Fabrication Of Bionic Ultraslippery Surface (SLIPS) And Its Study On Preventing Marine Microbial Fouling And Corrosion

The development of Marine science and technology is the foundation of building a maritime power,which has been elevated to an unprecedented strategic height.Emerging fields such as Marine equipment and Marine engineering are also emerging rapidly.However,the fouling and corrosion of materials in the sea have seriously hindered their development.In recent years,bionic ultra-slippery surface（SLIPS）inspired by nepenthe plant has been proved to be able to effectively inhibit the adhesion of Marine microorganisms,and the construction of SLIPS is an effective green environmental protection antifouling technology.However,the poor stability of traditional SLIPS lubricant film and harsh conditions of low surface energy modification limit its practical application.In this paper,a novel modified preparation method of SLIPS was proposed,and PU-SS with self-healing property was further constructed,and its effect on Marine microbial fouling and corrosion was studied.The specific research contents are as follows:（1）The SLIPS with inhibiting microbial fouling and corrosion properties was constructed by the modified nano-SiO₂.Vinyl silicone oil（Vi-PDMS）was grafted onto the surface of nano-SiO₂by click chemical reaction.The modified nano-SiO₂was sprayed onto the surface with a precured epoxy resin film to construct the rough micro/nano-structure.The SLIPS was finally obtained by injecting silicone oil.The results of FT-IR,XPS and EDS showed that the surface of nano-SiO₂was successfully grafted with Vi-PDMS.Using Pseudoalteromonas sp.as a model microorganism,after 14 days of static and dynamic microbial adhesion tests,the SLIPS showed an excellent microbial adhesion inhibition performance,and the adhesion inhibition rate was 98.56%and 98.69%,respectively.Electrochemical impedance spectroscopy（EIS）test results showed that the SLIPS exhibited an excellent anti-corrosion performance in the culture medium after 14 days.（2）The construction and performance study of PU-SS with self-healing and inhibition of microbial fouling and corrosion properties.Gradient polymer with special molecular chain structure（P（LA-grad-TMC））was used as soft chain segment to synthesize polyurethane material with self-healing properties（P（LA-grad-TMC）-PU）.PU-SS was prepared by encapsulating silicone lubricant in polyurethane polymer network.The successful synthesis of gradient polymer and polyurethane was verified by ¹³C NMR,¹H NMR and DSC,and the excellent self-healing performance of PU-SS was verified by 3D laser confocal microscopy at40℃（self-healing was completed within 10 minutes）.Through the stability test,it is proved that PU-SS has good slippery performance after self-healing and soaking in seawater with different salinity and p H values for 24 hours.After 14 days of simulated static and dynamic microbial adhesion tests,the adhesion inhibition rate of PU-SS reached to 99.64%and 99.65%,respectively.EIS test results showed that PU-SS still had an excellent corrosion resistance after soaking in the culture medium for 14 days.The corrosion protection mechanism of PU-SS on carbon steel and its corrosion resistance in atmospheric environment were verified by SKP.