Mechanical behaviors of composites made of natural fibers through environmentally friendly treatment

IF 3.6 4区 材料科学 Q2 MATERIALS SCIENCE, COMPOSITES Journal of Thermoplastic Composite Materials Pub Date : 2024-03-15 DOI:10.1177/08927057241239954
Shuo Sun, Selvum Pillay, Haibin Ning
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Abstract

Natural fiber reinforced composites have garnered significant interests as potential substitutes for conventional materials because of their eco-friendly attribute and favorable physical and mechanical properties. Typically the natural fiber undergoes chemical treatment before processing with the matrix to produce composites, however, the chemical treatment can have a negative impact on the environment. This research work presents an environmentally friendly treatment method for hemp fibers by using boiling water and shear force for specific time periods. The purpose of the treatment is to break down the technical fiber bundles into elementary fibers, which creates a fourfold increase in bonding surface area between the fibers and matrix. The change in fiber length and size before and after the debundling treatment were analyzed using optical microscope, confocal microscope, and scanning electron microscopy. The treated fibers were then made into mats through a wet-laid process and compression molded with low density polyethylene via film stacking. The effects of different fiber treatment variables, including debundling time, on mechanical properties were compared with composites reinforced with conventional alkali treated fibers. The results presented show that the composites reinforced by hemp fiber using the new treatment method have equivalent or improved tensile, flexural and impact properties than the composite reinforced with alkali treated fibers.
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通过环保处理实现天然纤维复合材料的机械性能
天然纤维增强复合材料作为传统材料的潜在替代品,因其环保属性和良好的物理和机械性能而备受关注。通常情况下,天然纤维在与基体加工成复合材料之前要经过化学处理,然而,化学处理会对环境产生负面影响。这项研究工作提出了一种环境友好型大麻纤维处理方法,即在特定时间段内使用沸水和剪切力。处理的目的是将技术纤维束分解成基本纤维,使纤维与基体之间的结合表面积增加四倍。使用光学显微镜、共聚焦显微镜和扫描电子显微镜分析了去毛刺处理前后纤维长度和尺寸的变化。然后通过湿法铺设工艺将处理过的纤维制成毡,并通过薄膜堆叠法与低密度聚乙烯进行压缩成型。与传统碱处理纤维增强的复合材料相比,不同的纤维处理变量(包括拆散时间)对机械性能的影响有所不同。研究结果表明,与使用碱处理纤维增强的复合材料相比,使用新处理方法增强的麻纤维复合材料具有同等或更好的拉伸、弯曲和冲击性能。
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来源期刊
Journal of Thermoplastic Composite Materials
Journal of Thermoplastic Composite Materials 工程技术-材料科学:复合
CiteScore
8.00
自引率
18.20%
发文量
104
审稿时长
5.9 months
期刊介绍: The Journal of Thermoplastic Composite Materials is a fully peer-reviewed international journal that publishes original research and review articles on polymers, nanocomposites, and particulate-, discontinuous-, and continuous-fiber-reinforced materials in the areas of processing, materials science, mechanics, durability, design, non destructive evaluation and manufacturing science. This journal is a member of the Committee on Publication Ethics (COPE).
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