Hirsch Patrick, Tillner Benjamin, Henkel André, Teuscher Nico, Jahn Ivonne, Feldmann Maik
Fraunhofer Institute for Microstructure of Materials and Systems IMWS, Walter-Hülse-Straße 1, 06120 Halle (Saale), Germany.
Polymers (Basel). 2025 Feb 28;17(5):666. doi: 10.3390/polym17050666.
Within this study, the impregnation behavior and resulting mechanical properties of unidirectional flax fiber-reinforced polyamide 11 biocomposites were investigated. Therefore, different grades of bio-based polyamide 11 have been evaluated regarding their eligibility as composite matrix material. The production of the unidirectional flax fiber-reinforced biocomposites was investigated using a continuous film-stacking method. It was found that the flow behavior of the polyamide 11 matrix polymer significantly affected the impregnation quality and the resulting mechanical properties as tested by tensile and bending tests. A lower shear viscosity and stronger shear thinning behavior led to better impregnation, a 15% higher stiffness, and 18% higher strength. This was also analyzed with morphological analysis by scanning electron microscopy. Additionally, the effect of the fiber volume content of the flax fibers on the mechanical properties was tested, showing a positive correlation between the fiber content and the resulting stiffness and strength, leading to an increase of 48% and 55%, respectively. In result, a maximum Young's modulus of 16.9 GPa and tensile strength of 175 MPa at a fiber volume content of 33% was achieved. Thus, the unidirectional flax fiber-reinforced polyamide 11 biocomposites investigated can be a sustainable construction material for lightweight applications, e.g., in the automotive industry.
在本研究中，对单向亚麻纤维增强聚酰胺11生物复合材料的浸渍行为及由此产生的力学性能进行了研究。因此，对不同等级的生物基聚酰胺11作为复合基体材料的适用性进行了评估。采用连续薄膜堆叠法研究了单向亚麻纤维增强生物复合材料的生产过程。结果发现，聚酰胺11基体聚合物的流动行为对浸渍质量以及通过拉伸和弯曲试验测试的力学性能有显著影响。较低的剪切粘度和较强的剪切变稀行为导致更好的浸渍效果、刚度提高15%、强度提高18%。还通过扫描电子显微镜进行形态分析对此进行了分析。此外，测试了亚麻纤维的纤维体积含量对力学性能的影响，结果表明纤维含量与由此产生的刚度和强度之间呈正相关，分别导致刚度和强度提高48%和55%。结果，在纤维体积含量为33%时，实现了16.9 GPa的最大杨氏模量和175 MPa的拉伸强度。因此，所研究的单向亚麻纤维增强聚酰胺11生物复合材料可以成为用于轻质应用（如汽车工业）的可持续建筑材料。
