Abstract
A novel silicone-based poly(urea-thiourea)/tannic acid composite(PDMS-P(Ua-TUa)-TA)with excellent mechanical,self-healing and antifouling properties is developed.The multiple dynamic hydrogen bonds formed by thiourea groups,urea groups,and tannic acid(TA)molecules ensured a tough elastomer(ul-timate strength:2.47 MPa)with high stretchability(～1000％).TA molecules as partial hydrogen bond-ing cross-linking sites interacted rapidly with urea and thiourea groups before the migration of polymer chains,resulting in fast and efficient self-healing.Scratches on the film completely disappeared within 12 min,and the repair efficiency of strength was up to 98.4％within 3 h under ambient condition.Self-healing behavior was also evaluated in artificial seawater and the healing efficiency(HE)was 95.1％.Fur-thermore,TA uniformly dispersed in the polymer matrix provides good antibacterial and anti-diatom properties,as well as strong adhesion to the substrate(～2.2 MPa).Laboratory bioassays against marine bacteria adhesion(～96％,～95％and～93％reduction for P.sp.,E.coli,and S.aureus,respectively)and diatom attachment(～84％reduction)demonstrated an outstanding antifouling property of the PDMS-P(Ua-TUa)-TA.This work provides a promising pathway towards the development of high-performance silicone-based coatings for marine anti-biofouling.
维普
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