The effects of plasticisation on the phase behaviour in random and ABA triblock styrene-N-alkyl-4-vinylpyridinium iodide ionomers were studied using small angle X-ray scattering and dynamic mechanical techniques. It was found that the internal plasticisation of a random ionomer by quaternisation with n-iodoalkanes does not result in phase separation. The glass transition temperatures of such materials can be predicted on the basis of the vinylpyridine content and the iodoalkane chain length. Plasticisation of the random ionomers with nonpolar additives, either internally, via alkylation of the phenyl ring with 1-decene, or externally, by the addition of diethylbenzene, results in the phase separation of the material into a multiplet-containing phase and clusters. In the internally plasticised ionomers, the multiplet phase predominated at low levels of alkylation, and the cluster phase predominated when more than 20 mole % of the styrene had been alkylated. The cluster phase was always dominant in the externally plasticised ionomers. ABA triblocks of styrene (B) and vinylpyridine (A) are phase separated even in the nonionic state. Quaternisation of the end blocks yielded ionomers whose domains exhibited different morphologies depending on the midblock, end block and quaternising chain lengths, even though they had the same sample history. It was found that the styrene matrix T$ sb{ rm g}$ in the quaternised materials was depressed relative to a comparable styrene homopolymer; this reduction was attributed to inefficient packing of the styrene chains around the vinylpyridinium domains. Plasticisation of the ABA ionomers with diethylbenzene reduced the glass transition temperature of the styrene matrix, but did not affect the ionic phase. Plasticisation of the ionic regions with glycerol resulted in the depression of the vinylpyridinium T$ sb{ rm g}$, but did not appear to affect the nonpolar matrix.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.74246 |
| Date | January 1989 |
| Creators | Wollmann, Daphne |
| 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: 000969504, proquestno: AAINL57307, Theses scanned by UMI/ProQuest. |
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