Water Absorption and Hydrothermal Ageing of Epoxy Adhesives Reinforced with Amino-Functionalized Graphene Oxide Nanoparticles
Polymer Degradation and Stability 2021
Olesja Starkova, Sergejs Gaidukovs, Oskars Platnieks, Anda Barkāne, Kristina Garkusina, Ēriks Pālītis, Līga Orlova

The study is focused on quantitative characterization of water absorption and hydrothermal ageing effects in a room-temperature amine cured epoxy adhesive widely used in automotive, aerospace, construction, and marine industries. Amino-functionalized graphene oxide (mGO) nanoparticles were incorporated into the epoxy (up to 1.72 wt.%) enabled cross-linking reactions and providing high interfacial adhesion, superior reinforcement efficiency and enhanced resistance to hydrothermal ageing of nanocomposites. Anomalous water absorption accompanied by progressive weight loss of samples (down to 7%) is fitted by two-stage models considering additive and coupled contribution from water diffusion and leaching of low molecular weight epoxy species. Nanocomposites are characterized by lower water diffusivity (40%) and decreased leaching effects (70%). High reinforcing efficiency of epoxy/mGO appeared in the increased glassy and rubbery storage moduli (60%), glass transition temperature (10 °C) and activation energy of glass transition (70%) compared to the neat epoxy. Hydrothermal ageing resulted in noticeable properties degradation of samples, although to a much lower extent in the case of nanocomposites. The results will contribute to the enhancement of global durability of common epoxy-based adhesives and extension of their lifetime.

Atslēgas vārdi
Amine cured epoxy, Graphene oxide nanoparticles, Non-Fickian diffusion, Leaching, modelling, FTIR, Dynamic mechanical analysis, Reinforcing efficiency, Degradation, Plasticization

Starkova, O., Gaidukovs, S., Platnieks, O., Barkāne, A., Garkusina, K., Pālītis, Ē., Grase, L. Water Absorption and Hydrothermal Ageing of Epoxy Adhesives Reinforced with Amino-Functionalized Graphene Oxide Nanoparticles. Polymer Degradation and Stability, 2021, Vol. 191, Article number 109670. ISSN 0141-3910. e-ISSN 1873-2321. Pieejams: doi:10.1016/j.polymdegradstab.2021.109670

Publikācijas valoda
English (en)
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