Molecular order at polymer surfaces via X-ray photoelectron spectroscopy

dc.contributor.authorBarragan, Leonardo C. Lopezen
dc.contributor.departmentMaterials Engineeringen
dc.description.abstractMolecular order in surfaces is probed for several different repeat unit Spectroscopy (XPS) is chemistries. X-ray Photoelectron used, particularly with angular dependence, to obtain the compositional gradient information from the top 6 run of the surface. It is found that all materials investigated present some kind of preferential and reproducible ordering effect. The ordering ef feet can be present in different forms, such as preferential segregation of a crystalline block to the surface, segregation of a component of different crystalline structure to the surface or orientation of a backbone segment of the polymer towards the surface of the specimen. Polyethylene terephthalate shows an increasing amount of crystalline cyclic oligomer at the surface as the degree of crystallinity of the matrix increases. Block copolyesters unsaturated blocks present containing saturated and the saturated blocks preferentially segregated toward the surface. Crystalline ethylene/chlorotrifluoroethylene alternating copolymer shows the preferential orientation of ethylene groups closer to the surface. The linear polyurethanes studied reveal the surfaces enriched with soft segments, whereas no enrichment was observed for a crosslinked polyurethane.en
dc.description.degreeMaster of Scienceen
dc.format.extentxi, 125 leavesen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 11653170en
dc.rightsIn Copyrighten
dc.subject.lccLD5655.V855 1984.B376en
dc.subject.lcshMaterials -- Testingen
dc.subject.lcshSurfaces (Physics)en
dc.titleMolecular order at polymer surfaces via X-ray photoelectron spectroscopyen
dc.type.dcmitypeTexten Engineeringen Polytechnic Institute and State Universityen of Scienceen


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