Journal
MATERIALS & DESIGN
Volume 59, Issue -, Pages 19-32Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2014.02.034
Keywords
Carbon nanotube reinforced epoxy adhesive; Nanocomposite; Constitutive response; Fracture toughness
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Qatar National Research Fund
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In this work, the mechanical properties of carbon nanotube reinforced epoxy adhesives are investigated experimentally. The investigations are intended to characterize the physical and mechanical properties of nano-reinforced structural epoxy adhesives and to further highlight some of the complex phenomena associated with these materials. We describe the dispersion methodology used to disperse the carbon nanotubes into the considered adhesive and provide details pertaining to adherent surface preparation, bondline thickness control and adhesive curing conditions. Furthermore, the following tests are described: (i) dogbone tensile testing, (ii) tensile bond testing, (iii) double lap shear and (iv) double cantilever beam fracture toughness testing. The experimental observations indicate a critical carbon nanotube concentration in the vicinity of 1.5 wt% that results in the largest improvements in the measured properties. At concentrations exceeding this critical value, the properties begin to degrade, in some cases, to levels below that of the pure epoxy. Advanced electron microscopy techniques and rheological assessments indicate that this is mainly due to the agglomeration of the carbon nanotubes at higher concentrations as a result of increased resin viscosity and the consequent resistance to dispersion. (C) 2014 Elsevier Ltd. All rights reserved.
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