This review describes the interaction of epoxy coatings with water, the kinetics of water uptake in epoxy resins, and the methods of studying the latter (gravimetric, IR (Infrared) and NMR (Nuclear magnetic resonance) spectroscopies). The analysis of experimental data requires using mathematical models which simulate the processes that occur during water uptake in a polymer matrix. This review classifies the numerous models applied for the study of water absorption into two large groups: Fickian and non-Fickian models. Fickian models involve the Fickian diffusion model and its development for the case of anomalous diffusion, as well as the models of Jacobs–Jones, Berens–Hopfenberg, and the time-varying diffusion coefficient model. The Carter–Kibler approach is provided as an example of a non-Fickian or Langmuir-type model. A critical analysis of the experimental methods is provided, including advantages and possible experimental errors. The methods used for processing experimental data are discussed as well as the effect of water on the exploitation properties and life cycle of epoxy coatings.

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 Šesták–Berggren model is well suited for describing the cure kinetics of the studied epoxyurethane compositions.

1. The rapid development of robotics and sensors connected to the human body increases the need in soft smart materials capable for self-repairing without intervention of service personal because i...