The solid state morphology of block copolymers containing short ionic terminal sequence(s) was investigated using small-angle X-ray and neutron scattering (SAXS and SANS) as a function of architecture (AB, ABA), chemical composition of the ionic block(s) (vinylpyridinium, cesium methacrylate), length of the ionic and nonionic (polystyrene) blocks, extent of neutralization, and method of preparation (compression molding, solvent casting). The ionic phase-separated microdomains were found to be spherical. The radius of those spheres depends only on the length of the ionic block and not on any other of the parameters studied. The only exceptions were the molded ABA vinylpyridinium materials which were thought not to be in their equilibrium morphology due to the method of preparation. The ionic blocks seem highly extended in their microdomains. This is explained by the fact that the system is producing the biggest possible spheres in order to minimize the total interfacial energy. It was also found that the AB architecture and the preparation by solvent casting favor ordering of the microdomains. / The conformation of the polystyrene midblock in ABA vinylpyridinium materials in the solid phase was studied by SANS. The dimensions of this segment were clearly found to be identical to a homopolymer of the same molecular weight, indicating that no stretching occurs due to the presence of the two attached ionic blocks.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.41023 |
| Date | January 1992 |
| Creators | Gouin, Jean-Pierre |
| 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: 001335433, proquestno: NN87865, Theses scanned by UMI/ProQuest. |
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