Metal/polymer interactions in polyimide adhesives

dc.contributor.authorEllison, Matthew M.en
dc.contributor.committeechairTaylor, Larry T.en
dc.contributor.committeememberAnderson, Mark R.en
dc.contributor.committeememberDillard, John G.en
dc.contributor.committeememberHanson, Brian E.en
dc.contributor.committeememberWightman, James P.en
dc.contributor.departmentChemistryen
dc.date.accessioned2014-03-14T20:18:16Zen
dc.date.adate2006-11-08en
dc.date.available2014-03-14T20:18:16Zen
dc.date.issued1995-04-15en
dc.date.rdate2006-11-08en
dc.date.sdate2006-11-08en
dc.description.abstractDue to their superior thermal and chemical stability, polyimides are often used as adhesives in hazardous environments. This study examines the effect of thioether sulfur in the polyimide backbone on bond strength. X-ray photoelecton spectroscopy (XPS) and reflectance infrared spectroscopy indicated that certain metals catalyze the oxidation of the thioether sulfur. It was believed that this oxidation could lead to direct metal-oxygen-sulfur bonds across the polymer/metal interface which would serve to enhance interfacial strength. Bonds were made using substrates that were believed to catalyze the oxidation strongly (steel) and minimally (aluminum). In addition, non-sulfur containing polyimides with similar Tg were also studied for comparison. The polymer/metal interface was studied using both the T-peel and wedge tests. In some cases, oxidized sulfur was detected on the failed surfaces via XPS. No apparent effect was observed in the T-peel test, where the T-peel strengths of non-sulfur and sulfur containing polyimides were similar. In the wedge test, however, the sulfur containing BDSDA/ODA bonded to steel had an initial crack length of 34 mm. Even after eleven days the crack length was only 47 rnm, which was the initial crack length for the next best polyimide. Thus, metal-catalyzed oxidation of sulfur did take place, but not to an extent to have a noticeable effect on peel strength.en
dc.description.degreePh. D.en
dc.format.extentxxii, 237 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11082006-133622en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11082006-133622/en
dc.identifier.urihttp://hdl.handle.net/10919/29500en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1995.E455.pdfen
dc.relation.isformatofOCLC# 32883668en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectAdhesionen
dc.subjectSulfur oxidationen
dc.subjectSteelen
dc.subjectAluminumen
dc.subjectMagnetismen
dc.subject.lccLD5655.V856 1995.E455en
dc.titleMetal/polymer interactions in polyimide adhesivesen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineChemistryen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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