Functionalized graphene-epoxy nanocomposites: experimental investigation of viscoelastic and viscoplastic behaviors

Basit Öğe Kaydı
dc.authorid0000-0003-1119-9273
dc.authorid0000-0003-2074-1300
dc.contributor.authorColak, Ozgen U.
dc.contributor.authorBirkan, Besim
dc.contributor.authorBakbak, Okan
dc.contributor.authorAcar, Alperen
dc.contributor.authorUzunsoy, Deniz
dc.date.accessioned2026-02-12T21:05:11Z
dc.date.available2026-02-12T21:05:11Z
dc.date.issued2023
dc.departmentBursa Teknik Üniversitesi
dc.description.abstractIn this work, graphene-epoxy nanocomposites are produced for two different graphene fractions (0.1 and 0.5 wt%). Three-roll milling is used as the main strategy to achieve a homogeneous dispersion and prevent agglomeration. To improve the interfacial bonding between graphene nanoflakes (GNF) and epoxy matrix, GNFs are functionalized using Triton X-100 as a surfactant. The effectiveness of this functionalization is investigated using Raman spectroscopy and Fourier transform infrared spectroscopy (FT-IR). These spectroscopy results show that the Triton X-100 molecules are successfully adsorbed on the surface of GNFs. To investigate the total viscoelastic-viscoplastic behavior of the nanocomposites, compression tests at three different quasistatic strain rates (1.E-1, 1.E-2, 1.E-3 /s), creep tests at two different stress levels and relaxation tests at two different strain levels are performed. The total time-dependent mechanical behavior of the produced nanocomposites is therefore characterized comprehensively. Elasticity-modulus values obtained from compression tests increased up to 29% and yield stress increased up to 18%. In creep tests, it is observed that the creep strain decreased 32% and 65% at 50 and 100 MPa stress levels, respectively, at 0.1 wt% functionalized graphene flakes (f-GNF)-epoxy nanocomposite. At the same time, with the addition of 0.1 wt% f-GNF to epoxy, during relaxation tests, the stress drop decreased up to 47% compared to pure epoxy at a 3.16% constant strain level. Both creep and relaxation resistance improved when compared to pure epoxy. This total improvement in the mechanical behaviors is explained with the effective dispersion of the GNFs and also a strong interface between the GNFs and the epoxy matrix.
dc.description.sponsorshipTUBTAK [119M088]
dc.description.sponsorshipWe thank Ozberk Ozturk for performing Raman spectra and FT-IR tests. Funding: This work is supported by TUBTAK. Project number: 119M088.
dc.identifier.doi10.1007/s11043-021-09530-z
dc.identifier.endpage205
dc.identifier.issn1385-2000
dc.identifier.issn1573-2738
dc.identifier.issue1
dc.identifier.scopus2-s2.0-85123294188
dc.identifier.scopusqualityQ2
dc.identifier.startpage185
dc.identifier.urihttps://doi.org/10.1007/s11043-021-09530-z
dc.identifier.urihttps://hdl.handle.net/20.500.12885/6839
dc.identifier.volume27
dc.identifier.wosWOS:000745375800001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherSpringer
dc.relation.ispartofMechanics of Time-Dependent Materials
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20260212
dc.subjectPolymer-matrix composites (PMCs)
dc.subjectCreep
dc.subjectStress relaxation
dc.subjectMechanical testing
dc.subjectGraphene-epoxy
dc.titleFunctionalized graphene-epoxy nanocomposites: experimental investigation of viscoelastic and viscoplastic behaviors
dc.typeArticle

Dosyalar

Koleksiyon

WoS İndeksli Yayınlar Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu