| Abstract [eng] |
The dissertation presents advanced solutions for the development of smart and sustainable epoxy coatings. For the first time, a kinetics study was conducted on the reactions of phenalkamines – bio-based amines – and traditional low-molecular-weight amines with bisphenol A resins, evaluating their thermal efficiency, degree of cross-linking, and working time. It was found that curing epoxy resins with phenalkamine-based hardeners can achieve the same or even better properties in the cured coatings compared to those using traditional low-molecular-weight amines. The effect of reactive diluents on curing, viscosity of compositions and mechanical properties of coatings was investigated. The data obtained suggest that reactive diluents can not only replace traditional solvents to reduce the viscosity of the composition but also improve the mechanical properties of the coatings. A significant achievement of the thesis is the development of a new method for the synthesis of photopolymerisation-derived polyaspartic acid ester microcapsules, which enables rapid formation of the capsule shell and achievement of a high loading of the encapsulated material, as well as an optimal microcapsule size. The process for encapsulating isophorone diisocyanate in a polyurea shell has also been improved to achieve a high encapsulated content, yield and optimum microcapsule size. The Taguchi method was used to optimize the microcapsule synthesis. A two-capsule system embedded in epoxy coatings was developed to achieve self-healing of the coatings. A formulated coating containing 5% to 15% microcapsules reduces the area of damaged coating and has the potential to extend the life of epoxy coatings. |
