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Deng, Libo
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Publications (4/4 displayed)
- 2013Supercapacitance from cellulose and carbon nanotube nanocomposite fiberscitations
- 2013Supercapacitance from cellulose and carbon nanotube nanocomposite fiberscitations
- 2011Toughening of epoxy matrices with reduced single-walled carbon nanotubescitations
- 2011The effect of nanotube content and orientation on the mechanical properties of polymer-nanotube composite fibers: Separating intrinsic reinforcement from orientational effectscitations
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article
Toughening of epoxy matrices with reduced single-walled carbon nanotubes
Abstract
Reduced single-walled carbon nanotubes (r-SWCNT) are shown to react readily at room temperature under inert atmosphere conditions with epoxide moieties, such as those in triglycidyl p-amino phenol (TGAP), to produce a soft covalently bonded interface around the SWCNT. The soft interface is compatible with the SWCNT-free cross-linked cured matrix and acts as a toughener for the composite. Incorporation of 0.2 wt % r-SWCNT enhances the ultimate tensile strength, toughness and fracture toughness by 32, 118, and 40%, respectively, without change in modulus. A toughening rate (dKIC/dwtf) of 200 MPa m0.5 is obtained. The toughening mechanism is elucidated through dynamic mechanical analyses, Raman spectroscopy and imaging, and stress-strain curve analyses. The method is scalable and applicable to epoxy resins and systems used commercially. © 2011 American Chemical Society.