{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/43139"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/43139","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"Evaluation and design of polymer systems for enhanced microwave heating","abstract":"Microwave heating of different polymer systems (epoxy-amine. polypropylene-iron, carbon-black-filled perfiuoroelastomer) was evaluated using dielectric testing and monitored processing in a multimode microwave cavity. Dielectric measurements were made using a field perturbation technique and a transmission/reflection technique. The electric loss factor of the epoxy system continuously decreased during cure. Results for the microwave heating of the polypropylene-iron composites show that heating is enhanced with increased iron concentration and smaller iron particle size, although the penetration depth of the microwaves Is decreased, especially after the onset of percolation. A novel solidstate processing technique for thermoset systems was also evaluated. By milling the reactants to a fine powder, and mixing them completely, the extent to which diffusion limited the process was significantly reduced: increased milling resulted in higher activation energies. In addition to the inherent advantages of solid-state processing. it Is possible that processing times for solid-state processing could approach processing times for traditional melt processing.","abstract_html":"Microwave heating of different polymer systems (epoxy-amine. polypropylene-iron, carbon-black-filled perfiuoroelastomer) was evaluated using dielectric testing and monitored processing in a multimode microwave cavity. Dielectric measurements were made using a field perturbation technique and a transmission/reflection technique. The electric loss factor of the epoxy system continuously decreased during cure. Results for the microwave heating of the polypropylene-iron composites show that heating is enhanced with increased iron concentration and smaller iron particle size, although the penetration depth of the microwaves Is decreased, especially after the onset of percolation. A novel solidstate processing technique for thermoset systems was also evaluated. By milling the reactants to a fine powder, and mixing them completely, the extent to which diffusion limited the process was significantly reduced: increased milling resulted in higher activation energies. In addition to the inherent advantages of solid-state processing. it Is possible that processing times for solid-state processing could approach processing times for traditional melt processing.","abstract_has_math":false,"creators":["Ludman, John"],"institution":"Virginia Tech","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Mechanical Engineering","degree_department":"Mechanical Engineering","school":null,"contributors":[],"advisors":[],"committee_chairs":["Stern, Curtis H."],"committee_members":["Scott, Elaine P.","Thomas, William C."],"year":1994,"date_issued":"1994-03-18","date_published":"1994-03-18","updated_at":"2026-07-24T05:56:09Z","subjects":[],"languages":["en"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-06112009-063233"],"render_values":[{"text":"etd-06112009-063233","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/10919/43139","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.committeechair","label":"Committee Chair","values":["Stern, Curtis H."]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Scott, Elaine P.","Thomas, William C."]},{"key":"dc:contributor.department","label":"Department","values":["Mechanical Engineering"]},{"key":"dc:creator","label":"Author","values":["Ludman, John"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2014-03-14T21:37:54Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2014-03-14T21:37:54Z","2009-06-11"]},{"key":"dc:date.issued","label":"Date","values":["1994-03-18"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Tech"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.dcmitype","label":"Dc Type Dcmitype","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute and State University"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-06112009-063233"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/43139"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Microwave heating of different polymer systems (epoxy-amine. polypropylene-iron, carbon-black-filled perfiuoroelastomer) was evaluated using dielectric testing and monitored processing in a multimode microwave cavity. Dielectric measurements were made using a field perturbation technique and a transmission/reflection technique. The electric loss factor of the epoxy system continuously decreased during cure. Results for the microwave heating of the polypropylene-iron composites show that heating is enhanced with increased iron concentration and smaller iron particle size, although the penetration depth of the microwaves Is decreased, especially after the onset of percolation. A novel solidstate processing technique for thermoset systems was also evaluated. By milling the reactants to a fine powder, and mixing them completely, the extent to which diffusion limited the process was significantly reduced: increased milling resulted in higher activation energies. In addition to the inherent advantages of solid-state processing. it Is possible that processing times for solid-state processing could approach processing times for traditional melt processing."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["BTD"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Evaluation and design of polymer systems for enhanced microwave heating"]}]}],"canonical_facts":{"dc:contributor.committeechair":["Stern, Curtis H."],"dc:contributor.committeemember":["Scott, Elaine P.","Thomas, William C."],"dc:contributor.department":["Mechanical Engineering"],"dc:creator":["Ludman, John"],"dc:date.accessioned":["2014-03-14T21:37:54Z"],"dc:date.available":["2014-03-14T21:37:54Z","2009-06-11"],"dc:date.issued":["1994-03-18"],"dc:description.abstract":["Microwave heating of different polymer systems (epoxy-amine. polypropylene-iron, carbon-black-filled perfiuoroelastomer) was evaluated using dielectric testing and monitored processing in a multimode microwave cavity. 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