In this paper, oil palm fiber (OPF) and pineapple fiber (PALF) reinforced biophenolic resin (BPHR) composites and hybrid composites were fabricated by hand lay-up technique. Structural, thermal and mechanical properties of pure and hybrid composites analyzed by Fourier transform infrared (FTIR), thermal gravimetric analyzer (TGA), dynamic mechanical analyzer (DMA), and universal testing machine. Achieved results indicated that OPF/PALF hybrid composites show better properties as compared with pure composites. It was observed that the tensile and flexural characterizations improved with incorporating OPF and PALF fibers into BPHR composites in comparison to the neat BPHR matrix. The results of the thermal stability obtained from TGA tests showed that the reinforcement of pure fiber composites (OPF and PALF) and hybrid composites (OPF/PALF) in BPHR matrix were improved in comparison to that of neat BPHR matrix. The final decomposition temperature of 50% OPF and 3OPF/7PALF was the highest among all other composites (415.80 and 415.42°C). On the other hand, the residual amount of hybrid composite (1OPF/1PALF) was (24.43%), while the lowest residual amount exhibited in pure composite (50% PALF), which was 20.08%. The reinforcement of pure composite and hybrid composites into BPHR also improved the storage and loss moduli; however, the pure composite sample (50% OPF) exhibited a more significant increase than other composites loadings. Furthermore, the damping factor was reduced significantly by the reinforcement of hybrid composites over pure composites. This study showed that obtained hybrid composites are suitable to apply in various structural and nonstructural applications.

中文翻译：

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油棕纤维/菠萝纤维增强酚醛杂化复合材料的化学、机械和热性能比较评价

在本文中，油棕纤维（OPF）和菠萝纤维（PALF）增强生物酚醛树脂（BPHR）复合材料和混合复合材料是通过手糊技术制造的。通过傅里叶变换红外 (FTIR)、热重分析仪 (TGA)、动态力学分析仪 (DMA) 和万能试验机分析纯复合材料和混合复合材料的结构、热和机械性能。获得的结果表明，与纯复合材料相比，OPF/PALF 混合复合材料显示出更好的性能。据观察，与纯 BPHR 基体相比，将 OPF 和 PALF 纤维加入 BPHR 复合材料后，拉伸和弯曲特性得到改善。从 TGA 测试获得的热稳定性结果表明，与纯 BPHR 基体相比，BPHR 基体中的纯纤维复合材料（OPF 和 PALF）和混合复合材料（OPF/PALF）的增强作用有所提高。50% OPF 和 3OPF/7PALF 的最终分解温度是所有其他复合材料中最高的（415.80 和 415.42°C）。另一方面，杂化复合材料 (1OPF/1PALF) 的残留量为 (24.43%)，而纯复合材料 (50% PALF) 的残留量为 20.08%。将纯复合材料和混合复合材料增强到 BPHR 中也提高了存储和损耗模量；然而，纯复合材料样品 (50% OPF) 表现出比其他复合材料负载更显着的增加。此外，与纯复合材料相比，混合复合材料的增强显着降低了阻尼系数。该研究表明，获得的混合复合材料适用于各种结构和非结构应用。