Aromatic polymers obtained by precipitation polycondensation: 5*. 1H and 13C n.m.r. study of poly(ether ketone ketone)s
High molecular weight, linear aromatic poly(etherketoneketone)s with differentiso-/tere-isomer repeating unit ratio (100/0,50/50/0,0/100) have been studied by 1H and 13Cn.m.r.spectroscopy. The polymers were obtained in particle form by precipitation electrophilic Friedel–Crafts acylation condensatio...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 1997 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/79169 |
| Acceso en línea: | http://hdl.handle.net/10261/79169 |
| Access Level: | acceso abierto |
| Palabra clave: | 1H NMR 13C NMR precipitation electrophilic polycondensation |
| Sumario: | High molecular weight, linear aromatic poly(etherketoneketone)s with differentiso-/tere-isomer repeating unit ratio (100/0,50/50/0,0/100) have been studied by 1H and 13Cn.m.r.spectroscopy. The polymers were obtained in particle form by precipitation electrophilic Friedel–Crafts acylation condensation of iso-and terephthaloyclhlorideswithdiphenyl ether,1,4-and l,3-bis(4-phenoxybenzoyl) benze.ConvwentionallH and 13Cn.m.r. spectroscoy shows para-substitution in the diphenylether fragments of the mainchain. Analysis of th eexpanded 1Hn.m.r.spectra for the ring proton resonances reveals defect meta-and orthostructures. The amount and isomer ratio of these defect structures depend on the polymer structure and preparationp ath.Thelow field of 1Hn.m.r.spectra of polyketones based on ‘small monomers’(diphenylether and iso- and terephthaloylchlorides)were found to show additional minor signals corresponding to a different type of defect structure.A possible mechanism of formation of these defec tstructures is discussed. |
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