Frontier Institute of Science and Technology, and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.
Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710049, China.
ACS Appl Bio Mater. 2021 Aug 16;4(8):5926-5943. doi: 10.1021/acsabm.1c00606. Epub 2021 Aug 3.
Shape-memory and self-healing polymers have been a hotspot of research in the field of smart polymers in the past decade. Under external stimulation, shape-memory and self-healing polymers can complete programed shape transformation, and they can spontaneously repair damage, thereby extending the life of the materials. In this review, we focus on the progress in polymers with shape-memory and self-healing properties in the past decade. The physical or chemical changes in the materials during the occurrence of shape memory as well as self-healing were analyzed based on the polymer molecular structure. We classified the polymers and discussed the preparation methods for shape-memory and self-healing polymers based on the dynamic interactions which can make the polymers exhibit self-healing properties including dynamic covalent bonds (DA reaction, disulfide exchange reaction, imine exchange reaction, alkoxyamine exchange reaction, and boronic acid ester exchange reaction) and dynamic noncovalent interactions (crystallization, hydrogen bonding, ionic interaction, metal coordination interaction, host-guest interactions, and hydrophobic interactions) and their corresponding triggering conditions. In addition, we discussed the advantages and the mechanism that the shape-memory property promotes self-healing in polymers, as well as the future trends in shape-memory and self-healing polymers.
在过去的十年中，形状记忆和自修复聚合物一直是智能聚合物领域的研究热点。在外部刺激下，形状记忆和自修复聚合物可以完成编程形状转换，并且可以自发地修复损伤，从而延长材料的使用寿命。在这篇综述中，我们重点介绍了过去十年中具有形状记忆和自修复性能的聚合物的进展。根据聚合物分子结构，分析了材料在发生形状记忆和自修复过程中的物理或化学变化。我们对聚合物进行了分类，并根据可以使聚合物表现出自修复性能的动态相互作用（包括动态共价键（DA 反应、二硫键交换反应、亚胺交换反应、烷氧基胺交换反应和硼酸酯交换反应）和动态非共价相互作用（结晶、氢键、离子相互作用、金属配位相互作用、主体-客体相互作用和疏水相互作用）及其相应的触发条件，讨论了形状记忆和自修复聚合物的制备方法。此外，我们还讨论了形状记忆性能促进聚合物自修复的优点和机制，以及形状记忆和自修复聚合物的未来发展趋势。
