Influence of Alkali Treatment on Physicochemical, Thermal and Mechanical Properties of Hibiscus Vitifolius Fibers

ABSTRACT

Hibiscus vitifolius was found to possess the promising potential required for reinforcing polymer matrices. In this study, Hibiscus vitifolius fibers were immersed in 2, 3, 4, 5, 6, 7, and 8% NaOH solution for 1 hr and the effects of alkali treatment on chemical, mechanical and thermal characteristics of the fiber were evaluated through chemical tests, X-ray diffraction, Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis, tensile tests, and field emission scanning electron microscopy. From the test results, it was inferred that Hibiscus vitifolius fibers treated using 5% NaOH exhibited high crystallinity, tensile strength, and Young’s modulus compared to raw fibers. Beyond 5% NaOH treatment, the fibers suffered a decline in crystallinity index and mechanical properties. The morphological analysis of alkali-treated fibers revealed the removal of amorphous constituents and separation of fiber bundles into individual fiber filaments.

摘要

木槿被发现具有增强聚合物基质所需的潜力. 在本研究中, 将木槿纤维浸泡在2,3,4,5,6,7和8%的NaOH溶液中1小时, 通过化学测试、X-射线衍射、傅里叶变换红外光谱 (FT-IR)、热重分析、, 拉伸试验和场发射扫描电子显微镜. 从测试结果可以推断, 与未加工纤维相比, 使用5%NaOH处理的芙蓉纤维具有较高的结晶度、拉伸强度和杨氏模量. 在5%NaOH处理后, 纤维的结晶指数和机械性能下降. 碱处理纤维的形态分析显示, 无定形成分被去除, 纤维束分离成单个纤维长丝.

KEYWORDS:

• Hibiscus vitifolius
• NaOH treatment
• thermal stability
• Fourier transform-infrared spectroscopy
• thermogravimetric analysis
• X-ray diffraction

关键词:

• 木槿
• NaOH治疗
• 热稳定性
• 傅里叶变换红外光谱
• 热重分析
• X-射线衍射