Applicability of FT-IR Techniques and Goniometry on Characterization of Carbon Fiber Surfaces
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 t...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Instituto de Aeronáutica e Espaço (IAE)
2016-03-01
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| Series: | Journal of Aerospace Technology and Management |
| Subjects: | |
| Online Access: | https://www.jatm.com.br/jatm/article/view/537 |
| _version_ | 1818096456323563520 |
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| author | Mauro Santos de Oliveira Junior Milton Faria Diniz Rita de Cássia Lazzarini Dutra Marcos Massi Choyu Otani |
| author_facet | Mauro Santos de Oliveira Junior Milton Faria Diniz Rita de Cássia Lazzarini Dutra Marcos Massi Choyu Otani |
| author_sort | Mauro Santos de Oliveira Junior |
| collection | DOAJ |
| description |
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 transforminfrared 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.
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| first_indexed | 2024-12-10T23:04:55Z |
| format | Article |
| id | doaj.art-92e16753c6694a7b8558e4b892d59560 |
| institution | Directory Open Access Journal |
| issn | 2175-9146 |
| language | English |
| last_indexed | 2024-12-10T23:04:55Z |
| publishDate | 2016-03-01 |
| publisher | Instituto de Aeronáutica e Espaço (IAE) |
| record_format | Article |
| series | Journal of Aerospace Technology and Management |
| spelling | doaj.art-92e16753c6694a7b8558e4b892d595602022-12-22T01:30:04ZengInstituto de Aeronáutica e Espaço (IAE)Journal of Aerospace Technology and Management2175-91462016-03-0181Applicability of FT-IR Techniques and Goniometry on Characterization of Carbon Fiber SurfacesMauro Santos de Oliveira Junior0Milton Faria Diniz1Rita de Cássia Lazzarini Dutra2Marcos Massi3Choyu Otani4Universidade Federal de São Paulo; Instituto Tecnológico de AeronáuticaInstituto de Aeronáutica e EspaçoInstituto Tecnológico de Aeronáutica; Instituto de Aeronáutica e EspaçoUniversidade Federal de São Paulo; Instituto Tecnológico de AeronáuticaInstituto Tecnológico de Aeronáutica 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 transforminfrared 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. https://www.jatm.com.br/jatm/article/view/537carbon fiberscomposite materialshydrophobicityinfrared spectroscopyinterfacessurface properties. |
| spellingShingle | Mauro Santos de Oliveira Junior Milton Faria Diniz Rita de Cássia Lazzarini Dutra Marcos Massi Choyu Otani Applicability of FT-IR Techniques and Goniometry on Characterization of Carbon Fiber Surfaces Journal of Aerospace Technology and Management carbon fibers composite materials hydrophobicity infrared spectroscopy interfaces surface properties. |
| title | Applicability of FT-IR Techniques and Goniometry on Characterization of Carbon Fiber Surfaces |
| title_full | Applicability of FT-IR Techniques and Goniometry on Characterization of Carbon Fiber Surfaces |
| title_fullStr | Applicability of FT-IR Techniques and Goniometry on Characterization of Carbon Fiber Surfaces |
| title_full_unstemmed | Applicability of FT-IR Techniques and Goniometry on Characterization of Carbon Fiber Surfaces |
| title_short | Applicability of FT-IR Techniques and Goniometry on Characterization of Carbon Fiber Surfaces |
| title_sort | applicability of ft ir techniques and goniometry on characterization of carbon fiber surfaces |
| topic | carbon fibers composite materials hydrophobicity infrared spectroscopy interfaces surface properties. |
| url | https://www.jatm.com.br/jatm/article/view/537 |
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