https://orcid.org/0000-0002-1012-7510
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ABSTRACT
Usage of natural fibers as reinforcing materials in composites has increased in recent years, due to their exceptional advantages like lightweight, low cost and biodegradable. To overcome the drawbacks in using the natural fibers due to the lack of bonding, higher moisture absorption and lower melting point, surface modification by alkali treatment on prosopis juliflora fibers with different weight concentrations of NaOH (5%, 10% and 15%) were carried out in the present work. These fibers have been used as reinforcements in an epoxy matrix. The outcomes of fiber alteration along with different weight proportions (10, 15, 20 and 25 wt%) of prosopis juliflora on the mechanical and water absorption properties were investigated. The outcomes of fiber-loading and alkali treatments on the aforementioned properties were investigated. The alkali behavior of fiber attained better results by improving the bond between the fiber surface and polymer matrix and also increased the fiber strength. The water absorption test showed that NaOH-treated fiber composites reveal a smaller amount of water absorption than untreated prosopis juliflora fiber-reinforced composites. The alkali conducts effect on the prosopis juliflora fibers have been distinguished by means of infrared spectroscopy (FTIR), thermo-gravimetric analysis (TGA) study and microscopy analysis (SEM).
摘要
近年来，由于天然纤维具有轻质、低成本、可生物降解等优点，在复合材料中作为增强材料的应用越来越多. 为克服天然纤维粘结性差、吸湿性高、熔点低等缺点，对不同质量浓度的NaOH（5%、10%和15%）的prosopis juliflora纤维进行了碱处理表面改性. 这些纤维被用作环氧树脂基体的增强材料. 研究了不同重量比（10、15、20和25wt%）的prosopis juliflora对纤维力学性能和吸水性能的影响. 研究了纤维负载和碱处理对上述性能的影响. 通过改善纤维表面与聚合物基体的结合，纤维的碱行为得到了较好的结果。采用红外光谱（FTIR）、热重分析（TGA）和显微分析（SEM）等方法，研究了碱对prosopis juliflora纤维导电性能的影响。与未处理的纤维复合材料相比，添加10%NaOH的20wt%纤维的拉伸强度、弯曲强度和冲击强度分别提高了59%、12%和13%. 与未经处理的纤维复合材料相比，经15%NaOH处理的纤维含量为20wt%时，吸水率降低了2.25%.