The use of treatments in natural fibers is largely used, because it can improve the interfacial adhesion of polymer composites. However, the choice of the most appropriate treatment should take into account environmental factors, due to the need of new materials to meet requirements related to the concept of sustainability. This article investigated the influence of the mercerization, acetylation and gamma radiation treatments on the mechanical properties of sisal fibers, to use in composite materials. Experimental conditions were defined with different concentrations of reagents and radiation doses in order to understand the impact of these reactions on the tensile properties of sisal fibers. Thermal gravimetric analysis (TGA) and Fourier Transform Infrared (FTIR) spectroscopy were used to investigate the fiber degradation process and the chemical modifications after the treatments. The use of mercerization (0.1 M and 1.0 M NaOH concentrations) combined with acetylation increased the hydrophobic character of the sisal fiber, which may improve its interaction with polymeric matrices. In addition, mercerized sisal fiber at 0.5 M NaOH concentration, exposed to 25 kGy gamma radiation dose, showed physical and chemical structural changes that positively influence the fiber-matrix adhesion in polymer composite materials. All treatments made can reduce the natural tensile properties of the sisal fibers, because they can remove fundamental components to the structure and the stiffening of these fibers. Considering changes in the mechanical behavior, the use of gamma radiation presented similar results of the traditional chemical treatments, being less aggressive to the fibers and not causing the same negative impact on the environment.

天然纤维中大量使用处理剂是因为它可以改善聚合物复合材料的界面粘合力。但是，由于需要新材料以满足与可持续性概念相关的要求，因此选择最合适的处理方法时应考虑环境因素。本文研究了丝光处理，乙酰化和γ辐射处理对剑麻纤维机械性能的影响，以用于复合材料。为了了解这些反应对剑麻纤维拉伸性能的影响，用不同浓度的试剂和辐射剂量定义了实验条件。使用热重分析（TGA）和傅立叶变换红外（FTIR）光谱研究了纤维降解过程以及处理后的化学改性。丝光处理（0.1 M和1.0 M NaOH浓度）与乙酰化结合使用可提高剑麻纤维的疏水性，从而可改善其与聚合物基质的相互作用。此外，暴露在25 kGyγ射线剂量下的0.5 M NaOH浓度的丝光剑麻纤维显示出物理和化学结构变化，对聚合物复合材料中的纤维-基质粘附有积极影响。进行的所有处理均会降低剑麻纤维的自然拉伸性能，因为它们会去除结构中的基本成分以及这些纤维的硬度。