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Rheokinetic study on catalytic curing of oligodienurethane prepolymer with glycerol under the conditions of an excess of isocyanate groups

Abstract

For the first time the results of a rheokinetic study on the interaction of an oligodienuerethane prepolymer with glycerol under excessive content of isocyanate groups [NCO/OH = 1.5 (mol/mol)] are presented. It was found that, when conversion degree х ≈ 30 %, the interaction of isocyanate and hydroxyl groups is governed by the first order equation with adiabatic self-acceleration. Then (at х > 30 %) the curing process is described by the second order equation. A specific feature of the studied interactions is that, while temperature increases to 50 ° C, the role of the curing catalysts at the final stage is played by urethane and allophanate groups.

For citations:


Novakov I.A., Pyl’Nov D.V., Nistratov A.V., Vaniev M.A., Medvedev V.P., Petrosyan E.V. Rheokinetic study on catalytic curing of oligodienurethane prepolymer with glycerol under the conditions of an excess of isocyanate groups. Fine Chemical Technologies. 2012;7(5):89-95. (In Russ.)

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ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)