Producción CyT
Artículo
Autoría
SCHROEDER, WALTER FABIAN
;
Auad, M. L.
;
SOULE, EZEQUIEL RODOLFO
Fecha
2008
Editorial y Lugar de Edición
John Wiley & Sons Inc
Revista
POLYMER ENGINEERING AND SCIENCE,
vol. 48
(pp. 52-61)
John Wiley & Sons Inc
Resumen
Información suministrada por el agente en
SIGEVA
In this work, morphological differences over the thickness of modified vinyl-ester (VE) samples are studied. A thermodynamic analysis based in the Flory-Rehner theory is proposed to evaluate the spinodal decomposition temperature evolution during the reaction. This model takes into account changes in (styrene-co-VE) copolymer composition and binary interaction parameters with conversion. Then, from the energy and mass balance equations, temperature and conversion profiles over the thickness as ...
In this work, morphological differences over the thickness of modified vinyl-ester (VE) samples are studied. A thermodynamic analysis based in the Flory-Rehner theory is proposed to evaluate the spinodal decomposition temperature evolution during the reaction. This model takes into account changes in (styrene-co-VE) copolymer composition and binary interaction parameters with conversion. Then, from the energy and mass balance equations, temperature and conversion profiles over the thickness as a function of reaction time are calculated. Combining these profiles with the proposed thermodynamic model, spinodal decomposition conversion graphs are constructed. To verify model predictions, a synthesized VE resin was modified with 7.5 wt% of poly(butadiene-co-acrylonitrile) vinyl terminated (VTBN) elastomer and then cured in molds of 3, 7, 12, and 20 mm thickness at 80°C. Fracture surfaces were observed by scanning electron microscopy showing morphological differences over thickness, which can be explained from the results obtained from the simulation.
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Palabras Clave
Non-isothermal curingMorphologyCrosslinkingPhase separation
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