Miscibility and mechanical properties of an amine-cured epoxy resin blended with poly (ethylene oxide)

LARRAÑAGA M.; RICCARDI C.C.; MONDRAGON I.

POLYMER INTERNATIONAL

Año: 2007 vol. 56 p. 426 - 433

0959-8103

Blends composed of diamino diphenyl methane-cured bisphenol-A epoxy resin and poly(ethylene oxide) (PEO) were prepared via in situ curing reaction of epoxy in presence of PEO. The miscibility of blends before and after the curing reaction was established by thermal (differential scanning calorimetry, DSC), structural (atomic force microscopy) and dynamic mechanical analysis. Fourier transform infrared spectroscopy indicated that the OH groups developed through cure reactions interact by hydrogenbonding with PEO. After crystallinity analysis by DSC the interaction parameter was determined through the depression of the equilibrium melting temperature. Mechanical properties of miscible blends do not show significant changing however improvement of fracture toughness has been observed respect the matrix properties.