Gradient supramolecular interactions and tunable mechanics in polychaete jaw inspired supramolecular interpenetrating networks
Gradient supramolecular interactions and tunable mechanics in polychaete jaw inspired supramolecular interpenetrating networks
复制标题
多毛类颚启发的超分子互穿网络中的梯度超分子相互作用和可调力学
DOI：
10.1016/j.europolymj.2019.04.015
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发表时间：
2019
影响因子：
6
通讯作者：
Chase B. Thompson, Sourave Chatterjee
中科院分区：
文献类型：
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作者：
Chase B. Thompson, Sourave Chatterjee
多毛类蠕虫展示了一个显著的颚结构，在颚的长度上，金属配体的配位梯度导致了从硬到软的机械结构的转变。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%），具有更好的力学性能，可通过空化作用进行能量耗散，从而提高材料韧性。力学行为的转变进一步归因于形态，其中相分离液滴的尺寸和这些SIPN中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局部化的控制。这些材料提供了一个框架来调解力学，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 thelength 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-in-terpenetrating networks (SIPNs). These SIPN materials exhibit improved mechanics with a lower supramolecularcontent (30 wt%), allowing for energy dissipation through cavitation to increase material toughness. The shift inmechanical behavior is further attributed to the morphology, where the size of the phase-separated droplets andnature of the continuous phase in these SIPNs contributes to the material mechanics. Furthermore, chemicalgradients are applied to these systems through exposure to a competitive ligand, offering control over the lo-calization of supramolecular interactions. These materials offer a framework to mediate mechanics whilemaintaining the ability to program gradient supramolecular interactions.