https://orcid.org/0000-0002-1417-3186
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ABSTRACT
Three different pre-treatment methods, that is, alkali hornification, water hornification, and alkali treatment, are evaluated for the improvement in durability of agave natural fiber-reinforced polymer composites under the hygrothermal aging conditions. The composite specimens were prepared following the standard test procedures laid for moisture diffusion analysis. To analyze the effect of different treatment conditions, the standard test specimens were subjected to different hygrothermal aging conditions in the accelerated environments. After four subsequent hornification cycles, the alkali hornification resulted in about 27% lower water retention value in the agave fibers. Under similar conditions, water hornification leads to a meager 6% loss of water retention. Under the direct exposure to water, the alkali-hornified composites had a mass gain of 4.1%, 4.3%, and 4.7%, respectively, at 25°C, 50°C, and 75°C. The mass gain of alkali-treated composites was 4.3%, 4.5%, and 5.1%. and water hornification resulted in a mass gain of 5.5%, 5.9%, and 6.1% at similar temperatures. Under the humidity conditions, the alkali-hornified composites had a mass gain of 0.9%, 1.3%, and 1.1%, respectively, at 25°C, 50°C, and 75°C. The mass gain of alkali-treated composites was 0.6%, 1.05%, and 1.2%. and water hornification resulted in the mass gain of 0.66%, 1.07%, and 1.3% at similar temperatures. The present study reveals the influence of fiber pre-treatment methods on moisture durability of agave natural fiber composites. The results are further supported through microstructural investigations.
摨要
本文研究了原丝相思纤维和碱化金合欢纤维（ACF）的基本性能（直径、密度、化学成分、结晶性质、热性能、拉伸性能和表面形貌），并对其作为绿色复合材料增强体的适宜性进行了验证. 化学分析结果表明，5%（w/v）NaoH处理45min后，化学成分的变化比其他处理时间（15、30、60、75 min）要乐观. 通过傅立叶变换红外光谱（FTIR）和核磁共振（NMR）谱图，确定了碱化活性炭纤维中木质素和半纤维素含量的降低. X射线衍射（XRD）分析表明，最佳碱化ACF的结晶参数（结晶度指数27.5%～35.6%）和晶粒度（4.17nm～6.43nm）有所改善. 在热分析仪的帮助下，生成了未处理和最佳碱化活性炭纤维的质量降解模式（TG和DTG曲线）. 用扫描电镜和原子力显微镜观察碱化对活性炭纤维表面形貌的影响.