School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798.
ACS Appl Mater Interfaces. 2012 May;4(5):2387-94. doi: 10.1021/am300550n. Epub 2012 Apr 19.
We present a novel approach to the fabrication of advanced polymeric nanocomposites from poly(vinyl alcohol) (PVA) by incorporation of PVA-grafted graphene oxide. In this work, we have synthesized PVA-grafted graphene oxide (PVA-g-GO) for the strong interfacial adhesion of graphene oxide (GO) to the PVA matrix. It was found that the mechanical properties of PVA were greatly improved by incorporating PVA-g-GO. For example, the tensile strength and Young's modulus of the PVA nanocomposite films containing 1 wt % net GO in the PVA-g-GO significantly increased by 88 and 150%, respectively, as compared to unfilled PVA. The elongation at break was also increased by 22%, whereas the GO/PVA nanocomposite containing 1 wt % pristine GO was decreased by 15%. Therefore, the presence of the PVA-g-GO in the PVA matrix could make the PVA not only stronger but also tougher. The strong interfacial adhesion between PVA-g-GO and the PVA matrix was attributed to the good compatibility between PVA-g-GO and the matrix PVA as well as the hydrogen-bonding between them.
我们提出了一种新方法，通过将 PVA 接枝氧化石墨烯（PVA-g-GO）掺入聚（乙烯醇）（PVA）中来制造先进的聚合物纳米复合材料。在这项工作中，我们合成了 PVA-g-GO，以增强氧化石墨烯（GO）与 PVA 基质的界面附着力。结果发现，通过掺入 PVA-g-GO，PVA 的力学性能得到了显著提高。例如，与未填充的 PVA 相比，含有 1wt%净 GO 的 PVA-g-GO 纳米复合薄膜的拉伸强度和杨氏模量分别显著提高了 88%和 150%。断裂伸长率也增加了 22%，而含有 1wt%原始 GO 的 GO/PVA 纳米复合材料则降低了 15%。因此，PVA-g-GO 的存在不仅可以使 PVA 更坚固，而且可以使 PVA 更坚韧。PVA-g-GO 与 PVA 基质之间的强界面附着力归因于 PVA-g-GO 与基质 PVA 之间的良好相容性以及它们之间的氢键。
