Anodic surface oxidation for pitch-based carbon fibers and the interfacial bond strengths in epoxy matrices

Akihiko Fukunaga, Shigetomo Ueda

Research output: Contribution to journalArticlepeer-review

110 Citations (Scopus)

Abstract

In order to investigate the mechanism of anodic surface oxidation, pitch-based high-modulus carbon fibers with different surface crystal sizes have been oxidized in 0.1 M NH4HCO3, and their differential double-layer capacity, C(d), and polarization resistance, R(p), in a buffer solution were measured by the coulostatic method. X-ray photoelectron spectroscopy and laser Raman spectroscopy were also employed to characterize the surfaces. The interfacial bond strengths in epoxy matrices were evaluated from the interlaminar shear strength (ILSS) or interfacial shear strength (IFSS). It was found that the values measured by the coulostatic method could be used for monitoring the effect of the anodic surface oxidation because there was a good correlation between C(d) and ILSS. From those characterizations, we have proposed that the mechanism of anodic oxidation of pitch-based carbon fibers is selective oxidation and the appearance of prismatic surfaces in the crevices, without a change in the surface crystal sizes. Since the prismatic surfaces have many sites that are chemically active with respect to epoxy resin, even after the fibers have been deoxidized, pitch-based carbon fibers show strong adhesion to epoxy resin. (C) 2000 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)249-254
Number of pages6
JournalComposites Science and Technology
Volume60
Issue number2
DOIs
Publication statusPublished - 2000 Feb 1
Externally publishedYes

Keywords

  • A. Carbon fibers
  • A. Polymer-matrix composites
  • B. Interfacial strength
  • B. Surface treatments
  • Electrochemical analysis

ASJC Scopus subject areas

  • Ceramics and Composites
  • Engineering(all)

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