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Facile Fabrication of Polyvinyl Alcohol/Edge-Selectively Oxidized Graphene Composite Fibers

机译：聚乙烯醇/边缘选择性氧化石墨烯复合纤维的简便制备

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摘要

Graphene derivatives are effective nanofillers for the enhancement of the matrix mechanical properties; nonetheless, graphene oxide (GO), reduced GO, and exfoliated graphene all present distinct advantages and disadvantages. In this study, polyvinyl alcohol (PVA) composite fibers have been prepared using a recently reported graphene derivative, i.e., edge-selectively oxidized graphene (EOG). The PVA/EOG composite fibers were simply fabricated via conventional wet-spinning methods; thus, they can be produced at the commercial level. X-ray diffractometry, scanning electron microscopy, and two-dimensional wide-angle X-ray scattering analyses were conducted to evaluate the EOG dispersibility and alignment in the PVA matrix. The tensile strength of the PVA/EOG composite fibers was 631.4 MPa at an EOG concentration of 0.3 wt %, which is 31.4% higher compared with PVA-only fibers (480.6 MPa); compared with PVA composite fibers made with GO, which is the most famous water-dispersible graphene derivative, the proposed PVA/EOG ones exhibited about 10% higher tensile strength. Therefore, EOG can be considered an effective nanofiller to enhance the strength of PVA fibers without additional thermal or chemical reduction processes.
机译：石墨烯衍生物是增强基质机械性能的有效纳米填料。但是，氧化石墨烯（GO），还原的GO和剥落的石墨烯都具有明显的优缺点。在这项研究中，使用最近报道的石墨烯衍生物，即边缘选择性氧化石墨烯（EOG），制备了聚乙烯醇（PVA）复合纤维。 PVA / EOG复合纤维是通过传统的湿纺方法简单地制造的。因此，它们可以在商业水平上生产。进行了X射线衍射，扫描电子显微镜和二维广角X射线散射分析，以评估EOG在PVA基质中的分散性和排列。在EOG浓度为0.3 wt％的情况下，PVA / EOG复合纤维的拉伸强度为631.4 MPa，比纯PVA纤维（480.6 MPa）高31.4％；与最著名的水分散性石墨烯衍生物GO制成的PVA复合纤维相比，所提出的PVA / EOG纤维具有更高的拉伸强度约10％。因此，EOG可被认为是无需额外的热还原或化学还原过程即可增强PVA纤维强度的有效纳米填料。

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