Applicability of ft-ir techniques and goniometry on characterization of carbon fiber surfaces

Applicability of ft-ir techniques and goniometry on characterization of carbon fiber surfaces

Author Oliveira Junior, Mauro Santos Autor UNIFESP Google Scholar
Diniz, Milton Faria Google Scholar
Lazzarini Dutra, Rita de Cassia Google Scholar
Massi, Marcos Google Scholar
Otani, Choyu Google Scholar
Abstract Carbon fibers have been widely used as structural reinforcement in aeronautical composites, because of their exceptional mechanical properties. However, carbon fibers present few polar groups on their surfaces inducing a weak interaction with some thermosetting and thermoplastic matrices. Surface treatments, such as thermal and electrochemical oxidation, are generally followed by sizing in order to improve interfacial adhesion between carbon fibers and some matrices. The precise surface characterization, by means of its chemical groups and radical identification, has been pointed out as an effective tool of carbon fibers finishing assessment process. Goniometry and Fourier transform-infrared spectroscopy are widely used to characterize some materials applied in industry, but not for carbon fibers, mainly because of their filamentary shape and the high concentration of carbon even in their near surface. In this paper, unsized and sized Torayca T300 carbon fibers were characterized by goniometry tests to evaluate hydrophilic or hydrophobic character. Qualitatively, it was noticed the effect of sizing on carbon fibers by their hydrophilic behavior, which has not been observed in unsized samples. Chemical analysis was performed by Fourier transform-infrared spectroscopy using different setups: photoacoustic, attenuated total reflectance and universal attenuated total reflectance. The Fourier transform-infrared spectroscopy/attenuated total reflectance/Germanium was shown to be the most promising technique to analyze carbon fibers surface, despite the low level of relative intensities of some bands. By this technique, it was possible to observe differences between unsized and sized carbon fibers spectra.
Keywords Carbon Fiber
Infrared Spectroscopy
Wettability
Characterization
Surface PropertiesPlasma Treatment
Spectroscopy
Energy
Reflectance
Oxidation
Polymers
Language English
Date 2016
Published in Journal Of Aerospace Technology And Management. Sao paulo, v. 8, n. 1, p. 26-32, 2016.
ISSN 1984-9648 (Sherpa/Romeo, impact factor)
Publisher Inst aeronautica & espaco-iae
Extent 26-32
Origin http://dx.doi.org/10.5028/jatm.v8i1.537
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000371998500004
SciELO ID S2175-91462016000100026 (statistics in SciELO)
URI http://repositorio.unifesp.br/handle/11600/49579

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