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A facile method to fabricate hybrid hydrogels with mechanical toughness using a novel multifunctional cross-linker

机译：一种使用新型多功能交联剂制备具有机械韧性的杂化水凝胶的简便方法

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Introducing both chemical and physical cross-links into a polymer network has emerged as a prevalent strategy to toughen hydrogels. However, most of these hybrid hydrogels are prepared in a multi-step route with more than one polymer or cross-linker, which is sophisticated and time consuming. Here, we report on a facile fabrication by in situ polymerization of acrylamide with a single multifunctional cross-linker. Compressive and tensile tests show the obtained hydrogels exhibit superior mechanical toughness. They can be stretched up to 1900% with a maximal fracture stress of nearly 500 kPa and be compressed by 90%. More impressively, the hydrogels can be fully recovered under compression. Rheological measurements suggest the co-existence of physical and chemical cross-links. Finally, an effective energy dissipation mechanism is observed and discussed. We conclude that the reversible physical cross-links originated from entanglement provide a mechanism of energy dissipation while the chemical cross-links ensure the structural integrity, which could be responsible for the improved mechanical properties.
机译：将化学和物理交联引入聚合物网络已成为增韧水凝胶的普遍策略。然而，大多数这些杂化水凝胶是用多于一种的途径用一种以上的聚合物或交联剂制备的，这是复杂且费时的。在这里，我们报道了通过具有单一多功能交联剂的丙烯酰胺的原位聚合制备的简便方法。压缩和拉伸测试表明，所获得的水凝胶显示出优异的机械韧性。它们可以被拉伸到1900％，最大断裂应力接近500 kPa，并被压缩90％。更令人印象深刻的是，水凝胶可以在压缩下完全回收​​。流变学测量表明物理和化学交联共存。最后，观察并讨论了一种有效的能量耗散机制。我们得出的结论是，源自缠结的可逆物理交联提供了一种能量耗散机制，而化学交联则确保了结构完整性，这可能是改善机械性能的原因。

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