Mechanical and physical characterization of sodium hydroxide treated Borassus fruit fibers

In order to improve the properties by chemical modification and to optimize the alkali concentration, we treated Borassus fruit fine fibers with aqueous sodium hydroxide solutions of different concentra- tions. In each case, the tensile properties of the fibers were determined. The morphology of the untreated and alkali treated fibers was observed using scanning electron microscope. The surface of the fibers became rough on alkali treatment. The tensile properties of the fibers improved on alkali treatment. The fibers attained maximum tensile properties when treated with 15% aqueous sodium hydroxide solution and decreased thereafter. The crystallinity index of the fibers showed a similar trend. The thermal stability of the alkali treated fibers was found to be higher than that of untreated fibers. Further, the char content was maximum for fibers treated with alkali having concentration of 15% and above. The chemical composition indicated that the percentageof a-cellulose was maximum when the fibers were treated with 15% aqueous sodium hydroxide solution and then decreased thereafter thus indicating the beginning of degradation of the fibers at higher concentrations. Thus, the optimum concentration of NaOH was established as 15% for alkali treatment of the Borassus fibers.

椰子树叶鞘纤维增强体的结构特征(英文)

利用傅立叶红外光谱分析、化学分析、X射线和差热分析等方法,分析和评价了椰子树叶鞘纤维在制备绿色复合材料的用作纤维增强体适应性。用电镜扫描的方法研究了经碱处理和末处理的纤维形态。FTIR光谱分析和化学分析结果表明,经碱处理的纤维中半纤维素含量降低;X射线衍射证实碱处理的纤维结品度增加。碱处理的纤维热稳定性略有增加,且抗拉性能也有所增加。综合机械和其他物理性能,这种椰子树叶鞘纤维增强体适用于制作绿色复合材料。图5表4参24。