Autor según el artículo: À. Serra; J.M. Morancho; X. Fernández-Francos; C. Acebo; X. Ramis; J.M. Salla
Departamento: Química Analítica i Química Orgànica
Autor/es de la URV: SERRA ALBET, MARIA ANGELS; J.M. Morancho; X. Fernández-Francos; C. Acebo; X. Ramis; J.M. Salla
Palabras clave: Epoxy networks Kinetics hyperbranched polymers
Resumen: New hyperbranched polymers (HBP) have been synthesized by reaction of a poly(ethylene imine) with phenyl and t-butyl isocyanates. These HBPs have been characterized by 1H-NMR (nuclear magnetic resonance of hydrogen) and Fourier transform infrared spectroscopy. Their influence on the curing and properties of epoxy-anhydride thermosets has been studied by different techniques: differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and thermogravimetry (TG). The curing kinetics has been studied with DSC. Integral isoconversional method and the Šesták–Berggren model have been used to determine the activation energy and the frequency factor. The kinetic parameters are very similar for all the studied systems at the middle stage of the process, but changes are observed at the beginning and at the end of the process when these modifiers are used. The HBPs reduce the glass transition temperature of the cured materials. In addition, from the DMA analysis it can be seen that the HBP modifier obtained from phenyl isocyanate hardly changes the storage modulus, but the obtained ones from t-butyl isocyanate decrease it. TG analysis reveals a decrease in the onset temperature of the degradation process upon addition of the HBPs.
Grupo de investigación: Polimers
Áreas temáticas: Chemistry Química Química
Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 1388-6150
Identificador del autor: 0000-0003-1387-0358; 0000-0002-9416-3657; 0000-0002-3492-2922; n/a; 0000-0003-2550-7185; n/a
Fecha de alta del registro: 2016-04-14
Página final: 654
Volumen de revista: 127
Versión del articulo depositado: info:eu-repo/semantics/submittedVersion
Enlace a la fuente original: https://link.springer.com/article/10.1007/s10973-016-5376-z
URL Documento de licencia: https://repositori.urv.cat/ca/proteccio-de-dades/
DOI del artículo: 10.1007/s10973-016-5376-z
Entidad: Universitat Rovira i Virgili
Año de publicación de la revista: 2016
Página inicial: 645
Tipo de publicación: Article Artículo Article