Several systems, containing up to 10 mol % ionic co-units, were investigated by dynamic mechanical techniques, primarily above the glass transition. The ionic units in quaternized poly(styrene-co-4-vinylpyridine) mildly retard chain diffusion. In contrast, the rubbery plateau of blends of poly(styrene-co-styrene-sulfonic acid) and poly(ethyl acrylate-co-4-vinylpyridine), compatible above ca. 4 mol % co-unit content, is greatly extended, independent of co-unit content. It is postulated that the kinetics of ion dissociation and reassociation in the blends are faster than chain diffusion, effectively trapping chain entanglements for comparatively long times. Time-temperature reducibility applies to both the cationic ionomers and the blends. It fails at high plasticizer contents for poly(styrene-co-sodium methacrylate), of 5 mol % ion content, plasticized by a styrene oligomer. Two relaxation processes are evident in this system. Nonpolar diluents plasticize the ionic regions of carboxylated more than sulfonated ionomers. Polar diluents destroy the effect of ionic associations in the transition and rubbery zones.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.70355 |
| Date | January 1984 |
| Creators | Bazuin, C. Geraldine. |
| 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: 000215673, proquestno: AAINN75879, Theses scanned by UMI/ProQuest. |
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