This research aimed to evaluate the effect of retting (3 levels were concerned) and processing parameters (mainly temperature) on physico-chemical properties of flax-epoxy materials. 9 biobased composites were produced with 3 different processing programs: Setup 1, 2, and 3. An advanced organoleptic study has been carried out on both technical flax fibers and manufactured composites to study in more detail the effects of the processing and retting on the visual aspect. Organoleptic analysis shows that flax, as well as biobased composites, lose saturation and luminance by increasing retting time. Increasing the processing temperature alters the material color. According to SEM analysis, we highlight that the least retted fibers are presented in bundles that are well bonded and coated with each other to form a technical fiber. Depending on retting, technical fibers appear cleaner and more individualized but their mechanical properties are affected. An interesting approach has been applied for the determination of the volumic content of our biobased composites, using both TGA and pycnometer methods. On average, V_f decreases from 63.1 % for early retting (−) to 51.5 % for late retting (+). This effect could naturally result from the observed individualization of the fibers. Moreover, the porosity rates V_p increase overall with fiber content. On average it varies from 5 to 11 % in function of retting. Setup 3, with a processing temperature of 160 °C, a processing time of 130 min and a processing pressure of 50 bars, is the most desirable because it allows the highest V_f for the lowest V_p. Regarding the mechanical behavior of biobased composites, we have observed a non-elastic behavior of our stress-strain curves, due to the intrinsic behavior of flax fibers. Stress vs strain curves reveal 3 different areas for elastic and plastic transitions. It also appears that setup 3 provides the best modulus of elasticity compared to the other setups. We notice also that E1 Young’s modulus gradually increases with retting. By performing a normalization of E1 modulus according to the fiber volume, the effect of retting is even more pronounced. A 40 % increase in modulus can be observed between retting (−) and (+). At the end, the long retting level of technical flax fibers, as well as the third setup gives the best compromise for our bio based composite performances.

本研究旨在评估浸胶（涉及 3 个级别）和加工参数（主要是温度）对亚麻环氧树脂材料理化性能的影响。9 种生物基复合材料使用 3 种不同的加工程序生产：设置 1、2 和 3。对工业亚麻纤维和人造复合材料进行了高级感官研究，以更详细地研究加工和沤制对视觉效果的影响方面。感官分析表明，亚麻以及生物基复合材料会因浸渍时间增加而失去饱和度和亮度。提高加工温度会改变材料颜色。根据 SEM 分析，我们强调最少浸渍的纤维呈束状，这些纤维束粘合良好并相互涂覆以形成工业纤维。根据沤制，工业纤维看起来更干净、更个性化，但它们的机械性能会受到影响。使用 TGA 和比重瓶方法，一种有趣的方法已应用于确定我们的生物基复合材料的体积含量。平均而言，V_f从早期脱胶 (-) 的 63.1 % 下降到晚期脱胶 (+) 的 51.5 %。这种效果可能是由于观察到的纤维个体化而自然产生的。此外，孔隙率 V _p总体上随着纤维含量的增加而增加。平均而言，它在沤制功能上从 5% 到 11% 不等。设置 3 的处理温度为 160 °C，处理时间为 130 分钟，处理压力为 50 巴，这是最理想的，因为它允许最低 V _p的最高 V _f。关于生物基复合材料的机械行为，由于亚麻纤维的固有行为，我们观察到应力-应变曲线的非弹性行为。压力与应变曲线显示了弹性和塑性转变的 3 个不同区域。与其他设置相比，设置 3 似乎也提供了最佳的弹性模量。我们还注意到 E1 杨氏模量随着脱胶而逐渐增加。通过根据纤维体积对 E1 模量进行归一化，沤解的影响更加明显。在沤制 (-) 和 (+) 之间可以观察到模量增加了 40%。最后，工业亚麻纤维的长浸解水平以及第三种设置为我们的生物基复合材料性能提供了最佳折衷方案。