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Development and assessment of Moringa oleifera (Sahajana) leaves filler/epoxy composites: Characterization, barrier properties and in situ determination of activation energy
Polymer Composites ( IF 4.8 ) Pub Date : 2020-08-25 , DOI: 10.1002/pc.25771
Kajal Mishra 1 , Shishir Sinha 1
Affiliation  

This study concerns with investigation and analysis of hugely available, cost effective filler, obtained by grinding the Moringa oleifera leaves and its reinforcement in epoxy composites for semi‐structural applications. In this work, this novel filler is characterized by compositional analysis, FTIR, AFM, SEM, XRD, and TGA, along with the calculation of activation energy from two integral methods. To understand the interfacial surface chemistry of the fiber, X‐ray photoelectron spectroscopy (XPS) is also carried out. The size of filler was kept at 300 to 500 μm, and composites were prepared with five different loadings ranging from 5% to 25% using hand layup method of fabrication. The effect of varying loadings of filler on water uptake, mechanical, morphological, and thermal properties of its epoxy composites has been evaluated. Composites possess improved water resistance, tensile and flexural strengths in comparison with neat epoxy for an optimum loading of 20%, that is, 37 MPa. FWO and KAS methods are used to calculate the apparent activation energy of fillers. The apparent activation energy calculated from these methods comes to be 220 and 222 kJ/mol. The crystallinity index comes to be 55% which is comparable with other fibers. Approximately 12% increment in tensile strength and 10% in flexural strength takes place compared with neat epoxy at optimum fiber loading of 20%.

中文翻译:

辣木(Sahajana)叶片填料/环氧复合材料的开发和评估:表征,阻隔性能和活化能的原位测定

这项研究涉及通过研磨辣木获得的大量可用的,具有成本效益的填料的调查和分析。叶片及其在半结构应用的环氧复合材料中的增强作用。在这项工作中,这种新型填料的特征在于成分分析,FTIR,AFM,SEM,XRD和TGA,以及通过两种积分方法计算活化能。为了了解纤维的界面表面化学性质,还进行了X射线光电子能谱(XPS)。填料的尺寸保持在300至500μm,并使用手工铺层法制备了5种不同载荷的复合材料,其载荷范围为5%至25%。已经评估了不同填充量对其环氧复合材料的吸水率,机械,形态和热性能的影响。与纯环氧树脂相比,复合材料具有更好的耐水性,拉伸强度和挠曲强度,最佳负载量为20%,即37 MPa。FWO和KAS方法用于计算填料的表观活化能。通过这些方法计算出的表观活化能为220和222 kJ / mol。结晶度指数为55%,与其他纤维相当。在最佳纤维负载量为20%的情况下,与纯环氧树脂相比,抗张强度增加了约12%,抗弯强度增加了10%。
更新日期:2020-08-25
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