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.

Keywords

• реокинетика
• олигодиенуретановый форполимер
• глицерин
• уравнение первого порядка с адиабатическим автоускорением
• уравнение второго порядка с эффектом автоускорения
• rheokinetics
• oligodienurethane prepolymer
• glycerol
• first order equation with adiabatic self-acceleration
• second order equation with self-acceleration effect