{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/69749"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/69749","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Flow Induced Crystallization of Polyethylene Fibers From Solution","abstract":"This study deals mainly with investigating the growth sequence of a polyethylene fiber in the Poiseuille flow geometry. Features of an earlier study using the surface growth method to produce polyethylene fibers in Couette geometry are also included in the discussion. Fiber growth is initiated from a polyethylene seed inserted into a capillary tube and the growth phenomenon is observed through crossed polars. The formation of an unoriented, concentrated and amorphous phase is documented. This precursor fiber becomes crystalline through the growth of oriented crystallites and results in a gradual increase of fiber birefringence. The duration of the transformation sequence is effected by both flow rate and crystallization temperature, and decreases with the former whereas it increases with the latter. The role of trapped entanglements acting as semipermanent crosslinks is discussed and an analysis of the crystallization data is made based on the treatment given to crosslinked polymers under strain. The results obtained as such are in correct agreement with theory. Further studies are required to understand the exact nature of the precursor fiber and its formation.","abstract_html":"This study deals mainly with investigating the growth sequence of a polyethylene fiber in the Poiseuille flow geometry. Features of an earlier study using the surface growth method to produce polyethylene fibers in Couette geometry are also included in the discussion. Fiber growth is initiated from a polyethylene seed inserted into a capillary tube and the growth phenomenon is observed through crossed polars. The formation of an unoriented, concentrated and amorphous phase is documented. This precursor fiber becomes crystalline through the growth of oriented crystallites and results in a gradual increase of fiber birefringence. The duration of the transformation sequence is effected by both flow rate and crystallization temperature, and decreases with the former whereas it increases with the latter. The role of trapped entanglements acting as semipermanent crosslinks is discussed and an analysis of the crystallization data is made based on the treatment given to crosslinked polymers under strain. The results obtained as such are in correct agreement with theory. Further studies are required to understand the exact nature of the precursor fiber and its formation.","abstract_has_math":false,"creators":["Rietveld, Jeroen"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemical Engineering","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-12-15T19:54:21Z","date_published":"2014-12-15T19:54:21Z","updated_at":"2026-07-22T22:26:01Z","subjects":["Engineering, Chemical"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8502283"],"render_values":[{"text":"(UMI)AAI8502283","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/69749","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Rietveld, Jeroen"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-15T19:54:21Z","10000-01-01","1984"]},{"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"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/69749","(UMI)AAI8502283"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This study deals mainly with investigating the growth sequence of a polyethylene fiber in the Poiseuille flow geometry. Features of an earlier study using the surface growth method to produce polyethylene fibers in Couette geometry are also included in the discussion. Fiber growth is initiated from a polyethylene seed inserted into a capillary tube and the growth phenomenon is observed through crossed polars. The formation of an unoriented, concentrated and amorphous phase is documented. This precursor fiber becomes crystalline through the growth of oriented crystallites and results in a gradual increase of fiber birefringence. The duration of the transformation sequence is effected by both flow rate and crystallization temperature, and decreases with the former whereas it increases with the latter. The role of trapped entanglements acting as semipermanent crosslinks is discussed and an analysis of the crystallization data is made based on the treatment given to crosslinked polymers under strain. The results obtained as such are in correct agreement with theory. Further studies are required to understand the exact nature of the precursor fiber and its formation.","Made available in DSpace on 2014-12-15T19:54:21Z (GMT). No. of bitstreams: 1 8502283.pdf: 4509299 bytes, checksum: 05f08a0e6ec43ef3f7cf0921712378af (MD5) Previous issue date: 1984","Embargo set by: Seth Robbins for item 69915 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","165 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984."]},{"key":"dc:title","label":"Title","values":["Flow Induced Crystallization of Polyethylene Fibers From Solution"]}]}],"canonical_facts":{"dc:creator":["Rietveld, Jeroen"],"dc:date":["2014-12-15T19:54:21Z","10000-01-01","1984"],"dc:description":["This study deals mainly with investigating the growth sequence of a polyethylene fiber in the Poiseuille flow geometry. Features of an earlier study using the surface growth method to produce polyethylene fibers in Couette geometry are also included in the discussion. Fiber growth is initiated from a polyethylene seed inserted into a capillary tube and the growth phenomenon is observed through crossed polars. The formation of an unoriented, concentrated and amorphous phase is documented. This precursor fiber becomes crystalline through the growth of oriented crystallites and results in a gradual increase of fiber birefringence. The duration of the transformation sequence is effected by both flow rate and crystallization temperature, and decreases with the former whereas it increases with the latter. The role of trapped entanglements acting as semipermanent crosslinks is discussed and an analysis of the crystallization data is made based on the treatment given to crosslinked polymers under strain. The results obtained as such are in correct agreement with theory. Further studies are required to understand the exact nature of the precursor fiber and its formation.","Made available in DSpace on 2014-12-15T19:54:21Z (GMT). No. of bitstreams: 1 8502283.pdf: 4509299 bytes, checksum: 05f08a0e6ec43ef3f7cf0921712378af (MD5) Previous issue date: 1984","Embargo set by: Seth Robbins for item 69915 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","165 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984."],"dc:identifier":["http://hdl.handle.net/2142/69749","(UMI)AAI8502283"],"dc:subject":["Engineering, Chemical"],"dc:title":["Flow Induced Crystallization of Polyethylene Fibers From Solution"],"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":"2026-07-22T22:26:01Z"}