Flax is a prominent natural fiber used in biodegradable and sustainable polymeric biocomposites as reinforcement material. The prime objective of this research was to fabricate, characterize and compare flax-woven-fabric-reinforced poly(lactic acid) (PLA) and polypropylene (PP) with different directions (lengthwise and cross-wise) by using hot-press technology. Tensile strength, elastic modulus, flexural strength, flexural modulus, thickness swelling and water absorbency tests were carried out to assess the physical and mechanical performance of the composites. The flax/PLA composites exhibited the highest tensile strength (128.6 MPa) in the lengthwise direction, whereas flax/PP showed the lowest tensile strength in the cross-wise direction (90.69 MPa). Flax/PP had the highest flexural strength (53.80 MPa) in the lengthwise direction, although flax/PLA (lengthwise) provided the maximum bending modulus (40.809 MPa). Moreover, scanning electron micrographs were also investigated to observe the appearance of the matrix for flax/PLA and flax/PP composites before and after applying tensile loads. Fourier transform infrared spectroscopy analysis indicated successful lamination of flax woven fabrics with the thermoplastic polymers (PLA and PP). Thermogravimetric investigation showed enhanced thermal stability of the produced biocomposites.

中文翻译：

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亚麻织物增强聚乳酸和聚丙烯生物复合材料的热力学特性

亚麻是一种重要的天然纤维，用于可生物降解和可持续的聚合物生物复合材料中作为增强材料。本研究的主要目的是利用热压技术制造、表征和比较不同方向（纵向和横向）的亚麻织物增强聚乳酸（PLA）和聚丙烯（PP）。进行拉伸强度、弹性模量、弯曲强度、弯曲模量、厚度膨胀和吸水性测试以评估复合材料的物理和机械性能。亚麻/PLA复合材料在纵向上表现出最高的拉伸强度（128.6 MPa），而亚麻/PP在横向上表现出最低的拉伸强度（90.69 MPa）。亚麻/PP在纵向上具有最高的抗弯强度（53.80 MPa），尽管亚麻/PLA（纵向）提供了最大的弯曲模量（40.809 MPa）。此外，还研究了扫描电子显微照片，以观察亚麻/PLA 和亚麻/PP 复合材料在施加拉伸载荷之前和之后的基体外观。傅里叶变换红外光谱分析表明亚麻机织物与​​热塑性聚合物（PLA 和 PP）成功层压。热重研究表明所生产的生物复合材料的热稳定性增强。傅里叶变换红外光谱分析表明亚麻机织物与​​热塑性聚合物（PLA 和 PP）成功层压。热重研究表明所生产的生物复合材料的热稳定性增强。傅里叶变换红外光谱分析表明亚麻机织物与​​热塑性聚合物（PLA 和 PP）成功层压。热重研究表明所生产的生物复合材料的热稳定性增强。