A study on graphene reinforced carbon fiber epoxy composites: Investigation of electrical, flexural, and dynamic mechanical properties

Hülya Kaftelen-Odabaşı*, Akın Odabaşı, Mustafa Özdemir, Murat Baydoğan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

In this study, graphene nanoplatelets (GNPs) added to epoxy matrix composite reinforced by aeronautical grade carbon fibers (CFs) were fabricated by the vacuum infusion method, and the effect of different GNPs contents (0.05, 0.25, and 1.25 wt%) on electrical conductivity, flexural properties, and dynamic mechanical properties were investigated. The results revealed an 8- and 73-times improvement in conductivity values across the thickness with the addition of 0.05 and 0.25 wt% GNPs, respectively, compared to the neat composite. Flexural test results showed that with the addition of 0.05 GNP, only 6% increase in flexural strength was obtained, while with the addition of 0.25 wt% GNP flexural strength remained almost the same as for the neat composite. On the contrary, the addition of GNPs (1.25% by weight) causes a reduction in the flexural strength with respect to the neat composite. This was confirmed by the fractured surfaces examined by scanning electron microscope which reveals that considerable amount of fiber-matrix debonding was observed with 1.25 GNPs loading. Dynamic mechanical analysis (DMA) revealed that the storage modulus of the neat composite increased by 12.6% with the addition of only a small amount of GNP (0.05% wt) compared to the neat composite. Composite with 1.25 GNP shows upward bending, affecting the shape of the cole–cole plot obtained from DMA results, indicating inappropriate interactions of GNPs in both the matrix and CF in the composite.

Original languageEnglish
Pages (from-to)121-135
Number of pages15
JournalPolymer Composites
Volume44
Issue number1
DOIs
Publication statusPublished - Jan 2023

Bibliographical note

Publisher Copyright:
© 2022 Society of Plastics Engineers.

Funding

Fırat University Scientific Research Project (FUBAP), Grant/Award Number: SHY 19.01 Funding information This work was supportedby The Scientific Research Project Council Unit (FUBAP) of Fırat University (grant number SHY 19.01). The authors would like to thank Dr. E. Kandare from RMIT University, Australia for his valuable discussions. This work was supported financially by The Scientific Research Project Council Unit (FUBAP) of Firat University (grant number SHY 19.01). This work was supportedby The Scientific Research Project Council Unit (FUBAP) of Fırat University (grant number SHY 19.01). The authors would like to thank Dr. E. Kandare from RMIT University, Australia for his valuable discussions.

FundersFunder number
FUBAP
Fırat University
Fırat University Scientific Research Project
Scientific Research Project Council Unit
Firat ÜniversitesiSHY 19.01
RMIT University

    Keywords

    • CFRP
    • dynamic mechanical analysis
    • electrical conductivity
    • flexural properties
    • GNPs

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