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ALKALI TREATMENT ON SUGARCANE BAGASSE TO IMPROVE PROPERTIES OF GREEN COMPOSITES OF SUGARCANE BAGASSE FIBERS-POLYPROPYLENE

机译:碱法处理甘蔗渣提高甘蔗渣纤维 - 聚丙烯绿色复合材料的性能

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摘要

This work evaluated the improved performance of sugarcane bagasse fibers-polypropylene (PP) composites as a result of alkali treatment done on sugarcane bagasse as reinforcing fibers. Alkali solution of 10 NaOH with a temperature of 60-70oC was used to soak the bagasse for 2 to 6 hours. Hot pressed samples were prepared from a mixture of sugarcane bagasse fibers and PP with fibers/PP weight ratios of 20/80, 25/75, and 30/70. Hot pressed samples using untreated bagasse fibers were also produced for a comparison. Tensile test was performed to all samples and the fracture surface from tensile test samples were observed using scanning electron microscopy (SEM) to study how the presence of reinforcement in PP matrix and its alkali treatment influenced the strengthening and failure characteristics of the composites. The alkali treatment carried out resulted in a relevant increase of tensile strength of the composite to 229,29 MPa at 20/80 fibers/PP weight ratio or an increase of 43 comparing to the composite samples which their fibers were untreated with alkali. The tensile strength of the composite with a 25/75 fibers/PP weight ratio increased to 290,30 MPa and decreased to 214,17 MPa as the fibers/PP weight ratio increased to 30/70. Microstructural study using SEM showed a different outlook on the fiber#8223s surface after alkali treatment which the treatment caused the elimination of the impurities, waxy materials, lignin as well as hemicellulose, which was responsible for an easy deformation of the cellular networks. Alkali treated-sugarcane bagasse gave the best reinforcement for composites after 2 hours of treatment which resulted in the excellent fiber-resin bonding.
机译:这项工作评估了甘蔗渣纤维-聚丙烯(PP)复合材料在甘蔗渣作为增强纤维上进行碱处理后的性能提高。用温度为60-70oC的10 NaOH碱溶液将甘蔗渣浸泡2至6个小时。由甘蔗渣纤维和PP /纤维/ PP重量比为20 / 80、25 / 75和30/70的混合物制备热压样品。还生产了使用未经处理的蔗渣纤维的热压样品,以进行比较。使用扫描电子显微镜(SEM)对所有样品进行拉伸测试,并观察拉伸测试样品的断裂表面,以研究PP基体中增强材料的存在及其碱处理如何影响复合材料的增强和破坏特性。与未用碱处理纤维的复合材料样品相比,进行了碱处理使复合材料在20/80纤维/ PP重量比下的抗拉强度显着提高到229.29 MPa,或增加了43。随着纤维/ PP重量比增加到30/70,具有25/75纤维/ PP重量比的复合材料的拉伸强度增加到290.30MPa,并且降低到214.17MPa。使用SEM进行的微结构研究表明,碱处理后的#8223纤维表面具有不同的外观,该处理导​​致杂质,蜡质材料,木质素和半纤维素的清除,这使细胞网络易于变形。碱处理的蔗糖蔗渣在处理2小时后为复合材料提供了最佳的增强效果,从而获得了优异的纤维-树脂粘合性。

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