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Toward highly compressible graphene aerogels of enhanced mechanical performance with polymer

机译：朝着高度可压缩的石墨烯气凝剂，具有增强的机械性能与聚合物

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In this study, we developed a convenient way to prepare highly compressive durable graphene aerogels (GAs) with enhanced strength by combining the freeze-casting process with the binding effect of polymers. It was revealed that poly(acrylic acid) (PAA) or poly(ethylene oxide) (PEO) had no noticeable influences on the chemical reduction process of GO and the formation of the aerogel structure. However, they showed different effects on the mechanical performances of the resulting hybrid aerogels. When PAA was in the appropriate feeding content range (～30 wt%), PAA could significantly improve the strength of GAs with a 200–300% increase and simultaneously preserve their elasticity. In contrast, PEO showed a weaker reinforcing effect, and the hybrid aerogels completely lost their elasticity when the PEO feeding ratio was greater than 20 wt%. Furthermore, hybrid aerogels had slightly reduced electrical conductivity compared with that of GA. After the thorough analysis of the microstructure of hybrid aerogels ( e.g. , WAXD, XPS, Raman), we proposed that PAA chains could bridge and bind the edges of different graphene layers together, thus strengthening the network structure of hybrid aerogels. The combination of a functional polymer ( i.e. , PAA) with the freeze-casting process to prepare more mechanically robust GAs is simple, and the process is scalable and economical.
机译：在这项研究中，我们开发了一种方便的方法来制备高压压缩耐用石墨烯Aerogels（气体），通过将冷冻铸造方法与聚合物的结合效果相结合，通过将冷冻铸造方法组合来制备具有增强的强度。揭示了聚（丙烯酸）（PAA）或聚（环氧乙烷）（环氧乙烷）（PEO）对GO的化学还原过程和气凝胶结构的形成没有明显的影响。然而，它们对所得杂交气凝胶的机械性能表现出不同的影响。当PAA在适当的喂养含量范围内（〜30wt％）时，PAA可以显着提高20-300％的气体强度，同时保持弹性。相比之下，PEO显示出较弱的增强效果，当PEO进给率大于20wt％时，杂交气凝胶完全丧失它们的弹性。此外，与Ga相比，杂交气凝胶略微降低了电导率。在彻底分析混合气凝胶的微观结构之后（例如，WAXD，XPS，拉曼），我们提出了PAA链可以桥接并将不同的石墨烯层的边缘绑定在一起，从而强化混合气凝胶的网络结构。用冷冻铸造方法制备更机械稳健气体的功能性聚合物（即，PAA）的组合简单，并且该过程是可扩展且经济的。

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