{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/19937"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/19937","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The rheo-optics of shear thickening and structure formation in polymer solutions","abstract":"Simultaneous measurements of the optical and rheological response of solutions of polystyrene have been made, in-situ, in order to ascertain the connection between structure formation and the phenomenon of shear-thickening. Transient and steady state measurements of the viscosity, dichroism, birefringence and associated orientation angles were carried out in decalin and bromobenzene in the semi-dilute region using a couette device capable of shear rates up to 8,000 s$\\sp{-1}.$","abstract_html":"Simultaneous measurements of the optical and rheological response of solutions of polystyrene have been made, in-situ, in order to ascertain the connection between structure formation and the phenomenon of shear-thickening. Transient and steady state measurements of the viscosity, dichroism, birefringence and associated orientation angles were carried out in decalin and bromobenzene in the semi-dilute region using a couette device capable of shear rates up to 8,000 s$\\sp{-1}.$","abstract_has_math":true,"creators":["Kishbaugh, Alan Jay"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemical Engineering","degree_department":null,"school":null,"contributors":["McHugh, Anthony J."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:23:29Z","date_published":"2011-05-07T12:23:29Z","updated_at":"2026-07-22T22:25:15Z","subjects":["Engineering, Chemical","Physics, Optics","Plastics Technology"],"languages":["eng"],"rights":["Copyright 1992 Kishbaugh, Alan Jay"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9236505","(UMI)AAI9236505"],"render_values":[{"text":"AAI9236505","href":null,"code":true},{"text":"(UMI)AAI9236505","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/19937","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["McHugh, Anthony J."]},{"key":"dc:creator","label":"Author","values":["Kishbaugh, Alan Jay"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:23:29Z","10000-01-01","1992"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering, Chemical","Physics, Optics","Plastics Technology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1992 Kishbaugh, Alan Jay"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9236505","(UMI)AAI9236505","http://hdl.handle.net/2142/19937"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Simultaneous measurements of the optical and rheological response of solutions of polystyrene have been made, in-situ, in order to ascertain the connection between structure formation and the phenomenon of shear-thickening. Transient and steady state measurements of the viscosity, dichroism, birefringence and associated orientation angles were carried out in decalin and bromobenzene in the semi-dilute region using a couette device capable of shear rates up to 8,000 s$\\sp{-1}.$","Light scattering calculations using the Anomalous Diffraction Approximation (ADA) for large particles, the Rayleigh approximation for isotropic, uniaxial spheroids and the flexible macromolecule model, provide a phenomenologically consistent explanation for the observed behavior. A one-to-one correlation was found between the occurrence of maxima in dichroism and minima in viscosity which demonstrates that shear-thickening is caused by structure formation in solution. Kinetics of the formation of the structures in solution are instantaneous and completely reversible. For solutions that exhibited shear-thinning no maximum in dichroism was seen, the dichroism instead saturated at high shear rates.","Calculations using the ADA suggest that shear-thickening and the associated dichroism behavior result from the flow-induced production and growth of spheroidal, micron-size particles in solution. These particles are isotropic (i.e. liquid-like) and align in the flow direction. In the case of shear-thinning solutions, the Rayleigh approximation for sub-micron, isotropic spheroids was successfully used to account for the magnitude of the saturating dichroism behavior, suggesting that groups of entangled polymer chains may be forming in the solutions which give rise to the optical behavior.","Thus, the size of the particles that form in solution upon imposition of flow determines whether shear-thickening will occur. For particles which remain sub-micron over the entire shear rate range, the solution exhibits shear-thinning. If the particles continue to grow, eventually becoming a few microns in size, the solution exhibits shear-thickening. On the other hand, the birefringence was found to be dominated by the chains or entanglements still present in the dissolved state. This behavior could be modeled on the basis of the elastic dumbell theory, suitably modified to include both macroform and microform optical anisotropies.","Made available in DSpace on 2011-05-07T12:23:29Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9236505.pdf: 6721912 bytes, checksum: 2092c7153df22b294c4df3898856c23e (MD5) Previous issue date: 1992","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:40:27Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:17:19-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["The rheo-optics of shear thickening and structure formation in polymer solutions"]}]}],"canonical_facts":{"dc:contributor":["McHugh, Anthony J."],"dc:creator":["Kishbaugh, Alan Jay"],"dc:date":["2011-05-07T12:23:29Z","10000-01-01","1992"],"dc:description":["Simultaneous measurements of the optical and rheological response of solutions of polystyrene have been made, in-situ, in order to ascertain the connection between structure formation and the phenomenon of shear-thickening. Transient and steady state measurements of the viscosity, dichroism, birefringence and associated orientation angles were carried out in decalin and bromobenzene in the semi-dilute region using a couette device capable of shear rates up to 8,000 s$\\sp{-1}.$","Light scattering calculations using the Anomalous Diffraction Approximation (ADA) for large particles, the Rayleigh approximation for isotropic, uniaxial spheroids and the flexible macromolecule model, provide a phenomenologically consistent explanation for the observed behavior. A one-to-one correlation was found between the occurrence of maxima in dichroism and minima in viscosity which demonstrates that shear-thickening is caused by structure formation in solution. Kinetics of the formation of the structures in solution are instantaneous and completely reversible. For solutions that exhibited shear-thinning no maximum in dichroism was seen, the dichroism instead saturated at high shear rates.","Calculations using the ADA suggest that shear-thickening and the associated dichroism behavior result from the flow-induced production and growth of spheroidal, micron-size particles in solution. These particles are isotropic (i.e. liquid-like) and align in the flow direction. In the case of shear-thinning solutions, the Rayleigh approximation for sub-micron, isotropic spheroids was successfully used to account for the magnitude of the saturating dichroism behavior, suggesting that groups of entangled polymer chains may be forming in the solutions which give rise to the optical behavior.","Thus, the size of the particles that form in solution upon imposition of flow determines whether shear-thickening will occur. For particles which remain sub-micron over the entire shear rate range, the solution exhibits shear-thinning. If the particles continue to grow, eventually becoming a few microns in size, the solution exhibits shear-thickening. On the other hand, the birefringence was found to be dominated by the chains or entanglements still present in the dissolved state. This behavior could be modeled on the basis of the elastic dumbell theory, suitably modified to include both macroform and microform optical anisotropies.","Made available in DSpace on 2011-05-07T12:23:29Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9236505.pdf: 6721912 bytes, checksum: 2092c7153df22b294c4df3898856c23e (MD5) Previous issue date: 1992","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:40:27Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:17:19-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9236505","(UMI)AAI9236505","http://hdl.handle.net/2142/19937"],"dc:language":["eng"],"dc:rights":["Copyright 1992 Kishbaugh, Alan Jay"],"dc:subject":["Engineering, Chemical","Physics, Optics","Plastics Technology"],"dc:title":["The rheo-optics of shear thickening and structure formation in polymer solutions"],"dc:type":["text"],"thesis:degree_discipline":["Chemical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:15Z"}