Multimechanism Physical Cross-Linking Results in Tough and Self-Healing Hydrogels for Various Applications,ACS Applied Polymer Materials

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Multimechanism Physical Cross-Linking Results in Tough and Self-Healing Hydrogels for Various Applications
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-06-29 , DOI: 10.1021/acsapm.0c00464
Wei Cui ₁ , Meng-han Pi ₁ , Yue-shan Li ₁ , Ling-Ying Shi ₁ , Rong Ran ₁

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Physical hydrogels are ideal candidates for functional materials and biomaterials, but their poor mechanical performance greatly restricts their applications. In this work, we develop a class of robust physical hydrogels based on multimechanism cross-linking. For this purpose, we use a hydrophobically associating (HA) hydrogel as the template, while simultaneously introducing graphene oxide (GO) and Laponite clay nanosheets into the gel system. The mutual stabilization between the two nanosheets assisted by surfactant within the HA system permits the addition of a relatively high concentration of nanosheets to enhance the hydrogel network. The resulting physical hydrogel is cross-linked by hydrophobically associating domains and two kinds of nanosheets and shows a series of desirable mechanical properties such as high strength and ductility, self-healing, and shape-memory abilities. These excellent mechanical properties, along with the versatility of both introduced nanosheets, enable various potential applications of these hydrogels, such as biosensors for the detection of body motion and reusable dye separators for wastewater treatment. Our results demonstrate a simple method to design tough physical hydrogels with various functions.

中文翻译：

韧性和自愈水凝胶在多种应用中的多机理物理交联结果

物理水凝胶是功能材料和生物材料的理想选择，但其较差的机械性能极大地限制了其应用。在这项工作中，我们开发了一类基于多机理交联的坚固的物理水凝胶。为此，我们使用疏水缔合（HA）水凝胶作为模板，同时将氧化石墨烯（GO）和Laponite粘土纳米片引入凝胶系统。HA系统内表面活性剂辅助的两个纳米片之间的相互稳定作用允许添加相对较高浓度的纳米片以增强水凝胶网络。所得的物理水凝胶通过疏水缔合域和两种纳米片交联，并显示出一系列理想的机械性能，例如高强度和延展性，自我修复和形状记忆能力。这些出色的机械性能以及所引入的两种纳米片的多功能性使这些水凝胶具有各种潜在的应用，例如用于检测人体运动的生物传感器和用于废水处理的可重复使用的染料分离器。我们的结果证明了一种设计具有各种功能的坚韧物理水凝胶的简单方法。

更新日期：2020-08-14

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