Título:
|
Thermal curing of an epoxy-anhydride system modified with hyperbranched poly(ethylene imine)s with different terminal groups
|
Autor/a:
|
Morancho Llena, José María; Fernández Francos, Xavier; Acebo Gorostiza, Cristina; Ramis Juan, Xavier; Salla Tarragó, José María; Serra Albet, Àngels
|
Otros autores:
|
Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics; Universitat Politècnica de Catalunya. POLTEPO - Polímers Termoestables Epoxídics |
Abstract:
|
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 S ¿ esta´k–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. |
Materia(s):
|
-Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers -Polymers -Nuclear magnetic resonance -Epoxy networks -Thermal curing -Hyperbranched polymers -Kinetics -Polímers -Ressonància magnètica nuclear |
Derechos:
|
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Tipo de documento:
|
Artículo - Versión presentada Artículo |
Editor:
|
Springer
|
Compartir:
|
|