Abstract
In this paper, polyurethane (PU) with polyethylene glycol as a soft segment and isophorone diisocyanate as a hard segment were designed and synthesized. Copper complex (Cu(HD)2) was synthesized in PU preparation, bringing excellent self-healing, photothermal and antibacterial properties. The content of Cu2+ accounted for less than 2wt% of PU elastomer. Cu(HD)2 acted as a chain extender and provided coordination bonds for elastomer to promote the self-healing process. Experiments showed that Cu(HD)2 exhibited excellent photothermal properties in PU. The maximum temperature of the samples after 5 min irradiation under a sunlight simulator could reach 120 °C. The results of the self-healing experiment showed that mechanical properties of PU could be recovered by nearly 90%, and electrochemical protection performance could be recovered by nearly 100%. Antibacterial experiments proved that PU could release Cu2+, forming an antibacterial ring around PU. PU has excellent application in the field of anticorrosion and antibacterial coatings.
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