Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 3, Issue 2, Pages 129-134Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am1011047
Keywords
multiwall carbon nanotubes; epoxy composite; single-fiber pull-out; interfacial strength
Funding
- National Science Foundation [NSF CMMI 0800896, 0928297, DMR-0819885]
- Welch Foundation [C-1716]
- Air Force Research Laboratory [AFRL FA8650-07-2-5061]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0928297] Funding Source: National Science Foundation
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Traditional single-fiber pull-out type experiments were conducted on individual multiwalled carbon nanotubes (MWNT) embedded in an epoxy matrix using a novel technique. Remarkably, the results are qualitatively consistent with the predictions of continuum fracture mechanics models. Unstable interface crack propagation occurred at short MWNT embedments, which essentially exhibited a linear load-displacement response prior to peak load. Deep embedments, however, enabled stable crack extension and produced a nonlinear load-displacement response prior to peak load., The maximum pull-out forces corresponding to a wide range of embedments were used to compute the nominal interfacial shear strength and the interfacial fracture energy of the pristine MWNT-epoxy interface.
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