New polyisobutylene-based model ionomers
| Autor: | Robson F. Storey, Joseph P. Kennedy, Y. Mohajer, Garth L. Wilkes, Shriram Bagrodia |
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| Rok vydání: | 1982 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Strain (chemistry) Relaxation (NMR) Dispersity Ionic bonding General Chemistry Polymer Condensed Matter Physics law.invention Chemical engineering chemistry law Polymer chemistry Materials Chemistry Molar mass distribution Molecule Crystallization |
| Zdroj: | Polymer Bulletin. 8:281-285 |
| ISSN: | 1436-2449 0170-0839 |
| DOI: | 10.1007/bf00700290 |
| Popis: | t-STrain induced crystallization has been observed at 25~ in low molecular weight three-arm star polyisobutylene ionomers at elongations exceeding about 550%. The sulfonated form of the polymer was neutralized with calcium hydroxide. The number average molecular weight of the polymer was only 9,000 with a dispersity ratio of about 1.7. This molecular weight is at the edge of the critical molecular weight for entanglements. Strain induced crystallization has been reported in the literature for very high molecular weight linear po]yisobutylene. However, no such effects have been observed for linear, low molecular weight polyisobutylene and it has been stated it could not be induced. The cause for this strain induced crystallization in our materials is due to the presence of three ionic terminal groups per molecule which results in sufficient coulombic forces for maintenance of molecular orientation with strain without significant relaxation. |
| Databáze: | OpenAIRE |
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