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Improving the Exfoliation of Layered Silicate in a Poly(ethylene terephthalate) Matrix Using Supercritical Carbon Dioxide

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dc.contributor.authorSamaniuk, Joseph Reeseen
dc.contributor.committeechairBaird, Donald G.en
dc.contributor.committeememberWalz, John Y.en
dc.contributor.committeememberDavis, Richey M.en
dc.contributor.departmentChemical Engineeringen
dc.date.accessioned2014-03-14T20:35:00Zen
dc.date.adate2008-05-27en
dc.date.available2014-03-14T20:35:00Zen
dc.date.issued2008-04-29en
dc.date.rdate2008-05-27en
dc.date.sdate2008-05-04en
dc.description.abstractSupercritical carbon dioxide (scCO2) was used as a processing aid to improve the level of exfoliation achievable in a PET-layered silicate nanocomposite produced from melt compounding. Layered silicate and scCO2 were allowed to mix for a period of time before being released into the second stage of a single screw extruder. The rapid expansion forced silicate particles into a modified hopper containing neat PET pellets. The mixture of layered silicate and PET was immediately melt mixed in a single screw extruder, cooled in a water bath and pelletized. Two sets of samples each containing layered silicate with different surface chemistries were produced with this method at 1, 3 and 5 wt% silicate. For comparison, samples of the same weight fraction and type of silicate were produced from a traditional melt compounding method. Wide angle x-ray diffraction (WAXD), mechanical testing and rheological analysis were used in order to characterize the silicate morphology, the composite mechanical properties and the relative amount of degradation between the various samples. Results show that scCO2 processed samples contain a higher degree of layered silicate exfoliation than samples produced with traditional melt compounding. Mechanical property improvements are shown to be dependent on the type of silicate surface modification employed. Finally, degradation of the PET matrix appears to be far less extensive in the scCO2 processed samples as shown from rheological data.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-05042008-010025en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05042008-010025/en
dc.identifier.urihttp://hdl.handle.net/10919/32187en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartJoeS-ETD-Edited(2).pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectPLSNen
dc.subjectpolymer-layered silicate nanocompositeen
dc.subjectpoly(ethylene terephthalate)en
dc.subjectsupercritical carbon dioxideen
dc.subjectnanoclayen
dc.titleImproving the Exfoliation of Layered Silicate in a Poly(ethylene terephthalate) Matrix Using Supercritical Carbon Dioxideen
dc.typeThesisen
thesis.degree.disciplineChemical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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