https://orcid.org/0000-0002-0172-1032
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ABSTRACT
The purpose of this present investigation is to characterize the cellulosic fibers extracted from the bark of Piliostigma racemosa plant to assess the suitability of these fibers for reinforcing polymers. Characterization tests conducted are reported proving the reinforcing capability of these fibers. Chemical analysis shows the presence of cellulose (60.30 wt. %), lignin (30.76 wt. %), wax (0.63 wt. %), ash (1.12 wt. %) and wetness content (6.92 wt. %) with the fiber density of 1.371 g/cm3. Tensile strength, strain and Young’s modulus of the fibers were 32MPa, 1.2–3.2% and 2GPa, respectively. Fourier Transform Infrared studies prove the presence of essential biopolymers and the X-ray diffraction studies purports the semi crystalline cellulose content with crystallinity index and the crystallite size calculated as 56.69% and 5.25 nm, respectively, and the mean micro-fibrillar angle of the fibers was found as 18.9°. The fibers are capable of sustaining a temperature of about 244°C as ascertained from the thermo-gravimetric analysis. The surface morphology claims that the fibers are rough and they can maintain a good interfacial adhesion with the matrix during composite fabrication. Thus, the fibers possess sufficient physico-chemical, thermal, and morphological features that enable them to be potential reinforcing agents in polymer composites.
摘要
本研究的目的是表征从总状毛皮草树皮中提取的纤维素纤维，以评估这些纤维对增强聚合物的适用性. 进行了表征试验，证明了这些纤维的增强能力. 化学分析表明存在纤维素（60.30 wt.%）、木质素（30.76 wt.%）、蜡（0.63 wt.%）、灰分（1.12 wt.%）和湿含量（6.92 wt.%），纤维密度为1.371 g/cm3. 纤维的拉伸强度、应变和杨氏模量分别为32MPa、1.2～3.2%和2GPa. 傅立叶变换红外光谱研究证实了必需的生物大分子的存在，X射线衍射研究表明半结晶纤维素含量为56.69%，结晶指数为5.25nm，平均微纤丝角为18.9°. 根据热重分析确定，纤维能够维持约244℃的温度. 表面形貌表明，纤维表面粗糙，在复合材料制备过程中能与基体保持良好的界面结合. 因此，纤维具有足够的物理化学、热学和形态特征，使其成为聚合物复合材料中潜在的增强剂.