Thermoplastic‐modified epoxy resins cured with different functionalities amine mixtures: Morphology,thermal behavior,and mechanical properties |
| |
| Authors: | Miren Blanco Marta López Patricia Alvarez De Arcaya Jose Angel Ramos Galder Kortaberria Carmen Cristina Riccardi Iñaki Mondragon |
| |
| Affiliation: | 1. “Materials + Technologies” Group. Dpto. Ingeniería Química y Medio Ambiente, Escuela Politécnica, Universidad País Vasco/Euskal Herriko Unibertsitatea, Donostia/San Sebastián, Spain;2. Institute of Materials Science and Technology (INTEMA), University of Mar de Plata and National Research Council (CONICET), Mar de Plata, Argentina |
| |
| Abstract: | Epoxy matrices inherent brittleness and poor crack resistance make necessary some form of toughening. In this work, to improve their fracture toughness and ductility epoxy matrices were modified by changing its architecture and by the addition of a third component. The matrices architecture were modified by stoichiometrically reacting a bifunctional epoxy resin with different functionalities amine mixtures, one of which being a monoamine that plays the role of chain extender. In the modification by the addition of a third component, poly(methyl methacrylate) (PMMA) was selected as modifier. PMMA is initially miscible with epoxy/amine systems but can phase separate during curing. The kinetics and miscibility of these systems were studied previously. At constant curing conditions, materials from completely opaque (phase separated) to transparent (miscible) can be obtained with the increase in monoamine content. In this work, the effects of the modifier content and of the monoamine : diamine ratio in stoichiometric epoxy/amine mixtures on the resultant morphologies as well as on their thermal and mechanical properties was studied.© 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 |
| |
| Keywords: | thermosets reaction‐induced phase separation functionality mechanical properties structure‐property relations |
|
|
