Influence of the reaction stoichiometry on the mechanical and thermal properties of SWCNT-modified epoxy composites

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DOIResolve DOI: http://doi.org/10.1088/0957-4484/24/26/265701
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TypeArticle
Journal titleNanotechnology
ISSN0957-4484
Volume24
Issue26
Article number265701
SubjectCross-link densities; Diaminodiphenylsulfone; Mechanical and thermal properties; Overall properties; Reaction stoichiometry; Single-walled carbon nanotube (SWCNTs); Thermal and mechanical properties; Ultimate tensile strength; Curing; Epoxy resins; Fracture toughness; Mechanical properties; Raman spectroscopy; Resins; Scanning electron microscopy; Single-walled carbon nanotubes (SWCN); Tensile strength; Thermodynamic properties; Stoichiometry
AbstractPrevious studies suggest that carbon nanotubes (CNTs) have a considerable influence on the curing behavior and crosslink density of epoxy resins. This invariably has an important effect on different thermal and mechanical properties of the epoxy network. This work focuses on the important role of the epoxy/hardener mixing ratio on the mechanical and thermal properties of a high temperature aerospace-grade epoxy (MY0510 Araldite as an epoxy and 4,4′-diaminodiphenylsulfone as an aromatic hardener) modified with single-walled carbon nanotubes (SWCNTs). The effects of three different stoichiometries (stoichiometric and off-stoichiometric) on various mechanical and thermal properties (fracture toughness, tensile properties, glass transition temperature) of the epoxy resin and its SWCNT-modified composites were obtained. The results were also supported by Raman spectroscopy and scanning electron microscopy (SEM). For the neat resin, it was found that an epoxy/hardener molar ratio of 1:0.8 provides the best overall properties. In contrast, the pattern in property changes with the reaction stoichiometry was considerably different for composites reinforced with unfunctionalized SWCNTs and reduced SWCNTs. A comparison among composites suggests that a 1:1 molar ratio considerably outperforms the other two ratios examined in this work (1:0.8 and 1:1.1). This composition at 0.2 wt% SWCNT loading provides the highest overall mechanical properties by improving fracture toughness, ultimate tensile strength and ultimate tensile strain of the epoxy resin by 40%, 34%, 54%, respectively. © 2013 IOP Publishing Ltd.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO); Security and Disruptive Technologies (SDT-TSR)
Peer reviewedYes
NPARC number21269800
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Record identifiera2ac634e-58e2-48dc-82b8-9eae3f81149a
Record created2013-12-13
Record modified2016-05-09
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