Artículo
Thermodynamic analysis of the reaction-induced phase separation in model systems based on blends of a rubber in diepoxide/monoamine precursors
Zucchi, Ileana Alicia
; Galante, Maria Jose
; Borrajo Fernandez, Julio
; Williams, Roberto Juan Jose
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Fecha de publicación:
08/2003
Editorial:
Wiley
Revista:
Macromolecular Symposia
ISSN:
1022-1360
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The reaction-induced phase separation in blends based on a carboxyl-terminated poly(butadiene-co-acrylonitrile) rubber (CTBN), dissolved in diglycidyl ether of bisphenol A (DGEBA) - benzylamine (BA) monomers, was studied. The polymerization kinetics was followed by size exclusion chromatography, for both the neat DGEBA-BA system and for blends containing 10 wt % CTBN. No effect of CTBN addition on the polymerization rate was observed within experimental error. The kinetics could be fitted with a model based on the presence of non-catalytic and OH-catalyzed reactions and assuming equal reactivity of primary and secondary amine hydrogens. Cloud-point conversions were determined at 60, 70 and 80 °C. The Flory-Huggins model provided a reasonable fitting of experimental data using an interaction parameter depending exclusively on temperature, and taking polydispersities of both linear polymers into account. Linear epoxy/amine systems may be used to test the reliability of thermodynamic theories in more complex situations (e.g., modifiers with a broad distribution of molar masses or mixtures of several modifiers).
Palabras clave:
Cloud Point Conversion
,
Kinetics
,
Phase Separation
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Articulos(INTEMA)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Citación
Zucchi, Ileana Alicia; Galante, Maria Jose; Borrajo Fernandez, Julio; Williams, Roberto Juan Jose; Thermodynamic analysis of the reaction-induced phase separation in model systems based on blends of a rubber in diepoxide/monoamine precursors; Wiley; Macromolecular Symposia; 198; 1; 8-2003; 295-307
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