Strong high-density composites from wheat straw

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing Pub Date : 2024-10-18 DOI:10.1016/j.compositesa.2024.108533

引用次数: 0

Abstract

Wheat straw represents a promising resource for structural materials due to its inherent strength and availability as an underutilized agricultural by-product. However, structural features such as small diameters and a hollow, low-density design, as well as a hydrophobic, waxy surface layer, hinder conventional processing. We present an approach to overcome these hindrances by engineering delignified and densified straw strands into a mechanically strong unidirectional composite material. Wheat straw split into strands along the fiber direction was subjected to water-based and mild alkaline pre-treatments and subsequently densified. As a result, the average tensile strength and modulus of elasticity of straw strands improved to impressive 466 MPa and 26 GPa, respectively. Simultaneously, chemical changes to the surface enabled better adhesive bonding. The resulting unidirectional straw composites exhibited a flexural strength of 190 MPa and an elastic modulus of 20 GPa, well within the range of established wood and bamboo-based materials.

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利用小麦秸秆制成强力高密度复合材料

小麦秸秆作为一种未充分利用的农副产品，其固有的强度和可用性使其成为一种很有前景的结构材料资源。然而，小直径、中空、低密度设计以及疏水蜡质表层等结构特征阻碍了传统的加工工艺。我们提出了一种克服这些障碍的方法，即将木质素化和致密化的秸秆股加工成机械强度高的单向复合材料。将小麦秸秆沿纤维方向分割成股，进行水基和弱碱性预处理，然后进行致密化。结果，秸秆股的平均拉伸强度和弹性模量分别提高到了令人印象深刻的 466 兆帕和 26 千兆帕。与此同时，秸秆表面的化学变化也使粘合剂的粘合效果更好。由此产生的单向稻草复合材料显示出 190 兆帕的抗弯强度和 20 GPa 的弹性模量，远在木基和竹基材料的范围之内。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Composites Part A: Applied Science and Manufacturing 工程技术-材料科学：复合

CiteScore

15.20

自引率

5.70%

发文量

492

审稿时长

30 days

期刊介绍： Composites Part A: Applied Science and Manufacturing is a comprehensive journal that publishes original research papers, review articles, case studies, short communications, and letters covering various aspects of composite materials science and technology. This includes fibrous and particulate reinforcements in polymeric, metallic, and ceramic matrices, as well as 'natural' composites like wood and biological materials. The journal addresses topics such as properties, design, and manufacture of reinforcing fibers and particles, novel architectures and concepts, multifunctional composites, advancements in fabrication and processing, manufacturing science, process modeling, experimental mechanics, microstructural characterization, interfaces, prediction and measurement of mechanical, physical, and chemical behavior, and performance in service. Additionally, articles on economic and commercial aspects, design, and case studies are welcomed. All submissions undergo rigorous peer review to ensure they contribute significantly and innovatively, maintaining high standards for content and presentation. The editorial team aims to expedite the review process for prompt publication.