Self-Healing Coatings.

About

Market overview This self-healing polymer coating inhibits corrosion of metal iron substrates while extending the life of coated materials. Self-healing materials are an emerging and promising market, expected to reach a market value of $2.7 billion by 2020. The concept of self-healing materials is to enable materials to repair damage with minimum intervention. Current approaches to achieving self-healing materials are based on encapsulating self-healing agents, which is an expensive and oftentimes impractical endeavor. Clemson University researchers have developed a self-healable polymeric coating that is achieved via crosslinking sugar moieties capable of self-repair and incorporating in polyurethanes. Further, the corrosion inhibition is achieved by crosslinking materials that inhibit the formation of iron containing oxides. By using this newly developed protective coating, the life of equipment or products can be significantly extended and their environmental footprint reduced. Technical summary Clemson researchers have developed self-healable polyurethane polymeric coatings and simultaneous corrosion inhibition when applied to metal iron substrates. Self-healing is achieved via crosslinking of chitosan with polyurethane forming components. Corrosion inhibition is achieved by crosslinking of dopamine with polyurethane as terminating chain and segments that inhibits formation of Fe+3 containing oxides. By incorporating sugar moieties into polyurethanes, these materials are able to react with atmospheric CO2 in the presence of H2O, thus reforming covalent linkages capable of bridging cleaved network segments. Mechanical properties are recovered during self-repair process. These materials resemble behavior of plants during photosynthesis, but unlike plants, they don’t require photo-initiated reactions.