Characterization of microfiber isolated from Hibiscus sabdariffa var. altissima fiber by steam explosion

ABSTRACT

In this work, the analytical and experimental study on isolation of microfibers from Hibiscus sabdariffa var. altissima fiber using the steam explosion technique is discussed. Structural and thermal analysis of fiber is done by thermogravimetric analysis (TGA), X-ray diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy. Scanning electron microscope image confirmed that the diameter of the fiber is reduced to approximately 5 µm and defibrillation of the fiber after bleaching process is also observed. XRD analysis of H. sabdariffa fiber at raw and acid hydrolyses stage demonstrated that the crystallinity index is increased from 77.8% to 86.7%. FT-IR results indicated the devaluation of lignin and hemicellulose after the chemical treatment and enhancement of thermal stability can also be seen by TGA results.

摘要

本文讨论了用蒸汽爆破技术从木槿纤维中分离超细纤维的分析和实验研究。通过热重分析（TGA）、X射线衍射（XRD）和傅立叶变换红外光谱（FT-IR）对纤维进行结构和热分析。扫描电子显微镜（SEM）图像证实，纤维直径减小到约5μm，并观察到漂白后纤维的除颤。在生酸和酸解阶段对木槿纤维进行X射线衍射分析，结果表明，结晶度指数（CI）由77.8提高到86.7%。傅立叶变换红外光谱结果表明，在化学处理后木质素和半纤维素的贬值和热稳定性的增强也可以通过热重分析结果看到。

KEYWORDS:

• Cellulose
• steam explosion
• composites
• Hibiscus sabdariffa fiber
• crystallinity
• microfibers

关键词:

• 纤维素
• 蒸汽爆炸
• 复合材料
• 木槿纤维
• 结晶性
• 超细纤维