Researchers prepared polyurethane-based microcapsules filled with bulky isophorone diisocyanate, IPDI via interfacial polymerization method in an oil-in-water emulsion and then investigated mechanical properties and self-healing ability of microcapsule-embedded polyurethane, PU, coating.

The standard salt spray test method was used to analyze the healing ability of microcapsules within the PU coatings while the crack healing properties of the PU coatings was defined using SEM micrographs.

Results revealed that increasing microcapsule content led to increased healing efficiency. The best healing and corrosion performance was achieved for the coating with 1 wt % nano-clay and 5 or 10 wt % microcapsules as a result of barrier properties of intercalated and/or exfoliated clay platelets within the coating formulation.

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Journal reference:  Progress in Organic Coatings, Volume 123, October 2018, Pages 350-361

Provided by: © 2018 Elsevier B.V.