{"id":{"repo_id":"unt","oai_identifier":"info:ark/67531/metadc4745"},"canonical_url":"https://search.dev.ndltd.org/etd/unt/info:ark/67531/metadc4745","repository":{"repo_id":"unt","name":"University of North Texas","base_url":"https://digital.library.unt.edu/oai/"},"display":{"title":"Saturation and foaming of thermoplastic nanocomposites using supercritical CO2.","abstract":"Polystyrene (PS) nanocomposite foams were prepared using supercritical fluid (SCF) CO2 as a solvent and blowing agent. PS was first in-situ polymerized with a range of concentrations of montmorillonite layered silicate (MLS). The polymerized samples were then compression molded into 1 to 2mm thick laminates. The laminates were foamed in a batch supercritical CO2 process at various temperatures and pressures from 60°-85°C and 7.6-12MPa. The resulting foams were analyzed by scanning electron microscopy to determine effect of MLS on cellular morphology. Differential scanning calorimetry was used to determine the impact of nanocomposite microstructure on glass transition of the foamed polymer. X-ray diffraction spectra suggested that the PS/MLS composite had an intercalated structure at both the 1% and 3% mixtures, and that the intercalation may be enhanced by the foaming process.","abstract_html":"Polystyrene (PS) nanocomposite foams were prepared using supercritical fluid (SCF) CO2 as a solvent and blowing agent. PS was first in-situ polymerized with a range of concentrations of montmorillonite layered silicate (MLS). The polymerized samples were then compression molded into 1 to 2mm thick laminates. The laminates were foamed in a batch supercritical CO2 process at various temperatures and pressures from 60°-85°C and 7.6-12MPa. The resulting foams were analyzed by scanning electron microscopy to determine effect of MLS on cellular morphology. Differential scanning calorimetry was used to determine the impact of nanocomposite microstructure on glass transition of the foamed polymer. X-ray diffraction spectra suggested that the PS/MLS composite had an intercalated structure at both the 1% and 3% mixtures, and that the intercalation may be enhanced by the foaming process.","abstract_has_math":false,"creators":["Strauss, William C."],"institution":"University of North Texas","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["D'Souza, Nandika Anne, 1967-","Brostow, Witold, 1934-","Reidy, Richard","Purinton, Donald"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2005,"date_issued":"2005-05","date_published":"2005-05","updated_at":"2026-07-24T05:35:09Z","subjects":["Thermoplastic composites.","Nanostructured materials.","Polystyrene.","X-ray Diffraction","nanocomposite foams","supercritical CO2","glass transition","montmorillonite layered silicate"],"languages":["English"],"rights":["Public","Copyright","Strauss, William C.","Copyright is held by the author, unless otherwise noted. All rights reserved."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["oclc: 70272387","https://digital.library.unt.edu/ark:/67531/metadc4745/","ark: ark:/67531/metadc4745"],"render_values":[{"text":"oclc: 70272387","href":null,"code":true},{"text":"https://digital.library.unt.edu/ark:/67531/metadc4745/","href":"https://digital.library.unt.edu/ark:/67531/metadc4745/","code":true},{"text":"ark: ark:/67531/metadc4745","href":null,"code":true}]}]},"links":{"outbound_url":"https://doi.org/10.12794/metadc4745","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["D'Souza, Nandika Anne, 1967-","Brostow, Witold, 1934-","Reidy, Richard","Purinton, Donald"]},{"key":"dc:creator","label":"Author","values":["Strauss, William C."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2005-05"]},{"key":"dc:publisher","label":"Institution","values":["University of North Texas"]},{"key":"dc:type","label":"Dc Type","values":["Thesis or Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Thermoplastic composites.","Nanostructured materials.","Polystyrene.","X-ray Diffraction","nanocomposite foams","supercritical CO2","glass transition","montmorillonite layered silicate"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]},{"key":"dc:rights","label":"Dc Rights","values":["Public","Copyright","Strauss, William C.","Copyright is held by the author, unless otherwise noted. All rights reserved."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["oclc: 70272387","doi: 10.12794/metadc4745","https://digital.library.unt.edu/ark:/67531/metadc4745/","ark: ark:/67531/metadc4745"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Polystyrene (PS) nanocomposite foams were prepared using supercritical fluid (SCF) CO2 as a solvent and blowing agent. PS was first in-situ polymerized with a range of concentrations of montmorillonite layered silicate (MLS). The polymerized samples were then compression molded into 1 to 2mm thick laminates. The laminates were foamed in a batch supercritical CO2 process at various temperatures and pressures from 60°-85°C and 7.6-12MPa. The resulting foams were analyzed by scanning electron microscopy to determine effect of MLS on cellular morphology. Differential scanning calorimetry was used to determine the impact of nanocomposite microstructure on glass transition of the foamed polymer. X-ray diffraction spectra suggested that the PS/MLS composite had an intercalated structure at both the 1% and 3% mixtures, and that the intercalation may be enhanced by the foaming process."]},{"key":"dc:format","label":"Dc Format","values":["Text"]},{"key":"dc:title","label":"Title","values":["Saturation and foaming of thermoplastic nanocomposites using supercritical CO2."]}]}],"canonical_facts":{"dc:contributor":["D'Souza, Nandika Anne, 1967-","Brostow, Witold, 1934-","Reidy, Richard","Purinton, Donald"],"dc:creator":["Strauss, William C."],"dc:date":["2005-05"],"dc:description":["Polystyrene (PS) nanocomposite foams were prepared using supercritical fluid (SCF) CO2 as a solvent and blowing agent. PS was first in-situ polymerized with a range of concentrations of montmorillonite layered silicate (MLS). The polymerized samples were then compression molded into 1 to 2mm thick laminates. The laminates were foamed in a batch supercritical CO2 process at various temperatures and pressures from 60°-85°C and 7.6-12MPa. The resulting foams were analyzed by scanning electron microscopy to determine effect of MLS on cellular morphology. Differential scanning calorimetry was used to determine the impact of nanocomposite microstructure on glass transition of the foamed polymer. X-ray diffraction spectra suggested that the PS/MLS composite had an intercalated structure at both the 1% and 3% mixtures, and that the intercalation may be enhanced by the foaming process."],"dc:format":["Text"],"dc:identifier":["oclc: 70272387","doi: 10.12794/metadc4745","https://digital.library.unt.edu/ark:/67531/metadc4745/","ark: ark:/67531/metadc4745"],"dc:language":["English"],"dc:publisher":["University of North Texas"],"dc:rights":["Public","Copyright","Strauss, William C.","Copyright is held by the author, unless otherwise noted. All rights reserved."],"dc:subject":["Thermoplastic composites.","Nanostructured materials.","Polystyrene.","X-ray Diffraction","nanocomposite foams","supercritical CO2","glass transition","montmorillonite layered silicate"],"dc:title":["Saturation and foaming of thermoplastic nanocomposites using supercritical CO2."],"dc:type":["Thesis or Dissertation"]},"updated_at":"2026-07-24T05:35:09Z"}