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case1054570728.pdf (3.29 MB)
ETD Abstract Container
Abstract Header
Surface characterization of carbon fibers and interfacial phenomena in carbon reinforced composites
Author Info
Sellitti, Claudio
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=case1054570728
Abstract Details
Year and Degree
1990, Doctor of Philosophy, Case Western Reserve University, Chemistry.
Abstract
A graphitized carbon fiber has been oxidized and its surface has been studied by Fourier transform infrared attenuated total reflection spectroscopy (FTIR-ATR). The spectra of the samples oxidized for different times are compared and the bands at 1720 cm
-1
and 1580 cm
-1
, arising from the oxidative treatment, followed as a function oxidation time. A curve fitting program has been used to separate the contribution of different functional groups to the relatively broad, composite peaks arising from the oxidation treatment. Tentative assignments are presented here. After oxidation, we detect the presence of carboxylic acid (1705 cm
-1
), ester (1730 cm
-1
), lactone (1750 cm
-1
), enol (1640 cm
-1
), and quinone structure (1583-1570 cm
-1
) moieties as well as a product due to the nitration of the aromatic ring (1545 cm
-1
). Some of the assignments of the chemical functionalities present on the fibers have also been verified by designing and performing appropriate specific derivatization reactions on these functional groups. The results of such reactions with aniline, epichlorohydrin, lithium aluminium hydride, sodium hydroxid e and epoxy resin coating are reported here. The oxidized carbon fiber has been modeled as a thin polymeric film, representing the surface species, coated with a graphite overlayer. Optical theory has been utilized to calculate the variations in the electric field intensities, occurring when the graphite layer is overlayed on a film of PVAc (Polyvinylacetate). The increase of the <E z2> component has been observed. Spectral simulations based on Hansen's formulas, clearly show the enhancement of the infrared absorbances. The entity of the enhancement result to be dependent from the air gap thickness, existing between the germanium element and the polymeric film, and the nature of the substrates. Fourier transform infrared attenuated total reflection spectroscopy has also been utilized to monitor the influence of the surface species on the curing of an epoxy system. A curve fitting program is used to deconvolve the overlapped infrared bands. The integrated intensities of the ester, anhydride, epoxy, and carboxylic acid, plotted against the curing time, clearly show the dependence of the crosslinking process on the concentration of the surface species. The surface groups themselves act as a catalyst: there exists an optimal concentration below which an activation of the curing process occurs. Above that concentration, a retardation of the curing process has been detected.
Committee
Hatsuo Ishida (Advisor)
Pages
177 p.
Subject Headings
Chemistry, Polymer
Keywords
Surface characterization carbon fibers interfacial phenomena carbon reinforced composites
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Citations
Sellitti, C. (1990).
Surface characterization of carbon fibers and interfacial phenomena in carbon reinforced composites
[Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1054570728
APA Style (7th edition)
Sellitti, Claudio.
Surface characterization of carbon fibers and interfacial phenomena in carbon reinforced composites.
1990. Case Western Reserve University, Doctoral dissertation.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=case1054570728.
MLA Style (8th edition)
Sellitti, Claudio. "Surface characterization of carbon fibers and interfacial phenomena in carbon reinforced composites." Doctoral dissertation, Case Western Reserve University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=case1054570728
Chicago Manual of Style (17th edition)
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Document number:
case1054570728
Download Count:
2,428
Copyright Info
© 1990, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.