弹性体
材料科学
极限抗拉强度
聚氨酯
肖氏硬度计
聚己内酯
复合材料
韧性
聚脲
拉伸试验
溶解
二醇
聚合物
化学工程
高分子化学
工程类
作者
Chuanhui Gao,Luyang Sun,Sikai Wang,Shuting Cao,Hongzhen Liu,Picheng Chen,Yanqing Wang
摘要
Abstract Due to its comprehensive properties, polyurethane elastomer (PU) plays a vital role in ships, construction, transportation facilities, and other fields. However, it is challenging to design polyurethane elastomer materials with good mechanical properties, self‐healing ability, and degradable ability. Herein, a kind of polyurethane elastomer based on multiple hydrogen bond crosslinking was successfully synthesized by using polycaprolactone with substantial crystallization as a soft chain segment and introducing adipic dihydrazide (ADH) and U 2 ‐diol (a ureido‐pyrimidinone with two hydroxyl groups at the end) to achieve ordered hydrogen bond assembly design and control. The elastomer has good tensile strength, healability, degradability, and solubility. The maximum tensile strength and toughness of the prepared polyurethane elastomer (PUAD) were 46.34 MPa and 687.66 MJ/m 3 , respectively. With the increase of U 2 ‐diol content, the self‐repair efficiency was greatly enhanced. After seven repair cycles, the self‐repair efficiency can still reach 66.88%. In addition, the bacterial degradation test using Pseudomonas aeruginosa as a strain showed that PUAD film had excellent degradability. The dissolution test with N , N ‐dimethylformamide (DMF) as solvent showed that the tensile strength was almost unchanged after three dissolutions.
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