The Development And Antifouling Study Of Capsaicin Derivative Modified Coatings

Marine biofouling organisms adhering on the surfaces of submerged equipments have adverse impacts on marine industries,such as increasing of navigation resistance and energy consumption,and accelerating the corrosion of equipments.Currently,silicon-based low surface energy coatings and tin-free self-polishing coatings(SPC)are the most widely usedenvironmentally friendly antifouling coatings,however,their antifouling performances are not ideal under static condition.In this thesis,eugenol which is a capsaicin derivative is used as the antifouling unit to functionally modify the silicon-based low surface energy coatings and SPC.The main contents are as follows:In this study,eugenol methacrylate(EM)was synthesized by esterification,and then combined with hydrophilic N-vinylpyrrolidone(NVP)and 3-(methacryloyloxy)propyltriethoxysilane(TMSPMA)to prepare EM modified siloxane polymer(PEPS)via free radical polymerization.Proton nuclear magnetic resonance spectroscopy(~1H NMR)and fourier transform infrared spectroscopy(FTIR)demonstrate that the PEPS polymer is successfully synthesized.The amphiphilic coating(PDMS-PEPS)based on hydroxyl-terminated polydimethylsiloxane(HO-PDMS-OH)and PEPS polymer was prepared via chemical cross-linking method.The dynamic contact angle indicates the coating can show a hydrophilic surface within 50 s under room temperature and 50%relative humidity.The surface free energy test demonstrates the coating has low surface energy properties.Antifouling tests show the coating can inhibit more than 90%of bacteria and diatom adhesion.EM modified polyacrylate polymer(PAPS-EM)was synthesized via free radical polymerization.~1H NMR,FTIR and gel permeation chromatography(GPC)demonstrate the successful synthesis of PAPS-EM copolymer.The stiffness of all samples is 4 B-5 B,and the adhesion strength is 2 H-3 H,indicating the PAPS-EM coatings possess favorable mechanical properties.The hydrolysis test and static contact angle test indicate the hydrolysis rates of all samples are<7%,and the contact angle reduction values are<5°.The antifoulant controlled release experiment demonstates the EM group could delay the eugenol leaching rate.Laboratorial antifouling tests and marine field tests demonstrate the hydrophilic group polyvinylpyrrolidone(PVP),EM group and eugenol can effectively inhibit the adhesion of proteins,bacteria,diatom and other fouling organisms.The constructed synergistic antifouling mechanism endows the PAPS-EM coating with excellentlong-term static antifouling capabilities.