Adhesion study of thermoplastic polymides with Ti-6Al-4V alloy and PEEK-graphite composites

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dc.contributor.authorYoon, Tae-Hoen
dc.contributor.committeechairMcGrath, James E.en
dc.contributor.committeememberWard, Thomas C.en
dc.contributor.committeememberWightman, James P.en
dc.contributor.committeememberEiss, Norman S.en
dc.contributor.committeememberRiffle, Judyen
dc.contributor.departmentMaterials Engineering Scienceen
dc.date.accessioned2014-03-14T21:16:27Zen
dc.date.adate2008-07-28en
dc.date.available2014-03-14T21:16:27Zen
dc.date.issued1991en
dc.date.rdate2008-07-28en
dc.date.sdate2008-07-28en
dc.description.abstractHigh glass transition (eg. 360 °C) melt processable thermoplastic polyimide homopolymers and poly(imide-siloxane) segmented copolymers were prepared from a number of diamines and dianhydrides via solution imidization, polydimethylsiloxane segment incorporation and molecular weight control with non-reactive phthalimide end-groups. The adhesive bond performance of these polyimides was investigated as a function of molecular weight, siloxane incorporation, residual solvent, test temperature, and polyimide structure via single lap shear samples prepared from treated Ti-6AI-4V alloy adherends and compression molded film adhesives or scrim cloth adhesives. The adhesive bond strengths increased greatly with siloxane segment incorporation at 10, 20 and 30 weight percent, and decreased slightly with total polymer molecular weight. As the test temperature was increased, adhesive bond strength increased, decreased or showed a maximum at some temperatures depending on the polyimide structure and siloxane content. The presence of residual solvent increased adhesive bond strength at ambient temperature but decreased the strength at the elevated temperatures. The variation of adhesive bond strength with residual solvent, siloxane and test temperature was attributed to the influence of these parameters on the brittle-ductile transition behavior of the polyimide system. This conclusion was supported by stress-strain measurements which indicated that tensile strength and modulus decreased with siloxane concentration and test temperature, demonstrating that there was an optimum combination of strength and strain for maximum adhesive bond strength. A model was developed to describe this behavior. The poly(imide-30%siloxane) segmented copolymer and a miscible poly(ether-imide) also demonstrated excellent adhesive bond strength with poly(arylene ether ketone) PEEK®-graphite composites. Oxygen or ammonia gas plasma treatment was very effective in further improving adhesive bond strength of melt laminated PEEK®-graphite composites.en
dc.description.degreePh. D.en
dc.format.extentxvi, 223 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-07282008-134525en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07282008-134525/en
dc.identifier.urihttp://hdl.handle.net/10919/38884en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1991.Y667.pdfen
dc.relation.isformatofOCLC# 24707022en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1991.Y667en
dc.subject.lcshAdhesionen
dc.subject.lcshThermoplastic compositesen
dc.titleAdhesion study of thermoplastic polymides with Ti-6Al-4V alloy and PEEK-graphite compositesen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineMaterials Engineering Scienceen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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