ABSTRACT

The growing environmental awareness in the last few decades has driven the research and development of composites reinforced with natural fibers as an alternative to replace synthetic fiber composites. However, their hydrophilic character and surface heterogeneity may be considered a challenge to allow reliable and wide application of these materials. One way to overcome this drawback is the modification of the surface of the fiber by chemical and/or physical treatments. Among these treatments, the graphene oxide (GO) has stood out due to its amphiphilic character. In the present work, the influence of GO-treatment in piassava fiber was investigated. The interfacial adhesion between the piassava fiber, both untreated and with GO, and the epoxy resin was evaluated by pullout tests. Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy were also performed to verify the effectiveness of the GO-treatment on the piassava fiber. The fiber’s surface morphology was further investigated by scanning electron microscopy (SEM). The GO-treatment of the piassava fiber enhanced the interfacial shear strength by ∼171% more than untreated fibers. This could allow new applications of these eco-friendly composites as high-performance materials.

摘要

过去几十年日益增长的环境意识推动了天然纤维增强复合材料的研究和开发，以替代合成纤维复合材料。然而，它们的亲水特性和表面异质性可能被认为是允许这些材料可靠和广泛应用的挑战。克服这一缺点的一种方法是通过化学和/或物理处理对纤维表面进行改性。在这些处理中，氧化石墨烯 (GO) 由于其两亲性而脱颖而出。在目前的工作中，研究了 GO 处理对木薯纤维的影响。通过拔出试验评估了未经处理和使用 GO 的木薯纤维与环氧树脂之间的界面粘合力。还进行了傅里叶变换红外光谱 (FTIR) 和拉曼光谱，以验证 GO 处理对木薯纤维的有效性。通过扫描电子显微镜 (SEM) 进一步研究了纤维的表面形态。木薯纤维的 GO 处理使界面剪切强度比未处理的纤维提高了约 171%。这可以允许这些环保复合材料作为高性能材料的新应用。