Title: Simultaneous  realization of antifouling, self-healing, and strong substrate adhesion  via a bioinspired self-stratification strategy

Abstract: Antifouling ability and substrate adhesion are typical trade-offs seen  for a silicone coating. Furthermore, the self-healable inability limits  their duration. This study reports a bioinspired self-stratifying  coating composed of a polyurethane with dopamine and silane pedant  groups and a bi-silanol-terminated poly(dimethylsiloxane) with  fluorocarbon and poly(ethylene glycol) segments as a reactive  amphiphilic polymer (RAP). During coating formation, the RAP with low  surface energy can be enriched on the surface due to the  self-stratifying effects, whereas the bioinspired dopamine and silane  groups provide the coating with strong substrate adhesion. Besides, the  multiple hydrogen bonds formed between the urethane linkages and the  dopamine groups allow the coating to heal. Our study indicates such a  polyurethane-based coating has excellent antifouling ability against  proteins, bacteria, and diatoms, good self-healing performance at room  temperature in air and water, as well as high adhesion strength on  various substrates such as ceramic, steel, glass, and wood. This study  provides a promising and universal strategy for the simultaneous  realization of antifouling, self-healing, and strong substrate adhesion.  The coatings could meet the needs of applications in marine  antifouling, biomedical instruments, and other fields.