{"id":{"repo_id":"wichita-thes","oai_identifier":"oai:soar.wichita.edu:10057/5357"},"canonical_url":"https://search.dev.ndltd.org/etd/wichita-thes/oai:soar.wichita.edu:10057/5357","repository":{"repo_id":"wichita-thes","name":"Wichita State University","base_url":"https://soar.wichita.edu/oai/request"},"display":{"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","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.","abstract_html":"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.","abstract_has_math":false,"creators":["Gibson, Irish Alcalen"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-05","date_published":"2012-05","updated_at":"2026-07-24T06:06:46Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["hdl:10057/5357"],"render_values":[{"text":"hdl:10057/5357","href":null,"code":true}]}]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.issued","label":"Date","values":["2012-05"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["hdl:10057/5357"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.other","label":"Dc Description Other","values":["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."]},{"key":"dc:title","label":"Title","values":["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"]}]}],"canonical_facts":{"dc:date.issued":["2012-05"],"dc:description.other":["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."],"dc:identifier":["hdl:10057/5357"],"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"],"dc:type":["Dissertation"]},"updated_at":"2026-07-24T06:06:46Z"}