ABSTRACT

In this paper, the physical, chemical, and thermal properties of cellulosic fiber extracted from the stem of Sida acuta have been reported. Tests such as tensile, chemical, thermo gravimetric analysis, X-ray diffraction, and Fourier transform infrared spectroscopy were conducted on Sida acuta fibers (SAFs). From the test results, it was found that SAFs possess high cellulose content (72.99 wt.%), high tensile strength (627 ± 14 MPa), high crystallinity index (67.70%), and high thermal stability (up to 240°C). Furthermore, the water absorption and mechanical properties of Sida acuta fiber reinforced epoxy composite added with fly ash filler were studied through tensile, flexural, and impact test as per the ASTM standards. The composite samples were prepared by varying the weight fraction of fly ash at 1, 1.5, 2, and 2.5 wt.%. The experimental results revealed that the composites added with 2 wt.% fly ash exhibited superior mechanical properties when compared to other samples. The surface morphological changes of fiber-matrix interface due to the presence of fly ash were confirmed through the field emission scanning electron microscope images obtained from the fractured tensile specimens.

摘要

在本文中，报道了从四叶草茎中提取的纤维素纤维的物理、化学和热特性。对Sida acuta纤维 (SAF)进行了拉伸、化学、热重分析、X 射线衍射和傅里叶变换红外光谱等测试。从测试结果中发现，SAFs 具有高纤维素含量 (72.99 wt.%)、高拉伸强度 (627 ± 14 MPa)、高结晶指数 (67.70%) 和高热稳定性（高达 240°C） . 此外，Sida acuta 的吸水率和机械性能根据 ASTM 标准，通过拉伸、弯曲和冲击试验对添加了粉煤灰填料的纤维增强环氧树脂复合材料进行了研究。通过将粉煤灰的重量分数改变为 1、1.5、2 和 2.5 重量％来制备复合样品。实验结果表明，与其他样品相比，添加 2 wt.% 粉煤灰的复合材料表现出优异的机械性能。通过从断裂拉伸试样获得的场发射扫描电子显微镜图像证实了由于飞灰的存在而导致的纤维-基体界面的表面形态变化。