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Applications of diffuse reflectance near-infrared spectroscopy and cure kinetics study by differential scanning calorimetry to selected thermosetting polymer-based systems of interest in the aviation industry

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dc.contributor.advisor Eichhorn, David M.
dc.contributor.advisor Stevenson, William T.K.
dc.contributor.author Gibson, Irish Alcalen
dc.date.accessioned 2012-11-14T21:53:05Z
dc.date.available 2012-11-14T21:53:05Z
dc.date.copyright 2012
dc.date.issued 2012-05
dc.identifier.other d12007
dc.identifier.uri http://hdl.handle.net/10057/5357
dc.description Thesis (Ph.D.)--Wichita State University, College of Liberal Arts and Sciences, Dept. of Chemistry en_US
dc.description.abstract Diffuse Reflectance Near-Infrared (near-IR) Spectroscopy combined with Partial Least Squares (PLS) regression was used to determine the moisture content and degree of cure in unfilled epoxy resins, carbon-reinforced epoxy resin and epoxy resin adhesives. PLS-generated calibration curves were consistently superior than the calibration curves based on Beer’s law. The same technique was also applied to polyimide-based prepregs to determine the degree of cure through the softening temperature, Ts. In both epoxy-based and polyimide-based systems, good correlations were established between the near-IR spectra and the properties of interest. The combination of the rapid, non-destructive technique coupled with a sophisticated chemometric software shows promise as a reliable technique that could be of great benefit to the aviation industry. Another aspect of this study was the evaluation of an epoxy resin prepreg as a candidate material to be used in repair scenarios in the aviation industry. The prepreg was partially characterized using mid-IR and 1H NMR spectroscopies indicating that it contains diglycidyl ether of bisphenol-A (DGEBA) and diamino diphenyl sulfone (DDS) as a curing agent. Ramp and soak experiments using the Differential Scanning Calorimetry (DSC) were performed to study the cure kinetics. A recommended cure cycle was determined to be a combination of a dynamic heating to 150-155 °C at 2 °C/min and an isothermal heating at the end temperature for 20 minutes. en_US
dc.format.extent xv, 144 p. en
dc.language.iso en_US en_US
dc.publisher Wichita State University en_US
dc.rights Copyright Irish Alcalen Gibson, 2012. All rights reserved en
dc.subject.lcsh Electronic dissertations en
dc.title Applications of diffuse reflectance near-infrared spectroscopy and cure kinetics study by differential scanning calorimetry to selected thermosetting polymer-based systems of interest in the aviation industry en_US
dc.type Dissertation

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