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PMMA-modified divinylester/styrene resins: Phase diagrams and morphologies

Authors

  • Walter F. Schroeder,

    1. Department of Chemical Engineering, Institute of Research in Materials Science and Technology (INTEMA), Universidad Nacional de Mar del Plata, Mar del Plata 7600, Argentina
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  • María J. Yáñez,

    1. Regional Center of Basic and Applied Research (CRIBABB), Camino La Carrindanga Km. 7 8000, Bahía Blanca, Argentina
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  • Mirta I. Aranguren,

    1. Department of Chemical Engineering, Institute of Research in Materials Science and Technology (INTEMA), Universidad Nacional de Mar del Plata, Mar del Plata 7600, Argentina
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  • Julio Borrajo

    Corresponding author
    1. Department of Chemical Engineering, Institute of Research in Materials Science and Technology (INTEMA), Universidad Nacional de Mar del Plata, Mar del Plata 7600, Argentina
    • Department of Chemical Engineering, Institute of Research in Materials Science and Technology (INTEMA), Universidad Nacional de Mar del Plata, Mar del Plata 7600, Argentina
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Abstract

Binary and ternary experimental cloud-point curves (CPCs) for systems formulated with a low molar mass synthesized divinylester (DVE) resin, styrene (St), and poly(methyl methacrylate) (PMMA) were determined. The CPCs results were analyzed with the Flory–Huggins (F-H) thermodynamic model taking into account the polydispersity of the DVE and PMMA components, to calculate the different binary interaction parameters and their temperature dependences. The St-DVE system is miscible in all the composition range and down to the crystallization temperature of the St; therefore, the interaction parameter expression reported for a higher molar mass DVE was adapted. The interaction parameters obtained were used to calculate the phase diagrams of the St-PMMA and the DVE-PMMA binary systems and that of the St-DVE-PMMA ternary system at three different temperatures. Quasiternary phase diagrams show liquid–liquid partial miscibility of the St-PMMA and DVE-PMMA pairs. At room temperature, the St-DVE-PMMA system is miscible at all compositions. Final morphologies of PMMA-modified cured St-DVE materials were generated by polymerization-induced phase separation (PIPS) mechanism from initial homogeneous mixtures. SEM and TEM micrographs were obtained to analyze the generated final morphologies, which showed a direct correlation with the initial miscibility of the system. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 4539–4549, 2006

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