Size Exclusion Chromatography of Poly(2-ethyl-2-oxazoline) Homopolymers and Poly(ethylene oxide)-b-Poly(2-ethyl-2-oxazoline) Copolymers

dc.contributor.authorBarnes, Suzanne R.en
dc.contributor.committeechairRiffle, Judy S.en
dc.contributor.committeememberMcGrath, James E.en
dc.contributor.committeememberDavis, Richey M.en
dc.contributor.departmentMacromolecular Science and Engineeringen
dc.date.accessioned2014-01-19T09:00:12Zen
dc.date.available2014-01-19T09:00:12Zen
dc.date.issued2014-01-18en
dc.description.abstractSize exclusion chromatography is the method of choice for characterizing molecular weights and molecular weight distributions of polymers. An important advancement in SEC is multidetection SEC which includes multi-angle laser light scattering, viscometry, refractive index and UV spectroscopy to analyze block and graft copolymers as well as polymers with oligomeric molecular weights. Oligomeric molecular weights present special challenges since the light scattering and viscosity detectors are more sensitive to higher molecular weights and both detectors have low molecular weight threshold values. The molecular weights and distributions of poly(2-ethyl-2-oxazoline) oligomers and block copolymers as well as poly(2-ethyl-2-oxazoline) were investigated by SEC using multiple detectors. Both a universal calibration method and light scattering were used to determine molecular weights and molecular weight distributions. The solvent was N-methylpyrrolidone that contained 0.05M LiBr used to minimize interactions among the polymers and solvent. SEC was used to establish that the diblock copolymers had heterogeneous compositional distributions. The low molecular weights of the diblock and homopolymer made it necessary to use the universal calibration method with combined refractive index and viscometry detectors to determine absolute molecular weights.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:1981en
dc.identifier.urihttp://hdl.handle.net/10919/24907en
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectSize Exclusion Chromatographyen
dc.subjectmulti-angle laser light scattering detectoren
dc.subjectrefractive index detectoren
dc.subjectdn/dcen
dc.subjectviscosity detectoren
dc.subjectuniversal calibrationen
dc.subjectpoly(2-ethyl-2-oxazoline)en
dc.subjectpoly(ethylene oxide)en
dc.titleSize Exclusion Chromatography of Poly(2-ethyl-2-oxazoline) Homopolymers and Poly(ethylene oxide)-b-Poly(2-ethyl-2-oxazoline) Copolymersen
dc.typeThesisen
thesis.degree.disciplineMacromolecular Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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