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Effect of UV-water weathering on the mechanical properties of flax-fiber-reinforced polymer composites
Polymer Composites ( IF 4.8 ) Pub Date : 2023-12-21 , DOI: 10.1002/pc.28057
Bowen Xu 1 , Bart van den Hurk 1 , Tao Liu 1 , Rijk Blok 1 , Patrick Teuffel 1
Affiliation  

This study examines the influence of weathering aging on the mechanical properties and durability of flax fiber-reinforced polymer composites (FFRP) intended for outdoor applications. Employing an accelerated weathering environment replicating natural outdoor conditions, encompassing UV radiation, condensation, and water spray, the FFRP samples with 2 and 4 mm thicknesses underwent exposure durations of 0, 500, 1000, and 1500 h. Mechanical tests characterized tensile, flexural, and inner-plane shear properties, while a custom-made apparatus measured the long-term tensile creep behavior. Additionally, scanning electron microscopy allowed for the observation of microscopic changes in fiber and matrix. The findings illustrate a consistent decline in tensile and flexural properties with increased weathering exposure, resulting in reductions of 17% and 38% in the tensile strength and modulus, and 24% and 52% in the flexural strength and modulus after 1500 h. Intriguingly, inner-plane shear strength exhibited a slight increase after 500 h before a subsequent decrease. Furthermore, samples with the same thickness demonstrated an increased creep development with longer weathering durations. Despite this, the mechanical degradation rate induced by weathering was comparatively slower for thicker samples. Overall, the diminished mechanical properties of FFRP post-weathering can be attributed not only to the polymer but also to the substantial role played by flax fibers in this process.

中文翻译:

紫外-水老化对亚麻纤维增强聚合物复合材料力学性能的影响

本研究探讨了风化老化对户外应用的亚麻纤维增强聚合物复合材料 (FFRP) 的机械性能和耐久性的影响。采用复制自然户外条件的加速风化环境,包括紫外线辐射、冷凝和喷水,厚度为 2 毫米和 4 毫米的 FFRP 样品经历了 0、500、1000 和 1500 小时的暴露时间。机械测试表征了拉伸、弯曲和内平面剪切性能,而定制设备则测量了长期拉伸蠕变行为。此外,扫描电子显微镜可以观察纤维和基质的微观变化。研究结果表明,随着风化暴露的增加,拉伸和弯曲性能持续下降,导致 1500 小时后拉伸强度和模量下降 17% 和 38%,弯曲强度和模量下降 24% 和 52%。有趣的是,内面剪切强度在 500 小时后略有增加,然后又下降。此外,具有相同厚度的样品显示蠕变发展增加,风化持续时间更长。尽管如此,对于较厚的样品,风化引起的机械降解速率相对较慢。总体而言,FFRP 后风化后机械性能的下降不仅可以归因于聚合物,还可以归因于亚麻纤维在此过程中发挥的重要作用。
更新日期:2023-12-21
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