Mechanically Robust, Self-Healable, and Highly Stretchable "Living" Crosslinked Polyurethane Based on a Reversible CC Bond
Mechanically Robust, Self-Healable, and Highly Stretchable "Living" Crosslinked Polyurethane Based on a Reversible CC Bond
复制标题
基于可逆 CC 键的机械坚固、可自修复且高度可拉伸的“活性”交联聚氨酯
DOI：
10.1002/adfm.201706050
复制
发表时间：
2018
影响因子：
19
通讯作者：
Zhang Ming Qiu
中科院分区：
文献类型：
--
作者：
Zhang Ze Ping;Rong Min Zhi;Zhang Ming Qiu
由可逆共价键构建的刺激响应性聚合物具有不平衡的机械性能。合成了一种新型的可逆C--C键提供者--芳香族片呐醇的交联型聚氨酯，由于片呐醇的C--C键具有较高的键能以及硬段和半晶软段之间的氢键，其拉伸强度和破坏应变分别在27.3~115.2 MPa和324%~1501%之间可调。此外，频那醇的动态平衡使聚合物能够自我修复和循环使用。有趣的是，大分子之间的动态交换首次成功地与应用于热塑性塑料的固态拉伸相配合，实现了热固性的增强。同时，频那醇均解产生的自由基可以反复引发乙烯基单体的聚合。这项工作的丰硕成果可能会创造出一系列有前途的新技术。
Stimuli‐responsive polymers built by reversible covalent bonds used to possess unbalanced mechanical properties. Here, a crosslinked polyurethane containing aromatic pinacol as a novel reversible CC bond provider is synthesized, whose tensile strength and failure strain are tunable from 27.3 MPa to as high as 115.2 MPa and from 324% to 1501%, respectively, owing to the relatively high bond energy of the CC bond of pinacol as well as the hydrogen bond between hard segments and semicrystalline soft segments. Moreover, the dynamic equilibrium of pinacol enables self‐healing and recycling of the polymer. Interestingly, the dynamic exchange among macromolecules, for the first time, successfully cooperates with solid‐state drawing that applies to thermoplastics, realizing strengthening of thermoset. Meanwhile, the radicals derived from homolysis of pinacol can repeatedly initiate polymerization of vinyl monomers. The fruitful outcomes of this work may create a series of promising new techniques.