Effects of mercerization in the chemical and morphological properties of amazon piassava

Abstract The objective of this work was to investigate the effects of mercerization on chemical, morphological and thermal properties of Amazon Piassava Fibers. The effect of this treatment was studied using XRF, SEM, XRD and TGA. The fibers have been treated in 5% and 10% NaOH for 60 min. The XRF results for treated and untreated fibers showed that there is a decrease in the amount of SiO 2 by increasing the NaOH concentration. It has been possible to observe through SEM in untreated fiber that the surface presents a well arranged pattern of silicon rich star-like protrusions. For the two concentrations, SEM allowed to notice that the removal of deleterious surface impurities and fiber roughness was enhanced. The removal of organic material after treatment can be observed in the TGA analysis. XRD analysis indicate an increase in the crystallinity index, 0.19 to 0.31 after the treatment for 10% concentration solutions.

摘要 本研究旨在探讨丝光处理（mercerization）对亚马逊皮瓦纤维（Amazon Piassava Fibers）化学、形貌及热学性能的影响。本研究采用X射线荧光光谱（XRF）、扫描电子显微镜（SEM）、X射线衍射（XRD）与热重分析（TGA）对该处理的效果展开研究。实验将纤维分别置于5%与10%的氢氧化钠（NaOH）溶液中处理60分钟。X射线荧光光谱测试结果显示，经处理与未处理的纤维中，二氧化硅（SiO₂）的含量随氢氧化钠溶液浓度升高而降低。通过扫描电子显微镜观测可发现，未处理纤维的表面呈现出排列规整的富硅星状凸起结构。针对两种处理浓度，扫描电子显微镜结果均表明，有害表面杂质的去除效果与纤维表面粗糙度的改善均得到增强。热重分析可观测到处理后纤维中有机物质的脱除情况。X射线衍射分析结果显示，经10%浓度溶液处理后，纤维的结晶度指数从0.19提升至0.31。