Thermoplastic xylan derivatives and related blends

Simple item page
dc.contributor.authorRauschenberg, Nancy Carolen
dc.contributor.committeechairGlasser, Wolfgang G.en
dc.contributor.committeememberBaird, Donald G.en
dc.contributor.committeememberWilkes, Garth L.en
dc.contributor.departmentChemical Engineeringen
dc.date.accessioned2014-03-14T21:32:03Zen
dc.date.adate2010-03-17en
dc.date.available2014-03-14T21:32:03Zen
dc.date.issued1991en
dc.date.rdate2010-03-17en
dc.date.sdate2010-03-17en
dc.description.abstractThe relationship between substituent chemistry and melt behavior for xylan derivatives was investigated by differential scanning calorimetry and parallel-plate dynamic viscometric measurements. Xylan esters exhibit characteristic Tg values which decrease with increasing size of substituent. However, these materials do not flow at temperatures well above Tg. The ether derivative hydroxypropyl xylan was found to flow at substitution levels higher than 0.5 degree of substitution, with melt viscosity decreasing as the degree of substitution increased. The influence of viscosity ratio and composition on the texture of melt-blends of hydroxypropyl cellulose and polystyrene was studied for viscosity ratios of 0.08 to 0.55. Blends were examined by SEM and TEM. It was found that composition was the determining factor in texture, and not viscosity ratio over the range tested. Extrusion problems limited the range of compositions tested to 40% biopolymer or less. Phase inversion was not observed, although inversion was expected for some samples based on predictive models in the literature.en
dc.description.degreeMaster of Scienceen
dc.format.extentx, 85 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-03172010-020606en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03172010-020606/en
dc.identifier.urihttp://hdl.handle.net/10919/41711en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1991.R389.pdfen
dc.relation.isformatofOCLC# 29251044en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1991.R389en
dc.subject.lcshPolymer meltingen
dc.subject.lcshPolysaccharidesen
dc.subject.lcshXylansen
dc.titleThermoplastic xylan derivatives and related blendsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineChemical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
LD5655.V855_1991.R389.pdf
Size:
20.15 MB
Format:
Adobe Portable Document Format
Download

Collections

Masters Theses