The aim of present study is to extract microcrystalline cellulose (MCC) from fruit bunch branches fibers of Algerian date palm trees (phoenix dactylifera L) as biofiber for reinforcing green composite and thus replace synthetic fibers in various applications. The extraction of MCC from date palm fibers passed via serial chemical treatments, including alkali, bleaching and acid hydrolysis process. Subsequently, several analyses were implemented to determine the characteristics of each sample prepared at different stages of treatment. Fourier transform infrared spectroscopy (FTIR) analysis revealed the effectiveness in removing substantial amorphous components of lignin and hemicellulose from date palm fibers. Altered and irregular shaped morphology of microfibrils with slightly rougher surface was observed for microcrystalline date palm fibers (MCC-DP) through scanning electron microscope (SEM) examination. Furthermore, X-ray diffraction (XRD) presents the increasing of the crystallinity from 55% in raw date palm (R-DP) to 76.26% in MCC-DP. Also, the results of TGA and DSC indicate the MCC-DP has greater thermal stability than that of R-DP, A-DP and B-DP fibers. These results demonstrate the feasibility of using date palm waste (fruit bunch branches fibers) to extract a good reinforcing material (MCC) with high properties and low cost, which qualifies its use in composite materials. Also, it can be transformed into nano-scale for isolating nanocrystalline cellulose with the aim of using it, in the future to produce ecofriendly bionanocomposites in different fields of applications, biomedical, pharmaceutical and packaging.

本研究的目的是从阿尔及利亚枣椰树（凤凰果）的果枝分支纤维中提取微晶纤维素（MCC）作为生物纤维，以增强绿色复合材料，从而在各种应用中替代合成纤维。从枣椰子纤维中提取MCC经过一系列化学处理，包括碱，漂白和酸水解过程。随后，进行了几次分析以确定在不同处理阶段制备的每个样品的特性。傅里叶变换红外光谱（FTIR）分析表明，从枣椰子纤维中去除木质素和半纤维素的大量非晶态成分非常有效。通过扫描电子显微镜（SEM）观察到微晶枣椰子纤维（MCC-DP）观察到了表面稍粗糙的微纤维形态和不规则形状的变化。此外，X射线衍射（XRD）表示结晶度从原始椰枣（R-DP）中的55％增加到MCC-DP中的76.26％。另外，TGA和DSC的结果表明MCC-DP具有比R-DP，A-DP和B-DP纤维更高的热稳定性。这些结果证明了使用枣椰子废料（水果束分支纤维）提取具有高性能和低成本的良好增强材料（MCC）的可行性，这证明了其在复合材料中的使用资格。同样，可以将其转化为纳米级，以分离出纳米晶纤维素，以使用它为目标，