{"id":{"repo_id":"unlv","oai_identifier":"oai:oasis.library.unlv.edu:rtds-1049"},"canonical_url":"https://search.dev.ndltd.org/etd/unlv/oai:oasis.library.unlv.edu:rtds-1049","repository":{"repo_id":"unlv","name":"University of Nevada - Las Vegas","base_url":"https://oasis.library.unlv.edu/do/oai/"},"display":{"title":"Measurement of the first internal mode of polystyrene in cyclohexane and toluene through dynamic light scattering","abstract":"A study of the longest internal relaxation time {dollar}\\tau\\sb1{dollar} of 8.42 {dollar}\\times{dollar} 10{dollar}\\sp6{dollar} M{dollar}\\sb{\\rm w}{dollar} macromolecular polystyrene dissolved in both toluene and cyclohexane was done through the use of photon correlation spectroscopy from scattered laser light. The data obtained (autocorrelation functions) were then analyzed by means of a multi-exponential fitting programme (Discrete) on the Cyber 830 computer and by a non-linear least squares program (NLLSQ) on an Apple IIe computer. The exponential decay constants derived from these fits were further used to obtain a value of {dollar}\\tau\\sb1{dollar} in each solvent and also to find the power relation between these decay constants and q, the magnitude of the scattering wave vector. The relaxation time {dollar}\\tau\\sb1{dollar}, together with the q dependence of the decay constant, was then compared to the predicted results from the Rouse-Zimm bead-and-spring model of polymers as well as other models and other researchers' published results. (Abstract shortened with permission of author.).","abstract_html":"A study of the longest internal relaxation time {dollar}\\tau\\sb1{dollar} of 8.42 {dollar}\\times{dollar} 10{dollar}\\sp6{dollar} M{dollar}\\sb{\\rm w}{dollar} macromolecular polystyrene dissolved in both toluene and cyclohexane was done through the use of photon correlation spectroscopy from scattered laser light. The data obtained (autocorrelation functions) were then analyzed by means of a multi-exponential fitting programme (Discrete) on the Cyber 830 computer and by a non-linear least squares program (NLLSQ) on an Apple IIe computer. The exponential decay constants derived from these fits were further used to obtain a value of {dollar}\\tau\\sb1{dollar} in each solvent and also to find the power relation between these decay constants and q, the magnitude of the scattering wave vector. The relaxation time {dollar}\\tau\\sb1{dollar}, together with the q dependence of the decay constant, was then compared to the predicted results from the Rouse-Zimm bead-and-spring model of polymers as well as other models and other researchers' published results. (Abstract shortened with permission of author.).","abstract_has_math":false,"creators":["Ellis, Albert Raymond"],"institution":"University of Nevada, Las Vegas","degree_name":"Master of Science (MS)","degree_level":"Thesis","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["James C. Selser"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1988,"date_issued":"1988-01-01T08:00:00Z","date_published":"1988-01-01T08:00:00Z","updated_at":"2026-07-24T05:23:59Z","subjects":[],"languages":["English"],"rights":["IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://oasis.library.unlv.edu/rtds/50"],"render_values":[{"text":"https://oasis.library.unlv.edu/rtds/50","href":"https://oasis.library.unlv.edu/rtds/50","code":true}]}]},"links":{"outbound_url":"https://doi.org/10.25669/9o66-5zzt","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["James C. Selser"]},{"key":"dc:creator","label":"Author","values":["Ellis, Albert Raymond"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:publisher","label":"Institution","values":["University of Nevada, Las Vegas"]},{"key":"dc:type","label":"Dc Type","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (MS)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]},{"key":"dc:rights","label":"Dc Rights","values":["IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["10.25669/9o66-5zzt","https://oasis.library.unlv.edu/rtds/50","https://oasis.library.unlv.edu/context/rtds/article/1049/viewcontent/uc.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["A study of the longest internal relaxation time {dollar}\\tau\\sb1{dollar} of 8.42 {dollar}\\times{dollar} 10{dollar}\\sp6{dollar} M{dollar}\\sb{\\rm w}{dollar} macromolecular polystyrene dissolved in both toluene and cyclohexane was done through the use of photon correlation spectroscopy from scattered laser light. The data obtained (autocorrelation functions) were then analyzed by means of a multi-exponential fitting programme (Discrete) on the Cyber 830 computer and by a non-linear least squares program (NLLSQ) on an Apple IIe computer. The exponential decay constants derived from these fits were further used to obtain a value of {dollar}\\tau\\sb1{dollar} in each solvent and also to find the power relation between these decay constants and q, the magnitude of the scattering wave vector. The relaxation time {dollar}\\tau\\sb1{dollar}, together with the q dependence of the decay constant, was then compared to the predicted results from the Rouse-Zimm bead-and-spring model of polymers as well as other models and other researchers' published results. (Abstract shortened with permission of author.)."]},{"key":"dc:format","label":"Dc Format","values":["pdf"]},{"key":"dc:title","label":"Title","values":["Measurement of the first internal mode of polystyrene in cyclohexane and toluene through dynamic light scattering"]}]}],"canonical_facts":{"dc:contributor":["James C. Selser"],"dc:creator":["Ellis, Albert Raymond"],"dc:description.abstract":["A study of the longest internal relaxation time {dollar}\\tau\\sb1{dollar} of 8.42 {dollar}\\times{dollar} 10{dollar}\\sp6{dollar} M{dollar}\\sb{\\rm w}{dollar} macromolecular polystyrene dissolved in both toluene and cyclohexane was done through the use of photon correlation spectroscopy from scattered laser light. The data obtained (autocorrelation functions) were then analyzed by means of a multi-exponential fitting programme (Discrete) on the Cyber 830 computer and by a non-linear least squares program (NLLSQ) on an Apple IIe computer. The exponential decay constants derived from these fits were further used to obtain a value of {dollar}\\tau\\sb1{dollar} in each solvent and also to find the power relation between these decay constants and q, the magnitude of the scattering wave vector. The relaxation time {dollar}\\tau\\sb1{dollar}, together with the q dependence of the decay constant, was then compared to the predicted results from the Rouse-Zimm bead-and-spring model of polymers as well as other models and other researchers' published results. (Abstract shortened with permission of author.)."],"dc:format":["pdf"],"dc:identifier":["10.25669/9o66-5zzt","https://oasis.library.unlv.edu/rtds/50","https://oasis.library.unlv.edu/context/rtds/article/1049/viewcontent/uc.pdf"],"dc:language":["English"],"dc:publisher":["University of Nevada, Las Vegas"],"dc:rights":["IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["Measurement of the first internal mode of polystyrene in cyclohexane and toluene through dynamic light scattering"],"dc:type":["Text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Science (MS)"]},"updated_at":"2026-07-24T05:23:59Z"}