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Friday, February 21 • 8:30am - 9:00am
Blending Hydrogel Particles into Various Anti-Corrosive Coatings for Water Mitigation and Performance Property Retention During Environmental Exposure - USM

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Coatings protect metal substrates through a variety of processes depending on material type(s), exposure time, and environmental severity, specifically water, oxygen, and electrolytes.  Most coating systems resort to designing torturous pathways within coatings or developing different levels of hydrophobicity to detour water; however, regardless of the polymer, they are not completely impermeable to these corrosion-supporting elements.  Therefore, understanding the mechanism of water equilibrium and saturation location in relation to the polymeric material choices requires innovative research tools and new understandings of how polymer variables affect the subtleties of water management.  Literature speculates that localized hydrophilic addition in polymer-based water management films provides a means to force disruptions in traditional water management by directing the spatial location contribution.  The hydrogel particles facilitate distinct domains with concentrated ionic content, hydration particle diameter, and provide specific locations for the collection of water which perturbs the performance properties.
Hydrogel particles were incorporated into three resin systems, specifically a phenoxy, polyurethane, and commercial epoxy-amine, to understand how hydrophilicity changes the performance properties. The hydrogels were blended at 1 wt% on solids for all coatings and characterized by measuring diffusion patterns, resulting changes in modulus and internal stress, and corrosion analysis. Despite the chemistry of the coatings, networks with hydrogel particles had a 10% by weight higher bulk saturations than their control counterparts. However, this increase in saturation was not detected at the substrate-coating interface with ATR-FTIR spectroscopy, where for example, the phenoxy system exhibited 48% less water at the interface when exposed to deionized water in the presence of hydrogel particles. Mechanical adhesion was also increased by blending hydrogel particles into the resins and is suspected to retain adhesion when exposed to environmental conditions. Continued investigation of property retention included internal stress, cyclic adhesion and void formation, and positron annihilation lifetime spectroscopy.

avatar for Jessica Davison

Jessica Davison

Graduate Student, University of Southern Mississippi
BiographyJessica Davison is a Ph.D. candidate at the University of Southern Mississippi, in the School of Polymers and High Performance Materials. Her research focuses on the mitigation of corrosion and water management utilizing nanocomposites that are comprised of hydrogel nanoparticles... Read More →

Friday February 21, 2020 8:30am - 9:00am
Rhythms II-III