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首页> 美国卫生研究院文献>Materials >Influence of Process Parameters in Graphene Oxide Obtention on the Properties of Mechanically Strong Alginate Nanocomposites
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Influence of Process Parameters in Graphene Oxide Obtention on the Properties of Mechanically Strong Alginate Nanocomposites

机译：氧化石墨烯成膜工艺参数对机械强度藻酸盐纳米复合材料性能的影响

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摘要

Sodium alginate, a biopolymer extracted from brown algae, has shown great potential for many applications, mainly due to its remarkable biocompatibility and biodegradability. To broaden its fields of applications and improve material characteristics, the use of nanoreinforcements to prepare nanocomposites with enhanced properties, such as carbonaceous structures which could improve thermal and mechanical behavior and confer new functionalities, is being studied. In this work, graphene oxide was obtained from graphite by using modified Hummers’ method and exfoliation was assisted by sonication and centrifugation, and it was later used to prepare sodium alginate/graphene oxide nanocomposites. The effect that different variables, during preparation of graphene oxide, have on the final properties has been studied. Longer oxidation times showed higher degrees of oxidation and thus larger amount of oxygen-containing groups in the structure, whereas longer sonication times and higher centrifugation rates showed more exfoliated graphene sheets with lower sizes. The addition of graphene oxide to a biopolymeric matrix was also studied, considering the effect of processing and content of reinforcement on the material. Materials with reinforcement size-dependent properties were observed, showing nanocomposites with large flake sizes, better thermal stability, and more enhanced mechanical properties, reaching an improvement of 65.3% and 83.3% for tensile strength and Young’s modulus, respectively, for a composite containing 8 wt % of graphene oxide.
机译：海藻酸钠是一种从褐藻中提取的生物聚合物，由于其出色的生物相容性和生物降解性，因此在许多应用中均显示出巨大潜力。为了拓宽其应用领域并改善材料特性，正在研究使用纳米增强材料来制备具有增强性能的纳米复合材料，例如可以改善热性能和机械性能并赋予新功能的碳质结构。在这项工作中，通过使用改良的Hummers方法从石墨中获得氧化石墨烯，并在超声处理和离心作用下辅助剥离，然后将其用于制备藻酸钠/氧化石墨烯纳米复合材料。研究了氧化石墨烯制备过程中不同变量对最终性能的影响。较长的氧化时间显示较高的氧化度，因此结构中的含氧基团数量较多，而较长的超声处理时间和较高的离心速率则显示出较小尺寸的石墨片脱落。考虑到加工的影响和增强材料的含量，还研究了向生物聚合物基质中添加氧化石墨烯的方法。观察到具有增强材料尺寸依赖性的材料，显示出具有大鳞片尺寸，更好的热稳定性和更增强的机械性能的纳米复合材料，其中复合材料中含有8种复合材料，其抗拉强度和杨氏模量分别提高了65.3％和83.3％。氧化石墨的重量％。

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