The effect of graphene flake size on the properties of graphene-based polymer composite films

In this work, the role of graphene flake size on the properties of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) composites was studied. Graphene flakes were added to PVDF-HFP using a solution mixing and molding process. By increasing graphene particle size and its concentration in the composites, higher electrical conductivity, in-plane thermal conductivity, and elastic modulus were achieved. Maximum tensile strength was obtained for the composites with average graphene flake size of 2, 5, and 7 μm at graphene concentrations of 10 wt%, 5 wt%, and 20 wt%, respectively. Thick flexible composite films (0.2–0.4 mm) with ultra-high in-plane electrical conductivity (~4500 S/m), in-plane thermal conductivity (~26 W/m/K), and tensile strength (~50 MPa) were obtained for the samples containing the graphene flakes with a larger average particle size of 7 μm. To our knowledge, the first two values are larger than any other values reported in the literature for PVDF-based composites.

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electrical conductivity, graphene, mechanical properties, polymer composite film, thermal conductivity

DOI

10.1002/app.49821

Citation

Tarhini, A, Tehrani-Bagha, A, Kazan, M & Grady, B 2021, ' The effect of graphene flake size on the properties of graphene-based polymer composite films ', Journal of Applied Polymer Science, vol. 138, no. 6, 49821 . https://doi.org/10.1002/app.49821

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https://urn.fi/URN:NBN:fi:aalto-2021121510766

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[article-cris] Kemian tekniikan korkeakoulu / CHEM

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The effect of graphene flake size on the properties of graphene-based polymer composite films

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