Abstract

This work investigates a hybrid polyester composite consisted of Curauá natural fibres and organophilic clay nanoparticles. A Taguchi method is used to identify the effects of fibre fraction (10, 20 and 30 wt%), alkaline treatment concentration (NaOH, 2.5, 5 and 10 wt%), treatment time (2, 4 and 8 h) and nanoparticle content (2.5, 5 and 10 wt%) on the mechanical behaviour of the hybrid composites under tension and three-point bending. X-ray, FTIR and microstructural analysis are performed to assess the treated and untreated fibre surfaces. The optimum combination of the process parameters for the tensile and flexural properties is: fibre content at 30 wt%, NaOH concentration at 5 wt%, treatment time at 8 h and nanoclay inclusions at 5 wt%. A mean tensile and flexural strength of 36.13 MPa and 32.55 MPa are obtained, which represents percent increases of 39.22 % and 25.43 % compared to the polyester polymer in pristine condition.

中文翻译：

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Curauá纤维和纳米粘土增强的杂化聚酯复合材料

摘要

这项工作研究了由Curauá组成的混合聚酯复合材料天然纤维和亲有机粘土纳米颗粒。Taguchi方法用于确定纤维比例（10、20和30 wt％），碱处理浓度（NaOH，2.5、5和10 wt％），处理时间（2、4和8 h）和纳米颗粒含量的影响（2.5、5和10 wt％）对混合复合材料在拉伸和三点弯曲下的力学性能的影响。进行X射线，FTIR和微结构分析以评估已处理和未处理的纤维表面。拉伸和弯曲性能的工艺参数的最佳组合是：纤维含量为30 wt％，NaOH浓度为5 wt％，处理时间为8 h，纳米粘土夹杂物为5 wt％。获得的平均抗拉强度和挠曲强度分别为36.13 MPa和32.55 MPa，分别代表增加了39.22％和25％。