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An investigation of the mechanism of graphene toughening epoxy

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journal contribution
posted on 17.06.2015, 12:44 by Xiao Wang, Jie Jin, Mo Song
The three different sized chemical functionalized graphene (GO) sheets, namely GO-1 (D50 = 10.79 μm), GO-2 (D50 = 1.72 μm) and GO-3 (D50 = 0.70 μm), were used to fabricate a series of epoxy/GO nanocomposites. Fracture toughness of these materials was assessed. The results indicate that GO sheets were dramatically effective for improving the fracture toughness of the epoxy at a very significant low loading. The enhancement of the epoxy toughness was strongly dependent on the size of GO sheets incorporated. GO-3 with smaller sheet size gave the maximum reinforcement effect compared with GO-1 and GO-2. The incorporation of only 0.1 wt% GO-3 was observed to increase the fracture toughness of pristine epoxy by ∼75%. The toughening mechanism was well understood by fractography analysis of the tested samples. Massive cracks in the fracture surfaces of the epoxy/GO nanocomposites were observed. The GO sheets effectively disturbed and deflected the crack propagation due to its two dimensional structure. GO-3 sheets with smaller size were highly effective in resisting crack propagation, and a large area of whitening zone was observed. The incorporation of GO also enhanced the stiffness and thermal stability of the epoxy.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Carbon

Volume

65

Pages

324 - 333

Citation

WANG, X., JIN, J. and SONG, M., 2013. An investigation of the mechanism of graphene toughening epoxy. Carbon, 65, pp. 324 - 333.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2013

Notes

This article was accepted for publication in the journal Carbon [© Elsevier]. The definitive version is available at: http://dx.doi.org/10.1016/j.carbon.2013.08.032.

ISSN

0008-6223

Language

en

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