Data di Pubblicazione:
1998
Abstract:
Blends of a tetrafunctional epoxy resin and a thermosetting bismaleimide (BMI) resin cured
with 4,4@-diamino diphenyl sulfone were investigated. Information on the conversion of
the reactive groups upon curing was obtained by Fourier transform infrared spectroscopy.
Dynamic-mechanical tests carried out on both dry and wet samples indicated the formation
of an IPN-like structure and a considerable reduction of the plasticizing effect of the water
absorbed in the presence of BMI. Sorption measurements at 70 ¡C revealed a reduction
of the equilibrium water uptake with respect to the neat epoxy matrix, and a slight increase
of the apparent diffusion coefficient. Furthermore, the presence of BMI enhanced such
properties as the flexural elastic modulus and the compressive yield stress while reducing
slightly the fracture parameters KIc , and GIc (critical stress intensity factor and critical strain
energy release rate, respectively), as a consequence of the reduced ability of the IPN network
to be plastically deformed under loading.
with 4,4@-diamino diphenyl sulfone were investigated. Information on the conversion of
the reactive groups upon curing was obtained by Fourier transform infrared spectroscopy.
Dynamic-mechanical tests carried out on both dry and wet samples indicated the formation
of an IPN-like structure and a considerable reduction of the plasticizing effect of the water
absorbed in the presence of BMI. Sorption measurements at 70 ¡C revealed a reduction
of the equilibrium water uptake with respect to the neat epoxy matrix, and a slight increase
of the apparent diffusion coefficient. Furthermore, the presence of BMI enhanced such
properties as the flexural elastic modulus and the compressive yield stress while reducing
slightly the fracture parameters KIc , and GIc (critical stress intensity factor and critical strain
energy release rate, respectively), as a consequence of the reduced ability of the IPN network
to be plastically deformed under loading.
Tipologia CRIS:
01.01 Articolo in rivista
Elenco autori:
Russo, Pietro; Martuscelli, Ezio; Ragosta, Giuseppe; Scarinzi, Gennaro; Musto, Pellegrino
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