The colloidal properties of AS diblock copolymers, and the dynamic mechanical properties of ABA triblock copolymers of polystyrene (B) and poly(methacrylic add) or poly(sodium, methacrylate) (A) were investigated. In solvents which are selectively good for the B block, the diblock copolymers form very stable micellelike aggregates which were characterized by size-exclusion chromatography, dynamic light scattering, and viscometry. This micellar system showed no apparent dissociation-associafion equilibrium within the time scale of a few days. The hydrodynamic radii of the micelles increased with the length of both the A and B blocks. The aggregation numbers were determined primarily by the length of the A block and increased with it. For the triblock copolymers, the dynamic mechanical analyses showed the presence of two glass transition temperatures (Tg) associated with microdomains of A and of B. For the neutralised materials, the Tg of the A microdomains increased with the length of the A block. The height of the rubbery plateau located between the T g's increased with the length of the A block.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.35394 |
| Date | January 1991 |
| Creators | Desjardins, Alain |
| Contributors | Eisenberg, Adi (advisor) |
| 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 Chemistry.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001317717, proquestno: NQ44650, Theses scanned by UMI/ProQuest. |
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