摘要
以水杨醛和2,2-二氨基二苯二硫醚为原料,合成了含有芳香二硫键的水杨醛缩2,2-二氨基二苯二硫醚双席夫碱(简称席夫碱),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,制备了一系列席夫碱自愈合水性聚氨酯(SWPU)。通过1HNMR、FTIR对合成的席夫碱和SWPU胶膜进行了表征,采用划痕自愈合测试和自愈合测试对SWPU胶膜自愈合能力进行了评价。结果表明,合成了具有芳香亚胺键和芳香二硫键的水性聚氨酯。SWPU-2(其中,希夫碱为反应单体物质的量的8.1%)胶膜的划痕自愈合效果和自愈合率最佳,室温下愈合12 h后,划痕消失;室温下愈合24 h后,愈合率可以达到95.8%。
A series of Schiff base self-healing waterborne polyurethanes(SWPU)were synthesized via reaction of aromatic disulfide bond containing salicylaldehyde 2,2-diaminodiphenyl disulfide double Schiff base(Schiff base for short),which was prepared from salicylaldehyde and 2,2-diaminodiphenyl disulfide,with polytetrahydrofuranediol,isophorone diisocyanate,2,2-dimethyl-butyric acid and 1,4-butanediol.The Schiff base and SWPU films obtained were then characterized by 1HNMR and FTIR,followed by evaluation on the self-healing ability of SWPU films by scratch self-healing and self-healing tests.The results showed that waterborne polyurethane with aromatic imine and disulfide bonds was successfully synthesized,and SWPU-2(Schiff base dosage is 8.1%of molar of reaction monomers)film exhibiting the best scratch self-healing effect and self-healing rate.The scratch on SWPU-2 disappeared after self-healing at room temperature for 12 h,while the self-healing rate could reach 95.8%after healing at room temperature for 24 h.
作者
袁野
杨建军
吴庆云
吴明元
张建安
刘久逸
YUAN Ye;YANG Jianjun;WU Qingyun;WU Mingyuan;ZHANG Jian'an;LIU Jiuyi(College of Chemistry and Chemical Engineering,Engineering Laboratory of High Performance Waterborne Polymer Materialsof Anhui Province,Anhui University,Hefei 23060l,Anhui,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2022年第12期2449-2455,2466,共8页
Fine Chemicals
基金
2020年度安徽省重大科技成果工程化研发项目(202003c08020015)。
关键词
二硫键
席夫碱
水性聚氨酯
室温
自愈合
功能材料
disulfide bonds
Schiff base
waterborne polyurethane
room temperature
self-healing
functional materials
