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Título: | Effect of hydrogen bonding on the physicochemical and rheological features of chemically modified phenoxy |
Autor: | Sangroniz, L.; Sangroniz, A.; Alegría, Ángel CSIC ORCID ; Fernández, M.; Irusta, L.; Müller, Alejandro J.; Etxeberria, Agustín; Santamaria, Andreas | Palabras clave: | Hydrogen bonds Associative polymers Rheology |
Fecha de publicación: | 2018 | Editor: | Elsevier | Citación: | Polymer 159: 12-22 (2018) | Resumen: | Selective reduction of hydrogen bonds of a phenoxy resin gave samples particularly suitable to investigate specific interactions in associative polymers. The glass transition temperature decreased when reducing hydrogen bonds, but dielectric results indicated that α and β relaxations are rather affected by steric hindrances (bulky groups). A model accounting for the combined effect of entanglements and secondary interactions on viscosity, which can be generalised for other associative polymers, is proposed and hydrogen bonds/entanglements rate is determined. Dynamic viscoelastic results at T = 170 °C and T - T = 80 °C, showed that hydrogen bonds did not constitute a network and were weakened by temperature. The non-linear viscoelastic parameter Q decreased as the amount of hydrogen bonds was reduced. LAOS (Large Amplitude Oscillatory Shear) experiments constitute a new rheological tool to investigate associative polymers. Strain hardening in extensional flow was probed to be a consequence of the long relaxation times associated to hydrogen bonds and obtained from viscoelastic data. | URI: | http://hdl.handle.net/10261/177939 | DOI: | 10.1016/j.polymer.2018.11.002 | Identificadores: | doi: 10.1016/j.polymer.2018.11.002 issn: 0032-3861 |
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