Design, Synthesis And Performance Study Of High-stretch Transparent Polyurethane Antifouling Material

Anti-fouling materials,with special surface wettability,were repellent to waterand oil-borne liquids and they were of broad interest for practical applications such as corrosion resistance,water resistance,anti-fogging,self-cleaning and drag reduction.However,the existing anti-fouling materials generally exhibiting lengthy preparation,high production cost,rigidity,and opacity,which rendered them unsuitable for applications as glasses,flexible electronic displays,and wearable sensors.Therefore,it was of great practical significance to prepare anti-fouling materials with high optical transparency and high intrinsic stretchability via simple methods.Since the desirable properties,such as elasticity,wear resistance,strong adhesion and oil resistance,polyurethane was widely used in coatings,fabric finishing agents,adhesives,heat insulation materials,clothing and leather.In addition,the applications of polyurethane were of particular interest because of the convenience and moderate cost of its preparation,as well as the wide adjustable range of its performances.The fluorocarbon with low surface energy could endow polymer with anti-adhesion property.Therefore,1H,1H,2H,2H-tridecafluoro-1-octanol(TFO)was selected to modify the polyurethane to prepare anti-fouling polyurethane film with high intrinsic stretchability in this study.Meanwhile,the properties of the films formed by fluorine-terminated synergistic crosslinked polyurethane network(FSCPN)and fluorine-terminated pysically crosslinked polyurethane network(FPCPN)were studied,respectively.For FSCPN,trimethylolpropane(TMP)was selected as a crosslinking agent to form branching bonds and thus undergo internal chemical(covalent)crosslinking.Meanwhile,ethylenediamine(EDA)was used as chain extender to yield multiurea linkages in the polyurethane chains,thus enhancing the hydrogen bond crosslinking of the polyurethane.The FSCPN films had excellent optical transparency,high tensile strength and large elongation at break,and exhibited anti-adhesion to water,diiodomethane,hexadecane,vegetable oil and pump oil.For FPCPN,water was used as chain extender to react with isocyanate-terminal polyurethane prepolymer to form multiurea linkages in the polyurethane chains,thereby improving the mechanical properties of polyurethane films.The FPCPN was thermoplastic polyurethane,which had solubility and low temperature meltbility,making it reprocessable and repairable.Moreover,the FPCPN films were highly transparent and repellent against water,diiodomethane,hexadecane,vegetable oil and pump oil.