Environmental issues have become a worldwide crisis because of the high rate of pollution and changing climate patterns. Due to innovations and discoveries, the need for materials is increasing day by day. Here, composite materials can be substituted for any other mono-clinic materials fulfilling the requirements of those particular materials. However, the maximum composite materials are man-made or artificially fabricated fibers. These are not environmentally friendly and bio-degradable, which creates an environmental hazard. So, scientists are trying to fabricate composite materials from eco-friendly and green resources. The main advantages of natural fibers are their low cost, easy availability, and low density. Besides these acceptable specific properties, ease of separation, increasing energy recovery, carbon-oxide neutrality, and recyclable properties are increasing the popularity of natural fiber. In this study, we have used mainly two types of banana fiber for preparing the composite specimens, especially highlighting the hybrid fiber, which is made by mixing those two types of fiber: “Shobri” and “Champa” banana fibers. These names are renowned locally in Bangladesh. In this study, polyester and MEKP are used as matrix and hardener sequentially. We have accomplished a chemical treatment process. The treating process was accomplished in the alkaline medium with two different molar concentrations of NaOH. These are 1% and 5% solutions of NaOH. After the treatment neutralization process was performed with a 1 gm/L acetic acid solution. In addition, two distinct mechanical tests— the bending and tensile tests—were carried out. The results indicated that the hybrid fiber treated with 1% NaOH had the highest tensile properties; its Young’s modulus was around 625 MPa and its tensile strength was approximately 36.42 MPa. The tensile strength and Young’s modulus of Champa banana fiber treated with 1% and 5% NaOH solutions were the lowest, respectively. Approximate values are 1.82 GPa and 18.3 MPa. The flexural strength of hybrid fiber treated with 1% and 5% NaOH was the highest and lowest in that order. 69.2 MPa and 56.21 MPa, respectively, are their values. Regarding flexural modulus, Champa fiber treated with 5% and 1% NaOH exhibits the highest and lowest values, measuring roughly 4 and 1.82 GPa, respectively.

中文翻译：

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氢氧化钠处理香蕉纤维增强复合材料的特性及对比研究

由于高污染率和不断变化的气候模式，环境问题已成为全球性危机。由于创新和发现，对材料的需求日益增加。这里，复合材料可以替代满足那些特定材料的要求的任何其他单斜晶材料。然而，最多的复合材料是人造或人工制造的纤维。这些不环保且不可生物降解，从而造成环境危害。因此，科学家们正在尝试利用环保和绿色资源制造复合材料。天然纤维的主要优点是成本低、容易获得和密度低。除了这些可接受的特定性能之外，易于分离、增加能量回收、碳氧化物中性和可回收性能正在提高天然纤维的受欢迎程度。在这项研究中，我们主要使用两种类型的香蕉纤维来制备复合材料样本，特别强调混合纤维，它是通过混合这两种类型的纤维制成的：“Shobri”和“Champa”香蕉纤维。这些名字在孟加拉国当地享有盛誉。在本研究中，聚酯和MEKP依次用作基体和硬化剂。我们已经完成了化学处理过程。处理过程是在具有两种不同摩尔浓度的NaOH的碱性介质中完成的。这些是 1% 和 5% 的 NaOH 溶液。处理后用1gm/L乙酸溶液进行中和过程。此外，还进行了两项不同的机械测试——弯曲和拉伸测试。结果表明，经1%NaOH处理的混杂纤维具有最高的拉伸性能；其杨氏模量约为625 MPa，拉伸强度约为36.42 MPa。经1％和5％NaOH溶液处理的Champa香蕉纤维的拉伸强度和杨氏模量分别最低。近似值为 1.82 GPa 和 18.3 MPa。经1％和5％NaOH处理的混合纤维的弯曲强度依次最高和最低。它们的值分别为 69.2 MPa 和 56.21 MPa。关于弯曲模量，用 5% 和 1% NaOH 处理的 Champa 纤维表现出最高和最低值，分别约为 4 和 1.82 GPa。