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High Performance Polymers
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Morphological Characterization and Mechanical Behavior of Poly(styrene-co-acrylonitrile)-modified Epoxy Matrices

Amaya Jimeno

Galder Kortaberria

Maider Larrañaga

Nagore Gabilondo

Escuela Univ. Politénica, Departamento Ingenieria Quimica y Medio Ambiente, Universidad Pais Vasco/Euskal Herriko Unibertsitatea, Donostia-San Sebastián, Spain

Inaki Mondragon

Escuela Univ. Politénica, Departamento Ingenieria Quimica y Medio Ambiente, Universidad Pais Vasco/Euskal Herriko Unibertsitatea, Donostia-San Sebastian, Spainiapmoegi{at}sc.ehu.es

The phase-separation behavior and mechanical properties-morphology relationships of a bifunctional epoxy resin cured with an aromatic diaminic hardener and modified with several quantities of poly(styrene-co-acrylonitrile) (SAN) were investigated by thermal and microscopic analysis and by other techniques. Atomic force microscopy (AFM) revealed that all cured epoxy/SAN blends presented a two-phase structure, each composition giving a different morphology. The influence of cure temperature on phase separation and gelation was studied by solvent extraction and optical microscopy (OM). Flexural and compression behavior as well as fracture toughness results are presented as a function of the amount of copolymer. The toughening effect of adding SAN is greatly dependent on morphological features of the blends. The activation volume for plastic deformation, Vs has been calculated from stress-strain compression curves for both unmodified and 10 wt% SAN-modified epoxy mixtures.

Key Words: Epoxy • modification • rheology • morphology • mechanical

High Performance Polymers, Vol. 16, No. 4, 557-568 (2004)
DOI: 10.1177/0954008304041508
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