在聚合物复合材料中加入天然木质纤维素纤维作为增强材料,由于其可生物降解性,已经见证了显着的增长。成本效益,和机械性能。本研究旨在评估蓖麻油基聚氨酯(COPU),掺入不同含量的椰子纤维,5、10和15重量%。调查包括对身体的分析,机械,和这些复合材料的微观结构性能。此外,这项研究评估了水热处理对纤维的影响,在120°C和98kPa下进行30分钟,关于生物复合材料的属性。椰壳纤维(CFs)和水热处理的椰壳纤维(HTCFs)都进行了全面的表征,包括木质纤维素成分分析,扫描电子显微镜(SEM),傅里叶变换红外光谱(FTIR),X射线衍射(XRD)和热重分析(TGA)。对生物复合材料进行吸水率分析,弯曲试验,XRD,SEM,FTIR,和TGA。结果表明,30min水热处理降低了萃取物含量,增强纤维和基体之间的界面粘附力,正如SEM所证明的那样。值得注意的是,含有5重量%CF的复合材料表现出降低的吸水率,接近纯COPU中观察到的水平。包含15重量%的HTCF可显著提高复合材料的弯曲强度(100%),弹性模量(98%),与纯COPU相比,韧性(280%)。TGA强调,将CFs掺入COPU基体可增强材料的热稳定性,允许它承受高达500°C的温度。这些发现强调了CFs作为延展性的潜力,轻量级,以及COPU基质生物复合材料中具有成本效益的增强,特别是工程应用。
The incorporation of natural lignocellulosic fibers as reinforcements in polymer composites has witnessed significant growth due to their biodegradability, cost-effectiveness, and mechanical properties. This study aims to evaluate castor-oil-based polyurethane (COPU), incorporating different contents of coconut coir fibers, 5, 10, and 15 wt%. The investigation includes analysis of the physical, mechanical, and microstructural properties of these composites. Additionally, this study evaluates the influence of hydrothermal treatment on the fibers, conducted at 120 °C and 98 kPa for 30 min, on the biocomposites\' properties. Both coir fibers (CFs) and hydrothermal-treated coir fibers (HTCFs) were subjected to comprehensive characterization, including lignocellulosic composition analysis, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The biocomposites were subjected to water absorption analysis, bending tests, XRD, SEM, FTIR, and TGA. The results indicate that the 30 min hydrothermal treatment reduces the extractive content, enhancing the interfacial adhesion between the fiber and the matrix, as evidenced by SEM. Notably, the composite containing 5 wt% CF exhibits a reduced water absorption, approaching the level observed in pure COPU. The inclusion of 15 wt% HTCF results in a remarkable improvement in the composite\'s flexural strength (100%), elastic modulus (98%), and toughness (280%) compared to neat COPU. TGA highlights that incorporating CFs into the COPU matrix enhances the material\'s thermal stability, allowing it to withstand temperatures of up to 500 °C. These findings underscore the potential of CFs as a ductile, lightweight, and cost-effective reinforcement in COPU matrix biocomposites, particularly for engineering applications.