聚脲
材料科学
氢键
韧性
复合材料
弹性体
极限抗拉强度
延伸率
热塑性弹性体
聚合物
热塑性聚氨酯
聚氨酯
分子
化学
有机化学
共聚物
作者
Shan Zhi-hua,Jialiang Chen,Gefei Li,Gaohua Situ,Xiaofeng Ma,Ye Sha,Dong Zhang,Qun Gu,Meng Zhang,Yanlong Luo,Zhenyang Luo
标识
DOI:10.1016/j.eurpolymj.2022.111657
摘要
It has been a challenge to impart high strength and toughness to room-temperature self-repairing polyurethane/polyurea materials. We report a room-temperature self-repairing thermoplastic polyurea elastomer (PU) with mechanical robustness. When thiosemicarbazide was used as a chain extender, strong (or weak) hydrogen bonds were formed between CO (or CS) and NH groups in the hard regions of PU. The results were optimized mechanical and self-repairing properties: the tensile strength, elongation at break, toughness, and self-repairing efficiency of the PU reached 4.43 MPa, 1498.37%, 55.14 MJ m−3, and 96.3%, respectively. We found that the increase of hard segments led to increased/decreased number of ordered/disordered hydrogen bonds, as well as enhancement of both the aggregation of hard segments and the degree of microphase separation. We proposed a model dealing with the relation between the hard segment content and the hydrogen-bonding arrays and explored the exchange rate and the order–disorder transition of hydrogen bonds, to provide an insight into the optimization of mechanical and self-repairing properties.
科研通智能强力驱动
Strongly Powered by AbleSci AI