https://orcid.org/0000-0002-0979-5001
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ABSTRACT
Construction industries demand a material with high strength to endure severe environmental conditions like high temperature and humid and hence, it is noteworthy to assess the thermal and water transport properties of the material. In this investigation, the natural fibers based composites were fabricated using Indian almond and kenaf fibers by hand layup method. Entirely, two natural fiber composites viz. epoxy/Indian almond & epoxy/kenaf and two hybrid composites viz. kenaf/India almond/kenaf (K/I/K) & Indian almond/kenaf/Indian almond (I/K/I) were prepared. Thermogravimetric analysis (TGA) was carried out to analyze the thermal properties and water absorption study was carried out to analyze the transport properties. TGA study showed that the epoxy/kenaf composite exhibited a maximum onset temperature of 340.49°C owing to good bonding strength and the K/I/K composite displayed a maximum decomposition temperature of 380.21 ° with a minimum mass loss of 1.29 mg/min. Further, the epoxy/Indian almond composite showed a better flame retardancy property due to more char formation. Water absorption study resulted that the epoxy/Indian almond composite absorbed more water (35% at 50°C) compared to other composites due to spongy like structure and the presence of more voids on the surface of the fiber. Further, the epoxy/kenaf composite displayed more resistance to water penetration with maximum activation energy of diffusion of 2.63 kJ/mole. Transport properties such as diffusion coefficient, sorption coefficient and permeability coefficient were varied in line with temperature. The epoxy/kenaf composite showed least diffusion coefficient of 2.48 × 10−5 cm2/s, sorption coefficient of 1.05, and permeability coefficient of 2.61 × 10−5 cm2/s at 30°C among all other composites due to good bonding strength.
摘要
建筑业需要高强度的材料来承受恶劣的环境条件，如高温和潮湿，因此，评估材料的热性能和水传输性能是值得注意的. 本研究以印度杏仁和红麻纤维为原料，采用手糊法，制备天然纤维基复合材料. 两种天然纤维复合材料，即. 环氧树脂/印度杏仁和环氧树脂/红麻和两种混杂复合材料，即. 制备了红麻/印度杏仁/红麻（K/I/K）和印度杏仁/红麻/印度杏仁（I/K/I）. 通过热重分析（TGA）对其热性能进行了分析，通过吸水率研究了其输运性能. TGA研究表明，环氧树脂/红麻复合材料具有良好的结合强度，其最大起始温度为340.49℃，K/I/K复合材料的最大分解温度为380.21℃，最小质量损失为1.29mg/min. 此外，环氧树脂/印度杏仁复合材料显示出更好的阻燃性能，因为更多的碳形成. 吸水性研究表明，与其他复合材料相比，环氧树脂/印度杏仁复合材料吸收更多的水（50°C时为35%），这是由于纤维表面具有海绵状结构和更多的空隙. 此外环氧树脂/红麻复合材料表现出更强的抗水渗透性，最大扩散活化能为2.63kj/摩尔. 扩散系数吸附系数和渗透系数等输运性质随温度的变化而变化. 在30℃时，环氧树脂/红麻复合材料的扩散系数最小，为2.48×10-5cm2/s，吸附系数为1.05，渗透系数为2.61×10-5cm2/s.