基于协同双硫键制备自修复水性聚氨酯
Preparation of self-healing waterborne polyurethane based on synergistic disulfide bonds
将2,2'-二氨基二苯二硫醚(2-APDS)和2-羟乙基二硫化物(HEDS)同时引入水性聚氨酯主链,制备了具有高自修复效率和优异力学性能的自修复水性聚氨酯(SWPU),对SWPU的红外光谱、拉曼光谱、粒径及Zeta电位、热稳定性、力学性能和自修复效率进行分析。分析表明,合成的SWPU都具有较好的稳定性,且随着2-APDS含量的增加,SWPU自修复效率和力学性能都呈先增大后减小的趋势,SWPU3的拉伸强度达到19.34 MPa,在65℃下2 h自修复效率达到88.97%,而随着HEDS的引入,SWPU的自修复效率进一步提高,但力学性能下降,SWPU6具有较好的自修复效率和力学性能,拉伸强度达到17.43 MPa,65℃下2 h自修复效率达到97.25%。
Self-healing waterborne polyurethane (SWPU) with efficient self-healing efficiency and excellent mechanical properties was prepared by introducing 2,2'-diaminodiphenyldisulfide (2-APDS) and 2-hydroxyethyl disulfide (HEDS) into the waterborne polyurethane backbone at the same time,and the infrared spectra,Raman spectroscopy,particle size,Zeta potential,thermal stability,mechanical properties and self-healing efficiency of SWPU were analyzed.Analysis indicates that all synthesized SWPU samples exhibit good stability.As the content of 2-APDS increases,both the self-healing efficiency and mechanical properties of SWPU initially improve and subsequently decline.The tensile strength of SWPU3 reached 19.34 MPa,and the self-healing efficiency reached 88.97% at 65℃ for 2 h,while with the introduction of HEDS,the self-healing efficiency of SWPU was further improved,but the mechanical properties decreased,and SWPU6 had better self-healing efficiency and mechanical properties.The tensile strength reached 17.43 MPa,and the self-healing efficiency reached 97.25% at 65℃ for 2 h.
双硫键 / 力学性能 / 修复效率 / 水性聚氨酯 / 氢键
disulfide bonds / mechanical properties / self-healing efficiency / waterborne polyurethane / hydrogen bonds
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