Physico-chemical characterization of Grewia Monticola Sond (GMS) fibers for prospective application in biocomposites

ABSTRACT

New fibers extracted from plant barks are a recent subject of investigation as possible fillers for polymer composites. In this work, Grewia Monticola Sond (GMS) fibers have been characterized from a morphological, chemical, and thermal point of view. This involved using a number of techniques, including Fourier infrared spectroscopy (FTIR), X-ray diffraction (×RD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), atomic force microscopy (AFM), and ¹³C nuclear magnetic resonance (NMR). Results indicated that GMS fibers have relatively high cellulose (55%), with 33.5% crystallinity index and a crystallite size of 4.89 nm, and lower hemicellulose (14%) and lignin (15%) contents. The fibers showed cellulose degradation onset at around 324°C, while kinetic activation energy (74.18 kJ/mol) is quite low. The roughness of the fibers was in the range expected for similar natural fibers, and they may be considered silky according to their kurtosis values. As for possible application in composites, they would definitely withstand process temperatures with thermoplastics. However, their not very high crystallinity and low crystallite size might suggest a limited strength, to be verified in future after optimizing GMS fiber extraction from bark.

摘要

从植物树皮中提取的新纤维作为聚合物复合材料的可能填料是最近的研究课题. 在这项工作中, 从形态、化学和热的角度对Grewia Monticola Sond (GMS) 纤维进行了表征这涉及使用多种技术, 包括傅里叶红外光谱 (FTIR) 、X射线衍射 (XRD) 、. 振 (NMR) . 结果表明, GMS纤维具有相对较高的纤维素 (55%), 结晶度指数为33.5%, 微晶尺寸为4.89nm, 半纤维素 (14%) 和木质素 (15%) 含量较低纤维在324°C左右开始纤维素降解, 而动. 力学活化能 (74.18 kJ/mol) 相当低. 纤维的粗糙度在类似天然纤维的预期范围内, 根据峰度值, 它们可以被认为是丝滑的至于在复合材料中的可能应用, 它们肯定能承受热塑性塑料的工艺温度. 然而, 它们的. 结晶度不是很高, 晶粒尺寸很小, 可能表明强度有限, 这将在优化从树皮中提取GMS纤维后进行验证.

KEYWORDS:

• Bark fibers
• grewia monticola
• FTIR
• X-Ray diffraction
• NMR
• roughness measurement

关键词:

• 树皮纤维
• X射线衍射
• 粗糙度测量

Disclosure statement

No potential conflict of interest was reported by the author(s).