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

Ali Tarhini, Ali Tehrani-Bagha*, Michel Kazan, Brian Grady

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

29 Citations (Scopus)
108 Downloads (Pure)


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.

Original languageEnglish
Article number49821
Number of pages10
JournalJournal of Applied Polymer Science
Issue number6
Early online date6 Sept 2020
Publication statusPublished - 10 Feb 2021
MoE publication typeA1 Journal article-refereed


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


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