Show simple item record

dc.contributor.advisorEichhorn, David M.
dc.contributor.advisorStevenson, William T.K.
dc.contributor.authorGibson, Irish Alcalen
dc.date.accessioned2012-11-14T21:53:05Z
dc.date.available2012-11-14T21:53:05Z
dc.date.copyright2012
dc.date.issued2012-05
dc.identifier.otherd12007
dc.identifier.urihttp://hdl.handle.net/10057/5357
dc.descriptionThesis (Ph.D.)--Wichita State University, College of Liberal Arts and Sciences, Dept. of Chemistryen_US
dc.description.abstractDiffuse 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.extentxv, 144 p.en
dc.language.isoen_USen_US
dc.publisherWichita State Universityen_US
dc.rightsCopyright Irish Alcalen Gibson, 2012. All rights reserveden
dc.subject.lcshElectronic dissertationsen
dc.titleApplications 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 industryen_US
dc.typeDissertation


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record