Poly(ether imide)s from Diamines with Para-, Meta-, and Ortho-Arylene Substitutions: Synthesis, Characterization, and Liquid Crystalline Properties
| Autor: | Theo J. Dingemans, Terry L. StClair, Eduardo Mendes, Erik S. Weiser, Jeffrey J. Hinkley |
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| Rok vydání: | 2008 |
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| Zdroj: | Macromolecules. 41:2474-2483 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | We have synthesized homologous series of para-, meta-, and ortho-substituted aryl ether diamine monomers, with either 2, 3, or 4 ether linkages per monomer unit, and prepared their corresponding poly(ether imide)s with 3,3′,4,4′-biphenyl dianhydride (BPDA) and 3,3′,4,4′-oxydiphthalic dianhydride (ODPA). All polymers were obtained in high molecular weights and gave good quality films with expected mechanical and thermal properties. The ortho- and meta-substituted diamines gave fully amorphous polymers, whereas the para-based diamines resulted in semicrystalline polymers. The glass-transition temperatures (Tg) drop in the order of para > ortho > meta, and the Tg drops considerably as a function of the aryl ether content and appears to level off at four ether linkages. The Tg values of our polymers were contrasted with a simple quantitative model and found to be in good agreement with the experimental results (±10 °C). BPDA in combination with an all para-substituted, aryl ether-based diamine (BPDA-P3) forms... |
| Databáze: | OpenAIRE |
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