自愈
氢键
材料科学
离子键合
分子间力
聚合物
韧性
极限抗拉强度
弹性体
自愈材料
化学工程
分子动力学
复合材料
化学物理
分子
化学
离子
计算化学
有机化学
医学
替代医学
病理
工程类
作者
Hao Jiang,Yan Tong,Wuting Pang,Meng Cheng,Zhihao Zhao,Tinglei He,Zhikun Wang,Chunling Li,Shuangqing Sun,Songqing Hu
标识
DOI:10.1016/j.cej.2024.151074
摘要
Self-healing polymers with microphase separation structure typically require external stimuli to achieve self-healing, and their performance often degrades. To solve these issues, we introduce tertiary amine and carboxyl groups into polymer. The intermolecular ionic interactions and H-bonds contribute to the formation of microphase separation structures, endowing polyurethane elastomers (PU-n) outstanding mechanical properties with a maximum tensile strength and toughness of 20.61 MPa and 59.02 MJ/m3, respectively. The self-healing of the prepared PU-n can be achieved at room temperature and accelerated significantly by water because hard phases can be dissociated, resulting in enhanced molecular movement. After self-healing with water, the enhanced molecular movement and further ionization of ionic groups lead to stronger H-bonds and ionic interactions, promoting more distinct microphase separation. Thus, the mechanical strength is strengthened and the self-healing efficiency can reach 104.72 %. The enhanced molecular movement and strengthened intermolecular interactions when self-healing with water can also be verified through in-depth analysis of molecular dynamics (MD) simulations of the self-healing process. Furthermore, PU-n display remarkable shape memory and can be recycled through exposure to solvents and hot water. This study provides a novel and general method for preparing materials that can self-heal with water and self-strengthen after self-healing.
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