the crystallization mode of the obtained PVDFs such as the complete degree of crystallinity, crystallinity and the crystal phase. This will create more comprehensive application fields for PVDF.