ABSTRACT

This study investigated the influence of the surface treatment of curaua fibres (Ananas erectifolius) on the morphological, thermal and mechanical properties of polyester composites when the treated fibres (10 wt-%) were added. The following treatment agents were assessed: 10% Ba(OH)₂, 14% Ca(OH)₂, 5% NaOH, 10% KOH and 5% silane. The treatments removed amorphous components, thereby increasing the crystallinity of the fibres. Among the alkali treatments, KOH gave the highest crystallinity index (67.09%), Ca(OH)₂ had the best tensile strength (19 MPa) and Ca(OH)₂ treatment resulted in the highest composite thermal stability (315°C). Fibres treated with Ba(OH)₂ resulted in the composite with the greatest resistance to impact (55 vs 10 J m⁻¹ for the neat matrix). Finally, the silane-treated fibres resulted in composites with a better performance than the other treatments. There was a prominent pattern of improved performance for the silane-treated fibre composites in all the analyses performed in this study.

摘要

这项研究研究了在添加10％（重量）处理过的纤维后，姜黄纤维（凤梨（Ananas erectifolius））的表面处理对聚酯复合材料的形貌，热学和机械性能的影响。下列处理剂进行了评估：10％的Ba（OH）₂，14％的Ca（OH）₂，5％的NaOH，10％KOH和5％的硅烷。这些处理去除了无定形组分，从而增加了纤维的结晶度。在碱处理中，KOH的结晶度最高（67.09％），Ca（OH）₂的拉伸强度最高（19 MPa），Ca（OH）_2的处理最高的复合材料热稳定性（315°C）。Ba（OH）₂处理的纤维导致复合材料具有最大的抗冲击性（对于纯净基质，其抗压强度为55 vs 10 J m ^-1）。最后，经过硅烷处理的纤维比其他处理方法具有更好的性能。在这项研究中进行的所有分析中，硅烷处理的纤维复合材料均具有明显的性能改善模式。