Control of the functionality of graphene oxide for its application in epoxy nanocomposites |
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| Authors: | Zheng Li Rongguo Wang Robert J. Young Libo Deng Fan Yang Lifeng Hao Weicheng Jiao Wenbo Liu |
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| Affiliation: | 1. Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China;2. Materials Science Centre, School of Materials, The University of Manchester, Manchester M13 9PL, UK;3. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | Amino- and epoxy-functionalized graphene oxide (GO) were synthesized separately through a wash-and-rebuild process utilizing two differently terminated silane coupling agents. The modified GO sheets were then incorporated into an epoxy resin to prepare nanocomposites. The addition of 0.2 wt% amino-functionalized GO (APTS-GO) yielded a 32% increase in Young's modulus (3.3 GPa) and 16% increase in tensile strength (81.2 MPa). Less reinforcement was observed with the epoxy-functionalized GO (GPTS-GO) but there was a more significant increase in ductility for GPTS-GO/epoxy, with the fracture toughness (critical intensity factor, KIC) and fracture energy (critical strain energy release rate, GIC) nearly doubling at 0.2 wt% loading (1.46 MPam1/2 and 0.62 kJ/m2 for KIC and GIC, respectively). Raman spectroscopy measurements revealed that the GPTS-GO was dispersed more uniformly than the APTS-GO in the epoxy matrix, and better interfacial stress transfer was found for the APTS-GO. Thus the wash-and-rebuild process affords a novel strategy for controlling the functionality of graphene in the quest to develop high-performance graphene-based nanocomposites. |
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| Keywords: | Graphene oxide Polymer nanocomposites Interfaces |
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