College of Textiles, Donghua University, 201600 Shanghai, China; Key Laboratory of Textile Science & Technology, College of Textiles, Donghua University, Ministry of Education, China.
College of Textiles, Donghua University, 201600 Shanghai, China.
Carbohydr Polym. 2022 Dec 1;297:119996. doi: 10.1016/j.carbpol.2022.119996. Epub 2022 Aug 16.
Windmill palm fibres are well-known plant fibres exhibiting the largest elongation at break. In this study, lignin or hemicellulose was removed from windmill palm fibres in a targeted manner to prepare materials with different chemical compositions. The structure and mechanical properties of the windmill palm fibres were analysed using in situ scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetry, X-ray diffraction analysis and tensile testing. The large elongation at break was attributed to the unwinding of the single fibre, the micro cracks and the small degree of orientation (<62 %). On a microscopic scale, the lumen shape of fibre cross section influences the local stress distribution. The hemicellulose-removed fibres exhibited a high breaking strength of 236 MPa with deterioration of the thermal property. The binding force between single fibres is the weakest after lignin removal. The removal of hard lignin softens the fibres and increases the elongation at break to >30 %.
风车麻纤维是一种具有较大断裂伸长率的知名植物纤维。本研究采用有针对性的方法从风车麻纤维中去除木质素或半纤维素，以制备具有不同化学成分的材料。利用原位扫描电子显微镜、傅里叶变换红外光谱、热重分析、X 射线衍射分析和拉伸试验对风车麻纤维的结构和力学性能进行了分析。较大的断裂伸长率归因于单纤维的展开、微裂纹和较小的取向度（<62%）。在微观尺度上，纤维横截面的腔形影响局部应力分布。去除半纤维素的纤维具有 236 MPa 的高断裂强度，但热性能恶化。木质素去除后，单纤维之间的结合力最弱。硬木质素的去除使纤维变软，断裂伸长率增加到>30%。
