Gradient supramolecular interactions and tunable mechanics in polychaete jaw inspired semi-interpenetrating networks
Gradient supramolecular interactions and tunable mechanics in polychaete jaw inspired semi-interpenetrating networks
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DOI：
10.1016/j.eurpolymj.2019.04.015
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发表时间：
2019-07
影响因子：
6
通讯作者：
Chase B. Thompson;S. Chatterjee;L. Korley
中科院分区：
文献类型：
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作者：
Chase B. Thompson;S. Chatterjee;L. Korley
多毛类蠕虫显示了一个显着的下巴结构，在金属配位体协调的下巴的长度梯度的结果从硬到软的力学转变。为了模拟这些梯度结构，锌配位的超分子聚合物交联成共价基质，以提供超分子半互穿网络（SIPNs）。这些SIPN材料具有更低的超分子含量（30重量%），表现出更好的力学性能，允许通过空化作用进行能量耗散，以增加材料韧性。机械行为的转变进一步归因于形态，其中这些SIPN中相分离液滴的尺寸和连续相的性质有助于材料力学。此外，通过暴露于竞争性配体，将化学梯度应用于这些系统，提供对超分子相互作用的定位的控制。这些材料提供了一个框架，以调解力学，同时保持编程梯度超分子相互作用的能力。
Polychaete worms display a remarkable jaw structure, where a gradient in metal-ligand coordination down the length of the jaw results in a shift from hard to soft mechanics. To mimic these gradient structures, a Zn-coordinated supramolecular polymer is crosslinked into a covalent matrix to afford supramolecular semi-interpenetrating networks (SIPNs). These SIPN materials exhibit improved mechanics with a lower supramolecular content (30 wt%), allowing for energy dissipation through cavitation to increase material toughness. The shift in mechanical behavior is further attributed to the morphology, where the size of the phase-separated droplets and nature of the continuous phase in these SIPNs contributes to the material mechanics. Furthermore, chemical gradients are applied to these systems through exposure to a competitive ligand, offering control over the localization of supramolecular interactions. These materials offer a framework to mediate mechanics while maintaining the ability to program gradient supramolecular interactions.