ABSTRACT

This investigation is aimed to analyze the effect of sodium hydroxide (NaOH) treatment on the physical, chemical, structural, thermal and surface topography of Phaseolus vulgaris fibers (PVFs). The surface of raw PVFs was modified by soaking with 5% NaOH solution for 15, 30, 45 and 60 min. The various functional groups of the alkali-treated PVFs (APVFs) were studied Fourier-transform infrared spectroscopy. The outcomes of thermogravimetric analysis evident that the optimum treatment time for 5% NaOH was 45 min. It was noticed that optimally treated PVFs have higher cellulose (69.48 wt.%), crystallinity index (52.27%) and lower hemicellulose (4.30 wt.%), lignin (7.02 wt.%) contents. The thermogravimetric analysis (TGA) of PVFs also revealing moderate thermal stability was observed; atomic force microscopy (AFM) investigation inveterates that the surface of the fiber is rough and it will be a potential reinforcement for polymer composites.

摘要

本研究旨在分析氢氧化钠 (NaOH) 处理对菜豆的物理、化学、结构、热和表面形貌的影响纤维（PVF）。通过用 5% NaOH 溶液浸泡 15、30、45 和 60 分钟对原始 PVF 的表面进行改性。对碱处理 PVF (APVF) 的各种官能团进行了傅里叶变换红外光谱研究。热重分析结果表明，5% NaOH 的最佳处理时间为 45 分钟。注意到经过优化处理的 PVF 具有更高的纤维素（69.48 wt.%）、结晶度指数（52.27%）和更低的半纤维素（4.30 wt.%）、木质素（7.02 wt.%）含量。观察到 PVF 的热重分析 (TGA) 也显示出中等的热稳定性；原子力显微镜 (AFM) 研究表明，纤维表面粗糙，将成为聚合物复合材料的潜在增强材料。