The correlated effects of filler loading on the curing reaction and mechanical properties of graphene oxide reinforced e
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The correlated effects of filler loading on the curing reaction and mechanical properties of graphene oxide reinforced epoxy nanocomposites Junpeng Tian1,2
, Cheng Yang2,*
, Jiping Yang1,*
, and Sijia Hao2
1
Key Laboratory of Aerospace Advanced Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, People’s Republic of China 2 Research Center of Graphene and Applications, Beijing Institute of Aeronautical Materials, Aero Engine Corporation of China, Beijing 100095, People’s Republic of China
Received: 22 May 2020
ABSTRACT
Accepted: 4 September 2020
Graphene oxide (GO)/epoxy nanocomposites are prepared by means of the phase extraction method. FTIR and XPS characterizations have confirmed the charge transfer between GO and epoxy that promotes the uniform dispersion and exfoliation of GO. The effects of GO sheets on the curing reaction and interfacial bonding are investigated and correlated with mechanical properties of epoxy nanocomposites. The results show that the GO sheets have a facilitation effect on the curing reaction of epoxy resin, in which the oxygen groups of GO covalently react with epoxy matrix and establish chemical interfacial bonding in epoxy nanocomposites. Therefore, the mechanical properties of nanocomposites are enhanced, showing the highest tensile strength of 88.1 ± 2.5 MPa, flexural strength of 134.2 ± 6.1 MPa and flexural modulus of 3.15 ± 0.11 GPa, respectively. However, GO sheets could simultaneously physically restrict the curing reactivity and reduce the cross-link density in the interface, which results in weakened interfacial property of nanocomposites, especially at high loading. Thus, the reinforcing effect of GO sheets is reduced and the mechanical properties of GO/epoxy nanocomposites decline at relatively higher loading.
Published online: 5 November 2020
Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Gregory Rutledge.
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05336-5
3724
J Mater Sci (2021) 56:3723–3737
GRAPHICAL ABSTRACT
Introduction Epoxy is one of the most versatile thermosetting resins and has been widely used due to the excellent adhesion, mechanical properties and chemical resistance. In recent years, many types of carbon nanomaterials, in particular, graphene-based 2D materials with superior stiffness, strength, thermal and electrical conductivity have been intensively investigated as ideal nano-fillers for epoxy to enhance the mechanical, thermal and electrical properties of the resulted nanocomposites to meet the increasing requirements of high-tech fields [1–10]. Compared with graphene that has high cost, chemical inertness and easy formation of aggregation, graphene oxide (GO) with relative ease of fabrication in bulk quantities and the presence of active oxygen-containing groups for surface modification is believed to be a suitable nano-filler for enhancing the performance
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