Polymer nanocomposites for high-temperature composite repair

dc.contributor.advisor Michael R. Kessler
dc.contributor.advisor Muffit Akinc
dc.contributor.author Sheng, Xia
dc.contributor.department Department of Materials Science and Engineering
dc.date 2018-08-11T08:56:28.000
dc.date.accessioned 2020-06-30T02:27:22Z
dc.date.available 2020-06-30T02:27:22Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2008
dc.date.embargo 2013-06-05
dc.date.issued 2008-01-01
dc.description.abstract <p>A novel repair agent for resin-injection repair of advanced high temperature composites was developed and characterized. The repair agent was based on bisphenol E cyanate ester (BECy) and reinforced with alumina nanoparticles. To ensure good dispersion and compatibility with the BECy matrix in nanocomposites, the alumina nanoparticles were functionalized with silanes. The BECy nanocomposites, containing bare and functionalized alumina nanoparticles, were prepared and evaluated for their thermal, mechanical, rheological, and viscoelastic properties.</p> <p>The monomer of BECy has an extremely low viscosity at ambient temperature, which is good for processability. The cured BECy polymer is a highly cross-linked network with excellent thermal mechanical properties, with a high glass transition temperature (Tg) of 270 yC and decomposition temperature above 350 yC. The incorporation of alumina nanoparticles enhances the mechanical and rheological properties of the BECy</p> <p>nanocomposites. Additionally, the alumina nanoparticles are shown to catalyze the cure of BECy.</p> <p>Characterization of the nanocomposites included dynamic mechanical analysis, differential scanning calorimetry, thermogravimetric analysis, rheological and rheokinetic</p> <p>evaluation, and transmission electron microscopy. The experimental results show that the BECy nanocomposite is a good candidate as repair agent for resin-injection repair</p> <p>applications.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/10282/
dc.identifier.articleid 1219
dc.identifier.contextkey 2736318
dc.identifier.doi https://doi.org/10.31274/etd-180810-626
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/10282
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/24500
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/10282/Sheng_iastate_0097E_10009.pdf|||Fri Jan 14 18:17:31 UTC 2022
dc.subject.disciplines Materials Science and Engineering
dc.subject.keywords alumina
dc.subject.keywords cyanate ester
dc.subject.keywords dynamic mechanical analysis
dc.subject.keywords dynamic scanning calorimetry
dc.subject.keywords nanoparticle
dc.subject.keywords thermoset
dc.title Polymer nanocomposites for high-temperature composite repair
dc.type dissertation
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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