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oai:www.ideals.illinois.edu:2142/19299 2023-07-10 col_2142_5131 col_2142_11615 com_2142_5130 com_2142_9130 com_2142_8903

McHugh, Anthony J. Tree, David Alan 2011-05-07T12:03:11Z 2011-05-07T12:03:11Z 10000-01-01 1990 A technique to study the kinetics of flow-induced crystallization of polymers in extensional flow has been developed which uses a 4-Roll Mill. The kinetics of a High Density Polyethylene were found to be well described by the Avrami treatment, indicated that the crystallization occurred by sporadic nucleation and one-dimensional growth and were a strong function of temperature and applied stress but were independent of strain history. The kinetics were found to be consistent with the Ziabicki theory for strain-induced crystallization but inconsistent with the theory of uttermost uniformity and an elevated melting point mechanism. The kinematics and stress fields of the 4-Roll Mill flow were measured independently by a tracer particle technique and an application of the Method of Isoclinics respectively allowing comparison to the predictions of several rheological equations of state. The deformation of a polymer droplet suspended in a carrier phase at low Reynolds number and high Weber number was documented. It is recommended that the 4-Roll Mill technique be used for study of other crystallizable polymer systems. Made available in DSpace on 2011-05-07T12:03:11Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9114443.pdf: 8142495 bytes, checksum: d27f3ef7209157fe9dd8d9733dc2a834 (MD5) Previous issue date: 1990 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:36:00Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:14:25-05:00 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 AAI9114443 (UMI)AAI9114443 http://hdl.handle.net/2142/19299 eng Copyright 1990 Tree, David Alan Engineering, Chemical Crystallization kinetics of polymer melts in extensional flow text Chemical and Biomolecular Engineering Chemical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.