Cure Kinetics of Epoxyurethane Compositions with Amine Hardeners of Various Nature

摘要

The synthesis is considered of epoxyurethane interpenetrating polymer networks with preliminary preparation of polyurethane chains in epoxy resin. Amine hardeners of aromatic and aliphatic nature were selected as crosslinking agents for epoxy resin. The cure kinetics of epoxyurethane systems was studied using non-isothermal differential scanning calorimetry. The total activation energy was calculated using the methods of Ozawa and Kissinger. The application of Starink's isoconversion method made it possible to find the dependence of the activation energy values on the conversion. Further analysis of the reaction kinetics using Malek method showed the autocatalytic nature of the reaction. The chosen two-parameter Sestak-Berggren model is well suited for describing the cure kinetics of the studied epoxyurethane compositions.