That some kind of network plays a central role in the rheology of high molecular weight, amorphous polymers is inferred from such phenomena as a change in the slope of the curve of viscosity versus molecular weight and the plateau in the stress relaxation curve. However, these data give no explicit information about the rates of network destruction and reformation. A new method which involves the reduction in shear rate in transient shearing flow was used to obtain such network kinetics information for three polyethylene melts at 170(DEGREES)C. / Other methods of characterization have also been used. These include steady simple shear, small amplitude oscillatory shear, large amplitude oscillatory shear and transient uniaxial extensional flow. All of the above methods involve different types of deformation in both linear and nonlinear viscoelastic regions. These data were used to test the predictive abilities of two constitutive equations inspired by network theory.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.68522 |
| Date | January 1980 |
| Creators | Tsang, William Kuen Wai. |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Chemical Engineering) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 000090110, proquestno: AAINK50580, Theses scanned by UMI/ProQuest. |
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