Poly (lactic acid) (PLA)-based biocomposites containing flax fiber (FF) and basalt fiber (BF) both separately and together were prepared by melt blending method at the total constant ratio of 30 wt%. Mechanical properties, thermo-mechanical characteristics, thermal stability, flow behaviors, water uptake, and morphology of composites were investigated by tensile, hardness and impact tests, dynamic mechanical analysis (DMA), thermal gravimetric analysis, melt flow index (MFI) test, water absorption, and scanning electron microscopy, respectively. Mechanical test results show that tensile strength, elongation, elastic modulus, and impact strength are extended up to higher values with increase in BF content in hybrid composites. Conversely, the presence of FF displays a negative effect in which these values drop down drastically as the FF concentration increases. On the other hand, slightly higher hardness values are obtained by the addition of FF at higher loadings. DMA analysis reveals that BF inclusion leads glass transition temperature of PLA to one point higher, but hybrid and FF containing composites shift that temperature to lower values. Storage moduli of composites are enhanced with the increase in BF concentration and remarkable decreases are observed for FF-filled composites. Hybrid composites exhibit average MFI values between PLA/FF and PLA/BF composites.

中文翻译：

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玄武岩纤维和亚麻纤维混合填充聚乳酸基生物复合材料的制备和表征

分别含有亚麻纤维（FF）和玄武岩纤维（BF）的聚乳酸（PLA）基生物复合材料通过熔融共混方法以30wt％的总恒定比例制备。通过拉伸、硬度和冲击试验、动态力学分析 (DMA)、热重分析、熔体流动指数 (MFI) 测试，研究了复合材料的机械性能、热机械特性、热稳定性、流动行为、吸水率和形貌。分别是吸水率和扫描电子显微镜。力学测试结果表明，随着混合复合材料中BF含量的增加，拉伸强度、伸长率、弹性模量和冲击强度都扩展到更高的值。反过来，FF 的存在显示出负面影响，其中这些值随着 FF 浓度的增加而急剧下降。另一方面，通过在较高负载下添加 FF 可获得略高的硬度值。DMA 分析表明，BF 夹杂物导致 PLA 的玻璃化转变温度升高一个点，但混合和含有 FF 的复合材料使该温度降低到较低的值。复合材料的储能模量随着 BF 浓度的增加而增强，FF 填充复合材料的储能模量显着降低。混合复合材料在 PLA/FF 和 PLA/BF 复合材料之间表现出平均 MFI 值。但是混合和含有 FF 的复合材料将该温度转移到较低的值。复合材料的储能模量随着 BF 浓度的增加而增强，FF 填充复合材料的储能模量显着降低。混合复合材料在 PLA/FF 和 PLA/BF 复合材料之间表现出平均 MFI 值。但是混合和含有 FF 的复合材料将该温度转移到较低的值。复合材料的储能模量随着 BF 浓度的增加而增强，FF 填充复合材料的储能模量显着降低。混合复合材料在 PLA/FF 和 PLA/BF 复合材料之间表现出平均 MFI 值。