Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 68, Issue 14, Pages 2965-2975Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2008.01.009
Keywords
Nanocomposites; Interface; Stress/strain curves; Fracture; Mechanisms
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There have been several reports of improved ductility and toughness in brittle thermoset polymers due to the addition of equiaxed nanoparticles [Ash BJ, Siegel RW, Schadler LS. Mechanical behavior of alumina/poly(methyl methacrylate) nanocomposites. Macromolecules 2004;37:1358-69; Kinloch AJ, Lee JH, Taylor AC, Sprenger S, Eger C, Egan D. Toughening structural adhesives via nano-and micro-phase inclusions. J Adhes 2003;79:867-73; Kinloch AJ, Mohammed RD, Taylor AC, Eger C, Sprenger S, Egan D. The effect of silica nanoparticles and rubber particles on the toughness of multiphase thermosetting epoxy polymers. J Mater Sci 2005;40:5083-6; Johnsen BB, Kinloch AJ, Mohammed RD, Taylor AC, Sprenger S. Toughening mechanisms of nanoparticle-modified epoxy polymers. Polymer 2007;48:530-41]. The mechanisms leading to this improvement, however, are incompletely understood. In this paper, a model system of nanoscale alumina filled bisphenol A based epoxy with two interface conditions was used to highlight the mechanisms leading to significant improvements in both ductility (max 39%) and modulus (max 18%). Tensile test showed that crack deflection, debonding and plastic deformation of the debonded matrix (plastic void growth) operated for the untreated particles with a relatively weak interface, but that a stronger interface led to enhanced crack deflection and microcracking, and, as a result, a further improvement in properties. (C) 2008 Elsevier Ltd. All rights reserved.
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