| Graphite nanoplatelets |
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Graphite Nanoplatelets particles consist of small stacks of graphene obtained by exfoliation of expanded graphite. The graphene sheet that forms the basal plane of these platelets is identical in composition to the graphene wall of a carbon nanotube, only in a flat sheet form. Edges of the platelets are the sites for functionalization, which helps facilitate hydrogen or covalent bonding within a polymer matrix. The size and morphology of nanoplatelets makes these particles especially effective at providing barrier properties, while their graphene structure makes them excellent thermal and electrical conductors. Unlike many other additives, graphite nanoplateletes improve mechanical properties like stiffness, strength, and surface hardness of the matrix material. Graphite nano-platelets are compatible with almost all polymers. Properties and Applications
Graphite nanoplatelets has a percolation threshold for conductivity of 1.9 wt% in thermoplastic matrix. At densities of 2–5 wt%, conductivity reaches sufficient levels to provide electromagnetic shielding. Graphite nanoplatelets can also be combined with glass fibers or other matrix materials to provide sufficient conductivity for electrostatic painting or other applications requiring electrical conductivity.
Graphite nanoplatelets significantly outperforms most other forms of carbon in terms of thermal conductivity when used at densities of 20 wt% in control resins. At these densities, Graphite nanoplatelets also confers significant electrical conductivity as well as improved mechanical properties to most thermoplastic, thermoset, or elastomeric systems. At lesser densities, adds thermal stability to a variety of matrix materials.
As opposed to materials like carbon black, Graphite nanoplatelets improves mechanical properties of most composites, particularly stiffness and tensile strength. Elastomeric compounds have been shown to experience increased life and reduced surface wear when reinforced with graphite nanoplatelets. Because of the platelet shape, Graphite nanoplatelets significantly improves the impermeability of composites when used at densities of ~3 wt% or greater. Particles can be aligned using electric field, although alignment is not necessary for use in most extrusion systems. Other applications are:
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