Sustainable Graphene Suspensions: A Reactive Diluent for Epoxy Composite Valorization

Abstract

Graphene, a novel nanofiller with excellent mechanical properties and high thermal and electrical conductivity, has the potential to enhance the value-added properties of polymer composites. In this study, we synthesized furan diepoxide (FdE) monomer and used it as a graphene dispersant. Graphene suspensions with concentrations of 0.5, 1.0, and 2.0 mg/mL were used as epoxy reactive diluents to improve the properties of graphene/epoxy nanocomposites. The UV and Raman spectra show that π−π interactions between the graphene nanosheets and FdE stabilized the graphene in the FdE suspension. Dispersion of 2.0 mg/mL of nanosheets into an epoxy resin enhanced the tensile strength by 26.8%, tensile modulus by 40.4%, flexural strength by 21.6%, flexural modulus by 16.8%, and glass transition temperature by 7.2%.

Variation of mechanical and thermal properties in sustainable graphene oxide/epoxy composites

“…It has been considered as useful nanofiller in polymer composites for the enhanced properties, and the small amount addition of G can improve the properties of the composites 4 . Generally, G is prone to irreversible aggregation and precipitation in water and organic media due to the insolubility of itself and the existence of Van der Waals forces and the π-π stacking between the lamellae, which greatly limits many practical applications of G 7 . Graphene oxide (GO) has a similar spatial two-dimensional structure, and different types of functional groups such as hydroxyl, epoxides, and carbonyl groups distributed on the surface of GO plane 8 .…”

Advanced Bio‐Based UV‐Curable Anticorrosive Coatings Reinforced by hBN

“…The signal at 5.15 ppm is assigned to the protons of the ‐CH 2 connecting the furan ring. Peaks locate at 2.01 and 6.40‐6.48 ppm, which are attributed to the protons in C=C in acrylate groups ,…”

“…We fitted the EIS results using ZSimpWin software via electrical equivalent circuits (Figure S5) to compare electrochemical behavior of various coatings. In the circuits, the R s , R p , R ct , Q c and Q dl represented the solution resistance, pore resistance, polarization resistance, coating capacitance, and double‐layer capacitance, respectively ,. According to the fitting models, R p , R ct , Q c and Q dl of different coatings at a function of immersion time was obtained by Zsimpwin 3.21.…”

Sequentially Bridged Graphene Sheets for High‐Performance Anticorrosion

“…As depicted in Figure 1F, the π–π stacking was formed at the RGO/WEP hetero interface via π–π transition (from 267 nm for the GO/WEP blue‐shifted to 300 nm for the RGO/WEP) of the aromatic rings in RGO sheets and WEP molecules. [ 28 ] Functional groups of hydrazoketone (1580 cm −1 ) and diazeketone (2085 cm −1 ) are formed in RGO/WEP hybrids (Figure 1G), and the peaks of epoxy groups at 570, 833, 1034, and 1501 cm −1 disappear. [ 29,30 ] This further demonstrated that the formation of covalent binding between RGO sheets and WEP molecules, and a polymer covered film was generated on the surface RGO sheets.…”