Structure-Property Relationships and Adhesion in Polyimides of Varying Aliphatic Content

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dc.contributor.authorEichstadt, Amy Elizabethen
dc.contributor.committeechairWard, Thomas C.en
dc.contributor.committeememberDillard, David A.en
dc.contributor.committeememberDillard, John G.en
dc.contributor.committeememberKander, Ronald G.en
dc.contributor.committeememberDavis, Richey M.en
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2014-03-14T20:14:15Zen
dc.date.adate2002-08-19en
dc.date.available2014-03-14T20:14:15Zen
dc.date.issued2002-07-16en
dc.date.rdate2003-08-19en
dc.date.sdate2002-07-24en
dc.description.abstractAromatic polyimides have found widespread applicability which can be partially attributed to their thermal stability, chemical resistance, and high glass transition temperature. However, deficiencies in their processability, solubility, transparency, and relatively high dielectric constants do not always provide the optimum properties for many specialty microelectronics applications. The incorporation of aliphatic segments to form partially aliphatic polyimides, has been used to counteract these shortcomings. Many of the potential uses of partially aliphatic polyimides require them to adhere to ceramic substrates, a main topic of this research. Polyimides and copolyimides that varied in chemical composition by their aliphatic content were characterized by their molecular weight, glass transition temperature, thermal stability, coefficient of thermal expansion, refractive index, dielectric behavior, and mechanical properties. Structure-property relationships were established. The gamma and beta sub-Tg viscoelastic relaxations were investigated to understand their molecular origins. The adhesion performance of a selected series of partially aliphatic polyimides to SiO2/Si was examined using a shaft loaded blister test, which was designed and instrumented for use in a dynamic mechanical analysis instrument. The adhesion was studied at high and low percent relative humidities and for several temperatures to examine if adhesion strength is influenced by polymer chemical composition. The adhesion energy could not be quantified for the entire series of polyimides. It was possible to interpret the quantitative adhesive fracture energies along with the qualitative adhesion strength behaviors, the failure surface analyses, and to offer an understanding of the adhesive chemical structure-physical property relationships. These understandings provide a conclusion that the incorporation of aliphatic segments into the polyimide chemical structure improves the durability of the adhesive bond to SiO2/Si under high percent relative humidities.en
dc.description.degreePh. D.en
dc.identifier.otheretd-07242002-225112en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07242002-225112/en
dc.identifier.urihttp://hdl.handle.net/10919/28379en
dc.publisherVirginia Techen
dc.relation.haspartEichstadt_dissertation_final.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectviscoelastic propertiesen
dc.subjectaliphatic diamineen
dc.subjectpolyimideen
dc.subjectadhesionen
dc.subjectshaft loaded blister testen
dc.subjectdielectric propertiesen
dc.subjectstructure-property relationsen
dc.titleStructure-Property Relationships and Adhesion in Polyimides of Varying Aliphatic Contenten
dc.typeDissertationen
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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