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Kinetics of formation and properties of aliphatic polyisocyanurates: Effect of monomer functionality

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Abstract

The kinetics of isothermal cyclotrimerization of bifunctional hexamethylene diisocyanate and trifunctional isocyanurate in the presence of hexabutyldistannyl oxide as a catalyst has been studied with differential scanning calorimetry and dielectric relaxation spectroscopy. It has been demonstrated that a rise in the glass transition temperature in the course of cure of the trifunctional monomer is satisfactorily described by the equilibrium first-order kinetics. The evolution of dielectric parameters is similar for both samples but is characterized by a shift along the time scale because of different specific concentrations of isocyanate groups in the parent monomers. Given the same catalyst concentration, the trimerization of hexamethylene diisocyanate proceeds at a higher rate than that of isocyanurate. For maximally cured systems, this effect manifests itself as a small increase in the glass transition temperature and the shear modulus in the rubbery state and a change in the temperature interval of α relaxation.

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Original Russian Text © V.Yu. Kramarenko, S.M. Dudkin, I. Alig, V.P. Privalko, 2006, published in Vysokomolekulyarnye Soedineniya, Ser. A, 2006, Vol. 48, No. 11, pp. 1957–1967.

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Kramarenko, V.Y., Dudkin, S.M., Alig, I. et al. Kinetics of formation and properties of aliphatic polyisocyanurates: Effect of monomer functionality. Polym. Sci. Ser. A 48, 1147–1156 (2006). https://doi.org/10.1134/S0965545X06110034

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  • DOI: https://doi.org/10.1134/S0965545X06110034

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