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dc.contributor.authorEllison, Matthew M.en_US
dc.date.accessioned2014-03-14T20:18:16Z
dc.date.available2014-03-14T20:18:16Z
dc.date.issued1995-04-15en_US
dc.identifier.otheretd-11082006-133622en_US
dc.identifier.urihttp://hdl.handle.net/10919/29500
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_US
dc.format.mediumBTDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartLD5655.V856_1995.E455.pdfen_US
dc.subjectAdhesionen_US
dc.subjectSulfur oxidationen_US
dc.subjectSteelen_US
dc.subjectAluminumen_US
dc.subjectMagnetismen_US
dc.subject.lccLD5655.V856 1995.E455en_US
dc.titleMetal/polymer interactions in polyimide adhesivesen_US
dc.typeDissertationen_US
dc.contributor.departmentChemistryen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineChemistryen_US
dc.contributor.committeechairTaylor, Larry T.en_US
dc.contributor.committeememberAnderson, Mark R.en_US
dc.contributor.committeememberDillard, John G.en_US
dc.contributor.committeememberHanson, Brian E.en_US
dc.contributor.committeememberWightman, John P.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11082006-133622/en_US
dc.date.sdate2006-11-08en_US
dc.date.rdate2006-11-08
dc.date.adate2006-11-08en_US


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