Effect of photoageing and plasticizer content on the mechanical and adhesive properties of polyvinylbutyral

dc.contributor.authorMay, Raymond Jeffreyen
dc.contributor.committeechairLove, Brian J.en
dc.contributor.committeememberKander, Ronald G.en
dc.contributor.committeememberDillard, David A.en
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2014-03-14T21:48:42Zen
dc.date.adate2008-11-01en
dc.date.available2014-03-14T21:48:42Zen
dc.date.issued1996en
dc.date.rdate2008-11-01en
dc.date.sdate2008-11-01en
dc.description.abstractThe objective of this study is to characterize the mechanical and adhesive properties of polyvinylbutyral and determine the effect of plasticizer content and photoageing on these properties. This data would be used to understand how the performance of laminated safety glass is related to the choice of adhesive interlayer. Samples of PVB plasticized with 0 to 40% butyl benzyl phthalate by weight were analyzed using a single strain rate tensile test, dynamic mechanical thermal analysis and a 1350 peel test. Two regimes of behavior were identified. PVB with low plasticizer contents, up to 10%, acts as a glassy polymer at room temperature. At higher plasticizer concentrations, greater than 20%, the material becomes elastomeric, with increased ductility and decreased moduli. The adhesive strength of each of the formulations was similar if compared at their respective glass transition temperatures. At room temperature, the heavily plasticized formulations had good adhesive strength whereas the less plasticized formulations readily debonded from the glass. These results suggest that PVB plasticized with between 20 and 40% plasticizer content is highly suitable as an interlayer material. UV radiation exposure was used to simulate the effect of sunlight on PVB. Forty micron thick samples were irradiated for up to 1000 hours of exposure time and analyzed using FTIR spectroscopy. It was determined that photo degradation had occurred in the form of a breakdown of the acetal ring structure in the vinyl butyral function. Similar treatment of 0.75 mm thick samples produced no major degradation in the mechanical or adhesive properties of the material. This is an unexpected result that conflicts with the obvious degradation discovered during FTIR spectroscopic testing. This is most likely due to the increased thickness of the mechanical samples and corresponding lo\ver UV dosage per polymer chain.en
dc.description.degreeMaster of Scienceen
dc.format.extentx, 107 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11012008-063404en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11012008-063404/en
dc.identifier.urihttp://hdl.handle.net/10919/45399en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1996.M382.pdfen
dc.relation.isformatofOCLC# 35718182en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectpolyvinylbutyralen
dc.subjectphotoageingen
dc.subjectsafety glassen
dc.subjectUV degradationen
dc.subjectmodulusen
dc.subject.lccLD5655.V855 1996.M382en
dc.titleEffect of photoageing and plasticizer content on the mechanical and adhesive properties of polyvinylbutyralen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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