Molecular dynamic in binary mixtures and polymer blends with large difference in glass transition temperatures of the two components: A critical review
The dynamics in highly asymmetric mixtures with large difference in Tg of the two components are complex. At low values of the lower-Tg2 component only the a1-relaxation and its Tga1 were found together with a fast relaxation. Three different interpretations of the fast relaxation were given. The fi...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/327121 |
| Acceso en línea: | https://hdl.handle.net/2117/327121 https://dx.doi.org/10.1016/j.jnoncrysol.2019.119573 |
| Access Level: | acceso abierto |
| Palabra clave: | Polymers Dynamics Mixtures Polymer blends Johari-Goldstein relaxation Confinement Polímers Àrees temàtiques de la UPC::Física::Física de l'estat sòlid |
| Sumario: | The dynamics in highly asymmetric mixtures with large difference in Tg of the two components are complex. At low values of the lower-Tg2 component only the a1-relaxation and its Tga1 were found together with a fast relaxation. Three different interpretations of the fast relaxation were given. The first one interpreted the fast relaxation as the JG ß-relaxation, and the a2-relaxation is present but not resolved. The second one interpreted it as localized and noncooperative a'-relaxation of the low-Tg2 component totally confined by the frozen high-Tg1 component. The third one interpreted it also as the confined a2-relaxation, but it is liquid-like and cooperative. We review exhaustively the experimental data of many highly asymmetric mixtures and polymer blends to show unequivocally that the observed fast relaxation is the JG ß-relaxation. Notwithstanding, the confined-but-cooperative a2-relaxation exists, albeit not resolved. Experimental data are exclusively considered and objectively utilized to arrive at the conclusions. |
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