Artículos de revistas
Chemorheology and ultimate behavior of epoxy-amine mixtures modified with a liquid oligomer
Fecha
2000-05Registro en:
Aizpurua, B.; Franco, M.; Corcuera, M. A.; Riccardi, Carmen Cristina; Mondragon, I.; Chemorheology and ultimate behavior of epoxy-amine mixtures modified with a liquid oligomer; John Wiley & Sons Inc; Journal of Applied Polymer Science; 76; 8; 5-2000; 1269-1279
0021-8995
CONICET Digital
CONICET
Autor
Aizpurua, B.
Franco, M.
Corcuera, M. A.
Riccardi, Carmen Cristina
Mondragon, I.
Resumen
Rubber toughening of epoxy resins has been actively studied since the 1960s with clear progress in understanding of the ultimate properties: microstructure relationships. The morphology, obtained after curing of the modified thermosetting matrix, is a function of the process conditions as well as of the materials used because both influence the thermodynamics and the kinetics of phase separation. In this work several amounts of poly(oxypropylentriamine) (POPTA), have been added as modifier to a diglycidyl ether of bisphenol-A (DGEBA)-based epoxy matrix cured with a cycloaliphatic amine. Molecular weight of the neat resin and amine/epoxy stoichiometric ratio have also been used as variables. This investigation has focused upon the importance of cure chemorheology for microstructure formation by using both physicochemical (isothermal and dynamic calorimetry) and rheological techniques. In the second part of this study, the influence of the molecular weight of the epoxy resin in the ultimate properties of 15 wt % POPTA-modified epoxy matrices is also analyzed.