Stretchable Self-Healing Polymeric Networks with Recyclability and Dual Responsiveness
Stretchable Self-Healing Polymeric Networks with Recyclability and Dual Responsiveness
复制标题
具有可回收性和双重响应性的可伸缩自愈聚合物网络
DOI：
10.1021/acsapm.9b01073
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发表时间：
2020-03-01
影响因子：
5
通讯作者：
Kong, Jie
中科院分区：
文献类型：
--
作者：
Dai, Xingyi;Du, Yuzhang;Kong, Jie
具有坚韧网络结构的智能聚合物对于高性能聚合物科学和技术的发展具有重要意义。在这项工作中，聚合物弹性体具有集成的可拉伸和自我愈合的特性设计通过交联超支化聚合物与柔性段。具有多个末端基团的超支化聚合物提供了各种交联点，使得可以实现机械上坚固的网络。由于亚胺键和二硫键的可逆性，该弹性体具有良好的自修复性能，在室温下的修复效率可达99%。此外，在分子水平上研究了聚合物的动态可逆性。通过A（2）+ B-3方法和Schiff碱聚合，将亚胺和二硫键引入到网络中，构建了具有pH和氧化还原响应性的可溶性和可回收的超支化聚合物。含亚胺键的聚合物完成了聚合-解聚转变，并通过改变pH值进行了多次可逆循环。此外，在二硫键的存在下，聚合物具有由二硫苏糖醇引发的氧化还原裂解性质。该研究为通过调控拓扑结构来设计和应用具有坚韧网络的智能聚合物提供了新的机遇。
Intelligent polymers with tough networks are of considerable significance for the development of highly proficient polymer science and technology. In this work, polymeric elastomers with integrated stretchable and self-healable characteristics were designed by cross-linking hyperbranched polymers with flexible segments. The hyperbranched polymer with multiple terminal groups provided various cross-linking points so that mechanically robust networks could be achieved. Driven by the reversibility of imine and disulfide bonds employed, the elastomers exhibited good self-healing property, and the healing efficiency reached up to 99% under ambient environments. Furthermore, the dynamic reversibility of the polymers was investigated at the molecular level. The imine and disulfide bonds were incorporated into the networks to construct a soluble and recyclable hyperbranched polymer with pH and redox responsiveness via an A(2) + B-3 approach and Schiff base polymerization. The polymers containing imine bonds completed the polymerization-depolymerization transition and underwent reversible cycles several times through changing pH. Moreover, in the presence of disulfide bonds, the polymers were provided with a redox cleavage property triggered by dithiothreitol. This study provides new opportunities for the design and application of intelligent polymers with tough networks through regulation of topological structures.