Title Moisture absorption and mechanical degradation of polymer systems incorporated with layered double hydroxide particles /
Authors Stankevich, Stanislav ; Zeleniakiene, Daiva ; Sevcenko, Jevgenijs ; Bulderberga, Olga ; Zetkova, Katerina ; Tedim, Joao ; Aniskevich, Andrey
DOI 10.3390/polym16233388
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Is Part of Polymers.. Basel : MDPI. 2024, vol. 16, iss. 23, art. no. 3388, p. 14-22.. ISSN 2073-4360
Keywords [eng] epoxy resin ; layered double hydroxide ; mechanical degradation ; moisture absorption ; moisture concentration field ; multilayered structure
Abstract [eng] This study investigated the moisture absorption and mechanical degradation of epoxy-based polymer systems with Mg-Al/NO3 layered double hydroxide (LDH) nanoparticles content up to 5 wt%. Such systems are developed for multilayer corrosion protective coatings. A sorption model was developed to calculate the moisture concentration field in the multilayer structures using Fick’s law of diffusion. The finite-difference method was used for the numerical solution. Epoxy/LDH nanocomposites were prepared using various dispersion methods with solvents, wetting agents, and via a three-roll mill. Moisture absorption was measured under different environmental conditions, including temperatures up to 50 °C and salinity levels up to 26.3 wt% salt solution. The results showed that equilibrium moisture content increased by 50% in hot water, while it was reduced by up to two times in salt solution. The diffusion coefficient in hot water increased up to four times compared to room temperature. The numerical algorithm was validated against experimental data, accurately predicting moisture distribution over time in complex polymer systems. Mechanical tests revealed that the elastic modulus did not change after water exposure; however, the ultimate strength decreased by 10–15%, especially in specimens with 5 wt% LDH.
Published Basel : MDPI
Type Journal article
Language English
Publication date 2024
CC license CC license description