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Título: | Glass-transition dynamics of mixtures of linear poly(vinyl methyl ether) with single-chain polymer nanoparticles: Evidence of a new type of nanocomposite materials |
Autor: | Robles-Hernández, Beatriz CSIC ORCID; González-Burgos, Marina CSIC; Pomposo, José A. CSIC ORCID; Colmenero de León, Juan CSIC ORCID; Alegría, Ángel CSIC ORCID | Palabras clave: | Nanocomposites Single-chain polymer nanoparticles Polymer blends Dielectric relaxation Glass transition |
Fecha de publicación: | 21-mar-2019 | Editor: | Multidisciplinary Digital Publishing Institute | Citación: | Polymers 11(3): 533 (2019) | Resumen: | Single-chain polymer nanoparticles (SCNPs) obtained through chain collapse by intramolecular cross-linking are attracting increasing interest as components of all-polymer nanocomposites, among other applications. We present a dielectric relaxation study on the dynamics of mixtures of poly(vinyl methyl ether) (PVME) and polystyrene (PS)-based SCNPs with various compositions. Analogous dielectric measurements on a miscible blend of PVME with the linear precursor chains of the SCNPs are taken as reference for this study. Both systems present completely different behaviors: While the blend with the linear precursor presents dynamics very similar to that reported for PVME/PS miscible blends, in the PVME/SCNP mixtures there are an appreciable amount of PVME segments that are barely affected by the presence of SCNPs, which nearly vanishes only for mixtures with high SCNP content. Interestingly, in the frame of a simple two-phase system, our findings point towards the existence of a SCNP-rich phase with a constant PVME fraction, regardless of the overall concentration of the mixture. Moreover, the dynamics of the PVME segments in this SCNP-rich phase display an extreme dynamic heterogeneity, a signature of constraint effects. | Versión del editor: | http://dx.doi.org/10.3390/polym11030533 | URI: | http://hdl.handle.net/10261/203658 | DOI: | 10.3390/polym11030533 | Identificadores: | doi: 10.3390/polym11030533 issn: 2073-4360 |
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