Physico-chemical, Thermal and Tensile Properties of Alkali-treated Acacia Concinna Fiber

ABSTRACT

The fundamental properties (diameter, density, chemical composition, crystalline nature, thermal behaviors, tensile properties and Surface topography) of the raw and alkalized Acacia Concinna fiber (ACF) were investigated in this article with the intension verify the fitness of Acacia Concinna fiber as reinforcement in green composites. Outcomes of the chemical analysis established that 5% (w/v) NaoH with 45 min treatment time was produced the optimistic transform in the chemical composition than other treatment timings (15, 30,60,75 min). The diminution in the lignin and hemi-cellulose content of the alkalized ACF was established through the Fourier-transform infrared (FTIR) and Nuclear magnetic resonance (NMR) spectrograms. Improvements in the crystallographic parameters (Crystallinity index (27.5% to 35.6%) and crystalline size (4.17 nm to 6.43 nm) of optimally alkalized ACF were demonstrated through the X-Ray diffraction (XRD) analysis. The mass degradation pattern (TG and DTG profile) of the untreated and optimally alkalized ACF were generated with the help of a thermal analyzer. Scanning electron microscope and atomic force microscope were used to record the impact of alkalization in surface topography of the ACF.

摘要

本文研究了原丝相思纤维和碱化金合欢纤维 (ACF) 的基本性能 (直径, 密度, 化学成分, 结晶性质, 热性能, 拉伸性能和表面形貌), 并对其作为绿色复合材料增强体的适宜性进行了验证. 化学分析结果表明, 5% (w/v) NaoH处理45min后, 化学成分的变化比其他处理时间 (15, 30, 60, 75 min) 要乐观. 通过傅立叶变换红外光谱 (FTIR) 和核磁共振 (NMR) 谱图, 确定了碱化活性炭纤维中木质素和半纤维素含量的降低. X射线衍射 (XRD) 分析表明, 最佳碱化ACF的结晶参数 (结晶度指数27.5%～35.6%) 和晶粒度 (4.17nm～6.43nm) 有所改善. 在热分析仪的帮助下, 生成了未处理和最佳碱化活性炭纤维的质量降解模式 (TG和DTG曲线). 用扫描电镜和原子力显微镜观察碱化对活性炭纤维表面形貌的影响.

KEYWORDS:

• Acacia Concinna fiber
• alkalization
• nuclear magnetic resonance spectroscopy
• tensile strength
• surface roughness
• EDX analysis

关键词:

• 金合欢纤维
• 碱化
• 核磁共振波谱
• 抗拉强度
• 表面粗糙度
• 分析