Programmable and sophisticated shape-memory behaviorviatailoring spatial distribution of polymer crosslinks
Programmable and sophisticated shape-memory behaviorviatailoring spatial distribution of polymer crosslinks
复制标题
通过定制聚合物交联的空间分布实现可编程且复杂的形状记忆行为
DOI：
10.1039/d0ta05660j
复制
发表时间：
2020
影响因子：
11.9
通讯作者：
Wu Defeng
中科院分区：
文献类型：
--
作者：
Qiu Yaxin;Wanyan Qianru;Zhang Wenting;Yin Suna;Wu Defeng
增加材料响应的空间定位对于增加形状记忆聚合物 (SMP) 执行器的行为复杂性至关重要，这在很大程度上取决于 SMP 中网络的空间分布。这项研究提出了一种有趣的方法。我们使用具有不同脂肪链长度的二醇交联剂在生物质衍生的聚（L-苹果酸）（PMA）中构建网络，从而获得具有不同网络几何形状的SMP。交联遵循两步路线：酯化进行预交联，并进一步固化以获得目标样品。组合不同的预交联片段，然后进行固化，是一种对交联的空间分布进行编程并为块状 SMP 提供行为复杂性的有效方法。此外，利用所获得的SMP块体作为复合“关节”，可以制造具有逐步响应能力的多材料系统，以更好地完成一系列复杂的异步运动。这项工作丰富了将聚合物结构和宏观加工相结合的方法，以改善 SMP 中的可编程恢复和驱动。
Increasing the spatial localization of material response is crucial for increasing the behavioral complexity of shape-memory polymer (SMP) actuators, which is strongly dependent on the spatial distribution of networks in SMP. An interesting approach is proposed in this study. We used diol crosslinkers with different fatty chain lengths to construct networks in biomass-derived poly(L-malic acid) (PMA) and thus obtained SMPs with different network geometries. The crosslinking followed a two-step route: esterification for pre-crosslinks, and further curing to obtain the target sample. Combining different pre-cross-linked pieces, followed by curing then, is an effective method for programming the spatial distribution of crosslinks and providing behavioral complexity to bulk SMP. Besides, using the as-obtained SMP bulk as the compound ‘joint’, multi-material systems with step-by-step responding capacities could be fabricated to better complete a series of sophisticated and asynchronous movements. This work enriches the approaches of combining polymer architecture and macroscale processing to improve programmable recovery and actuation in SMPs.