The polymers with pH responsiveness and temperature sensitivity exhibit important applications in many fields. To endow the responsive polymers with self-healing is meaningful work, which contributes to increase their service life and reduce waste of resources significantly. In this research, a series of pH-responsive polyurethanes containing dynamic disulfide bonds and carboxylic acid functional groups were prepared by mixing polycaprolactone diol (PCL), hexamethylene diisocyanate (HDI), 2,2-dimethylolbutyric acid, and bis(2-hydroxyethyl) disulfide. The structure of the polymer was confirmed by some characterization methods such as infrared absorption spectroscopy, Raman scattering spectroscopy, X-ray diffraction, and differential scanning calorimetry. Many performances of the polymer such as the contact angle, thermal stability, mechanics, and self-healing properties can be adjusted by changing the functional units of polyurethanes. The dynamic disulfide bonds in the main chain were observed no harm to the pH response performance, instead which were beneficial to the promotion of heat resistance, tensile properties, and self-healing performance of polyurethane. The elongation at break and the tensile strength are increased by 85.3% and 54.9%, respectively. All the polyurethane exhibited considerable self-healing effects at 110°C, with the highest healing efficiency reaching 93.7%, as a result of the dissociation of hydrogen bonds and the exchange reaction of disulfide bonds.

具有pH响应性和温度敏感性的聚合物在许多领域都有重要的应用。赋予响应性聚合物自修复是一项有意义的工作，有助于延长其使用寿命并显着减少资源浪费。在本研究中，通过混合聚己内酯二醇 (PCL)、六亚甲基二异氰酸酯 (HDI)、2,2-二羟甲基丁酸和双(2-羟乙基)，制备了一系列含有动态二硫键和羧酸官能团的 pH 响应聚氨酯。二硫化物。聚合物的结构通过红外吸收光谱、拉曼散射光谱、X射线衍射、差示扫描量热等表征方法得到证实。聚合物的许多性能如接触角、热稳定性、力学、和自愈性能可以通过改变聚氨酯的功能单元来调节。观察到主链中的动态二硫键对pH响应性能没有损害，反而有利于提高聚氨酯的耐热性、拉伸性能和自愈性能。断裂伸长率和拉伸强度分别提高了 85.3% 和 54.9%。由于氢键的解离和二硫键的交换反应，所有聚氨酯在 110°C 下都表现出相当大的自愈效果，自愈效率最高可达 93.7%。反而有利于提高聚氨酯的耐热性、拉伸性能和自愈性能。断裂伸长率和拉伸强度分别提高了 85.3% 和 54.9%。由于氢键的解离和二硫键的交换反应，所有聚氨酯在 110°C 时都表现出相当大的自愈效果，自愈效率最高可达 93.7%。反而有利于提高聚氨酯的耐热性、拉伸性能和自愈性能。断裂伸长率和拉伸强度分别提高了 85.3% 和 54.9%。由于氢键的解离和二硫键的交换反应，所有聚氨酯在 110°C 下都表现出相当大的自愈效果，自愈效率最高可达 93.7%。