Preparation and Properties of Tannic Acid-Based Polyurethane Films with Hydrogen and Disulfide Bonds
Tannic acid was used as the cross-linking agent,castor oil as the polyol of polyurethane,isophorone diisocyanate as the polyisocyanate of polyurethane,and bis(2-hydroxyethyl) disulfide and 1,4-butanediol as the chain extender of polyurethane.Tannic acid-based polyurethanes were prepared by the pre-polymerization method,and the effects of the dosages of tannic acid and bis(2-hydroxyethyl) disulfide on the glass transition temperatures,thermal stability and self-repairing properties of polyurethanes were studied.self-repairing properties,while the biodegradation properties of tannic acid-based polyurethane films were evaluated using a lipase-based enzymatic degradation method.It was shown that an increase in the dosage of tannic acid led to an increase in the glass transition temperature of tannic acid-based polyurethane films and enhanced the thermal stability,while an increase in bis(2-hydroxyethyl)disulfide had no effect on the glass transition temperature of the films,but the thermal stability of the films was reduced;the self-healing efficiency of the STPU4 films was as high as 95% under the specific conditions (80 ℃,3 h).In addition,the mass loss of the STPU4 membrane reached 68.3% after 140 h of lipolytic digestion.
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