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Curing and characterization of oxazolidone-isocyanurate-ether networks

Authors

  • Marjorie Flores,

    1. Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, Marcel·lí Domingo s/n, 43007 Tarragona, Spain
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  • Xavier Fernández-Francos,

    1. Departament de Màquines i Motors Tèrmics, Laboratori de Termodinàmica, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain
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  • Josep M. Morancho,

    1. Departament de Màquines i Motors Tèrmics, Laboratori de Termodinàmica, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain
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  • Àngels Serra,

    1. Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, Marcel·lí Domingo s/n, 43007 Tarragona, Spain
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  • Xavier Ramis

    Corresponding author
    1. Departament de Màquines i Motors Tèrmics, Laboratori de Termodinàmica, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain
    • Departament de Màquines i Motors Tèrmics, Laboratori de Termodinàmica, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain
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Abstract

Oxazolidone-isocyanurate-ether networks were prepared by copolymerization of mixtures of DGEBA and toluene-2,4-diisocyanate (TDI) in presence of benzyldimethylamine (BDMA) as catalyst. Changes during curing and final properties of the cured materials were investigated by using DSC, FTIR/ATR, TMA, DMTA, TGA, and densitometry. The influence of the molar ratio of isocyanate to epoxide groups on the properties and curing were studied. The kinetics of curing was analyzed by means of an integral isoconversional nonisothermal procedure. The fractions of oxazolidone, isocyanurate, and ether groups present in the final network were evaluated and were found to be dependent on the initial isocyanate/epoxy ratio and curing conditions. By increasing the initial proportion of isocyanate the glass transition temperature, the thermal stability, the shrinkage, and the amount of isocyanurate rings increase, whereas the fraction of ether linkages and oxazolidones decreases. It was observed that the gelation is controlled by the formation of isocyanurate rings at the beginning of the curing. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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