基于亚胺键和二硫键的自愈合水性聚氨酯的制备及性能

以水杨醛和2,2-二氨基二苯二硫醚反应，合成了含有芳香二硫键的席夫碱，将合成的席夫碱和聚四氢呋喃醚二醇、异佛尔酮二异氰酸酯、2,2-二羟甲基丁酸和1,4-丁二醇反应，制备了席夫碱自愈合水性聚氨酯。通过1HNMR、FTIR、对合成的席夫碱和聚氨酯进行表征，结果表明合成了有芳香席夫碱和芳香二硫键的自愈合水性聚氨酯；通过划痕测试和愈合测试对聚氨酯自愈合能力进行了表征，结果表明，SWPU-2的划痕愈合效果和自愈率都是最佳，在室温下愈合12h后，SWPU-2划痕消失，室温下愈合24h后，聚氨酯的自愈率可以达到95.8%

Preparation and characterization of self-healing waterborne polyurethane based on imine and disulfide bonds

The schiff base containing aromatic disulfide bond was successfully synthesized by the reaction of salicylic aldehyde and 2, 2-diaminodiphenyl disulfide ether. The schiff base was reacted with polytetrahydrofuranediol, isophorone diisocyanate,2, 2-dihydroxymethyl butyric acid and 1, 4-butanediol. The characterization of the schiff base and polyurethane film was performed by 1HNMR and FTIR. The results showed that the self-healing waterborne polyurethane with aromatic Schiff base and aromatic disulfide bond was successfully synthesized. The self-healing ability of polyurethane was characterized by scratch test and healing test. The results showed that swPU-2 had the best scratch healing effect and self-healing rate. After 12h healing at room temperature, swPU-2 film''s scratch disappeared, and after 24h healing at room temperature, the self-healing rate of polyurethane film could reach 95.8%