The use of sustainable hybrid components is an important topic in lightweight automotive applications. Wood being a renewable material, when used in combination with other materials such as technical polymers, offers a high potential for producing hybrid components and the implementation of innovative lightweight automotive materials. The feasibility of wood-based hybrid automotive components strongly depends on the properties of the interface between wood, lignin as a renewable coupling agent, and technical polymers. This paper investigates the macromolecular reactions and the bonding area in biobased epoxy adhesives for a specific influence on the performance of structural automotive wood components. Therefore, a typical bisphenol A diglycidyl ether epoxy adhesive was modified with lignosulphonate to increase the penetration depth. The composites were characterized by thermogravimetric analysis coupled with Fourier-transform infrared spectroscopy to validate the crosslinking of the macromolecules and the thermal stability of the adhesive. In the next step, a layer-by-layer composite was built up with the biobased adhesive and 1 mm beech veneer. The bonding area was characterized by scanning electron microscopy and compression tests.

中文翻译：

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木质素环氧树脂粘合剂在汽车部件结构木材应用中的粘合性能评估

可持续混合动力部件的使用是轻量化汽车应用中的一个重要课题。木材是一种可再生材料，当与其他材料（如技术聚合物）结合使用时，为生产混合组件和实施创新的轻量化汽车材料提供了巨大的潜力。木质混合动力汽车部件的可行性在很大程度上取决于木材、作为可再生偶联剂的木质素和技术聚合物之间的界面特性。本文研究了生物基环氧粘合剂中的大分子反应和粘合面积对汽车结构木部件性能的具体影响。因此，典型的双酚 A 二缩水甘油醚环氧粘合剂用木质素磺酸盐改性以增加渗透深度。通过热重分析结合傅里叶变换红外光谱对复合材料进行表征，以验证大分子的交联和粘合剂的热稳定性。在下一步中，使用生物基粘合剂和 1 毫米山毛榉木贴面构建了一层层的复合材料。通过扫描电子显微镜和压缩测试表征粘合区域。