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Gelation in the cyclotrimerization of dicyanates considering substitution effects

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Summary

The cyclotrimerization of dicyanates to form polycyanurate networks has been analyzed using a pure kinetic model and a combined kinetic-recursive procedure. In both cases substitution effects were considered, i.e. the reactivity of OCN groups pertainning to clusters was assumed lower than the corresponding reactivity of the monomer groups. The gel conversion varied from 1/2 (no substitutions effects) to 2/3 (infinite substitution effects). The evolution of trimer concentration along the reaction constitutes a direct experimental evidence to decide whether the polymerization follows or not an ideal course, described by the mean-field theory.

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Authors and Affiliations

  1. Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), J.B. Justo 4302, (7600), Mar del Plata, Argentina

    R. J. J. Williams & A. Vázquez

  2. Laboratoire des Matériaux Macromoléculaires, URA CNRS no 507, Institut National des Sciences Appliquées de Lyon, 20 Av. A. Einstein, F-69621, Villeurbanne Cedex, France

    J. P. Pascault

Authors
  1. R. J. J. Williams
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  2. A. Vázquez
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  3. J. P. Pascault
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Williams, R.J.J., Vázquez, A. & Pascault, J.P. Gelation in the cyclotrimerization of dicyanates considering substitution effects. Polymer Bulletin 28, 219–225 (1992). https://doi.org/10.1007/BF00299659

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  • DOI: https://doi.org/10.1007/BF00299659

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