Mechanical and interfacial properties of individual vapor grown carbon nanofibers in epoxy matrices

T. Ozkan, Q. Chen, Ioannis Chasiotis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Three grades of vapor grown carbon nanofibers (pyrolytically stripped, heat-treated, heat-treated and oxidatively treated) with diameters 100-350 nm were tested for their tensile strength and interface adhesion properties by a novel MEMS-based mechanical testing platform. The nominal tensile strengths of the pyrolytically stripped and the heat-treated nanofibers followed Weibull distributions with characteristic strengths between 2.8-3.4 GPa. The true material strengths, excluding the hollow fiber cores, were ∼33% higher than the nominal strengths. The nanofiber fracture surfaces indicated brittle fracture and slip of the oblique graphene layers of the nanofiber backbone. SEM and TEM images of matching ends at the rupture sites pointed to a failure geometry that agrees with the stacked truncated cone structure of vapor grown carbon nanofibers. Furthermore, pull-out experiments of individual vapor grown carbon nanofibers provided their average interfacial shear strength (IFSS) in EPON epoxy matrices. The IFSS for the non-surface-functionalized, high-temperature-heat-treated nanofiber-epoxy system averaged ∼55 MPa, revealing that the adhesion and bonding of the heat-treated, non-functionalized carbon nanofibers is quite better than that of non-functionalized carbon fibers (15-28 MPa) and as good as that of functionalized carbon fibers (40-65 MPa).

Original languageEnglish (US)
Title of host publication24th Annual Technical Conference of the American Society for Composites 2009 and 1st Joint Canadian-American Technical Conference on Composites
Pages1833-1849
Number of pages17
StatePublished - Dec 1 2009
Event24th Annual Technical Conference of the American Society for Composites 2009 and 1st Joint Canadian-American Technical Conference on Composites - Newark, DE, United States
Duration: Sep 15 2009Sep 17 2009

Publication series

Name24th Annual Technical Conference of the American Society for Composites 2009 and 1st Joint Canadian-American Technical Conference on Composites
Volume3

Other

Other24th Annual Technical Conference of the American Society for Composites 2009 and 1st Joint Canadian-American Technical Conference on Composites
CountryUnited States
CityNewark, DE
Period9/15/099/17/09

ASJC Scopus subject areas

  • Ceramics and Composites

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    Ozkan, T., Chen, Q., & Chasiotis, I. (2009). Mechanical and interfacial properties of individual vapor grown carbon nanofibers in epoxy matrices. In 24th Annual Technical Conference of the American Society for Composites 2009 and 1st Joint Canadian-American Technical Conference on Composites (pp. 1833-1849). (24th Annual Technical Conference of the American Society for Composites 2009 and 1st Joint Canadian-American Technical Conference on Composites; Vol. 3).