Dielectric characterization of high-performance spaceflight materials

dc.contributor.advisor Nicola Bowler
dc.contributor.author Kleppe, Nathan
dc.contributor.department Materials Science and Engineering
dc.date 2018-08-11T08:49:26.000
dc.date.accessioned 2020-06-30T02:53:58Z
dc.date.available 2020-06-30T02:53:58Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 2014
dc.date.embargo 2015-07-30
dc.date.issued 2014-01-01
dc.description.abstract <p>As commercial space travel increases, the need for reliable structural health monitoring to predict possible weaknesses or failures of structural materials also increases. Monitoring of polymer-based materials may be achieved through the use of dielectric spectroscopy by comparing permittivity or conductivity measurements performed on a sample in use to that of a pristine sample. Changes in these measured values or of the relaxation frequencies, if present, can indicate chemical or physical changes occurring within the material and the possible need for maintenance/replacement. In this work, we established indicative trends that occur in the dielectric spectra during accelerated aging of various high-performance polymeric materials (EVOH, PEEK, PPS, and UHMWPE). Uses for these materials range from electrical insulation and protective coatings to windows and air- or space-craft parts that may be subject to environmental damage over long-term operation. Accelerated thermal aging and ultraviolet/water-spray cyclic aging were performed in order to investigate the degradation of the aforementioned material. The Havriliak-Negami model was used in the analysis of the measured dielectric spectra in order to obtain the characteristic fit parameters from which aging-related trends were identified. With reference to the literature and from measured FTIR spectra, observations were connected to the underlying mechanisms causing the dielectric relaxations.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/14045/
dc.identifier.articleid 5052
dc.identifier.contextkey 6199780
dc.identifier.doi https://doi.org/10.31274/etd-180810-3447
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/14045
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/28232
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/14045/Kleppe_iastate_0097M_14463.pdf|||Fri Jan 14 20:12:43 UTC 2022
dc.subject.disciplines Engineering
dc.subject.disciplines Mechanics of Materials
dc.title Dielectric characterization of high-performance spaceflight materials
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
thesis.degree.level thesis
thesis.degree.name Master of Science
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