Thermal and Morphological Study of Segmented Multiblock Copolyesters Containing 2,2,4,4-Tetramethyl-1,3-cyclobutanediol

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dc.contributor.authorDixit, Ninaden
dc.contributor.committeechairMoore, Robert Bowen IIIen
dc.contributor.committeememberTurner, S. Richarden
dc.contributor.committeememberLong, Timothy E.en
dc.contributor.committeememberMarand, Hervé L.en
dc.contributor.departmentChemistryen
dc.date.accessioned2014-03-14T21:36:12Zen
dc.date.adate2012-06-08en
dc.date.available2014-03-14T21:36:12Zen
dc.date.issued2012-04-16en
dc.date.rdate2012-06-08en
dc.date.sdate2012-05-15en
dc.description.abstractThermal and morphological studies of the segmented multiblock copolyesters containing 2,2,4,4-tetramethyl-1,3-cyclobutanediol and dimethyl-1,4-cyclohexane dicarboxylate were carried out using differential scanning calorimetry, small angle X-ray scattering, wide angle X-ray diffraction and dynamic mechanical analysis. Molecular origins of the thermal transitions appearing in copolyesters were assigned by the copolyester analysis at different temperatures. The hard segments in copolyesters underwent short-range and long-range ordering (crystallization) during cooling or annealing above glass transition temperature, as concluded from thermal and wide angle X-ray diffraction analysis. Annealing process affected the ordering in hard segments and annealing temperatures of 160 °C and above led to increased microphase mixing. The small angle X-ray scattering studies confirmed the microphase separated morphology of copolyesters and supported the argument of increased microphase mixing in copolyesters annealed at higher temperatures. The amount of sulfonate containing co-monomer and its presence in either hard or soft microphase affected the morphology of the copolyesters. Introduction of the sulfonate groups led to increased microphase mixing in copolyesters as well as destruction of long-range order in the hard segments.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-05152012-225535en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05152012-225535/en
dc.identifier.urihttp://hdl.handle.net/10919/42669en
dc.publisherVirginia Techen
dc.relation.haspartDixit_NY_T_2012_Copyright.pdfen
dc.relation.haspartDixit_NY_T_2012_2.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectsegmented block copolyesteren
dc.subjectmorphologyen
dc.subjectdifferential scanning calorimetryen
dc.subjectsmall angle X-ray scatteringen
dc.subjectglass transitionen
dc.subjectmicrophase separationen
dc.titleThermal and Morphological Study of Segmented Multiblock Copolyesters Containing 2,2,4,4-Tetramethyl-1,3-cyclobutanediolen
dc.typeThesisen
thesis.degree.disciplineChemistryen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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