Abstract: A method for preparing a comb-like polyurethane, including: 1) adding a diol to a reaction vessel, stirring, heating, vacuum dehydrating, and cooling the diol; adding a diisocyanate to the diol, and pre-polymerizing the diisocyanate and the diol under vacuum to yield a polyurethane prepolymer; 2) dissolving lysine in a mixture of water and an organic solvent to yield a first solution, adding the first solution to the polyurethane prepolymer to yield a first reaction mixture; stopping stirring and allowing the first reaction mixture to stand for between 10 and 12 hrs, pouring the first reaction mixture into water, and drying a precipitate to yield a polyurethane elastomer containing carboxyl groups; 3) dissolving the polyurethane elastomer in an organic solvent to yield a second solution; adding an epoxy-terminated polyethylene glycol to the second solution, and stirring a resulting mixture at between 110 and 130° C.

Abstract: A method for preparing a comb-like polyurethane, including: 1) adding a diol to a reaction vessel, stirring, heating, vacuum dehydrating, and cooling the diol; adding a diisocyanate to the diol, and pre-polymerizing the diisocyanate and the diol under vacuum to yield a polyurethane prepolymer; 2) dissolving lysine in a mixture of water and an organic solvent to yield a first solution, adding the first solution to the polyurethane prepolymer to yield a first reaction mixture; stopping stirring and allowing the first reaction mixture to stand for between 10 and 12 hrs, pouring the first reaction mixture into water, and drying a precipitate to yield a polyurethane elastomer containing carboxyl groups; 3) dissolving the polyurethane elastomer in an organic solvent to yield a second solution; adding an epoxy-terminated polyethylene glycol to the second solution, and stirring a resulting mixture at between 110 and 130° C.