Kinetics of cross-linking processes of fast-curing polyurethane system

Abstract

This work focuses on the application of thermal analysis and kinetics investigations to analyze chemical processes during cross-linking of the complex fast-curing polyurethane system. Non-isothermal Differential Scanning Calorimetry (DSC) measurements were performed for both stoichiometric mixtures of polyol and isocyanate component and for mixture with large isocyanate excess. Isoconversional methods were used to calculate initial parameters for the multi-step procedure. Data were fitted according to autocatalytic Sestak-Berggren equation and activation energies and reaction orders were obtained. Those investigations led to the successful identification of three main reactions i.e. polyaddition, isocyanate deblocking and formation allophanate groups.