Baseline investigations of strength mechanism of hybrid material welds

混合材料焊缝强度机制的基线研究

• 批准号: 230501039
• 负责人: Professor Dr.-Ing. Michael Gehde (†)
• 金额: --
• 依托单位: Professur Kunststoffe
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/230501039?language=en
• 关键词: Baseline; investigations; strength; mechanism; hybrid

Hybrid materials, so-called polymer blends, are produced to combine the advantages of the basic materials, to enforce them through synergies or to adjust certain properties of the compound. Miscibility of different polymers is only known for very few composite materials. In case of incompatible polymers physical or chemical compatibilizers can be used to achieve certain miscibility in the boundary layer between the components. The aim of the research project is to weld polyolefins and polyamide together and to understand the mechanism of strength behind. The two sorts of polymer are incompatible as raw materials and therefore do not develop sufficient mechanical properties during the welding process for technical applications. To change the condition of immiscibility in a positive way the material of one joining partner is chemically modified in a previous moulding process. Thereby maleic anhydride as compatibilizer is bounded to the macromolecules of the polyolefins by reactive extrusion. The compatibilizer allows a limited miscibility of the different polymers in addition. The reactive blends are welded to a joining partner of non-modified polymer and the process parameters are varied concerning optimal mechanical properties. The research work covers hot plate welding and vibration welding processes. The choice of the welding processes is based on the fundamental differences in heat transfer and in rheological conditions during the joining phase. In hot plate welding the joining area is melted by heat conduction and the two joining partners are joined afterwards. In vibration welding process the two phases of heating by friction und joining take place at the same time. Thereby it exists the potential that different conditions of blending can be found in the joining layer. Mechanical and physical material properties of the compounds and the welds as well will be characterized with state-of-the-art analytical procedures to investigate the strength mechanisms and the morphology. With broad understanding of the mode of action by the investigated hybrid material welds it is possible to transfer the results to other material combinations.

生产的杂种材料（所谓的聚合物混合物）是为了结合基本材料的优势，通过协同作用或调整化合物的某些特性。不同聚合物的混杂性仅以很少的复合材料而闻名。如果有不相容的聚合物，则可以使用物理或化学兼容器来在组件之间的边界层中实现某些混标性。研究项目的目的是将聚烯烃和聚酰胺焊接在一起，并了解背后的强度机理。两种聚合物作为原材料不兼容，因此在技术应用的焊接过程中没有足够的机械性能。为了以积极的方式改变不混溶的状况，一个联合伙伴的材料在先前的成型过程中进行了化学修改。从而通过反应性挤出将马来甲基甲基甲基化合物作为兼容剂界定到聚烯烃的大分子。兼容剂还允许不同聚合物的混溶性有限。反应性混合物被焊接到非修饰聚合物的连接伙伴，并且过程参数与最佳的机械性能有关。研究工作涵盖了热板焊接和振动焊接工艺。焊接过程的选择是基于加入阶段中传热和流变条件下的基本差异。在热板焊接中，连接区域被热传导融化，然后将两个联合伙伴加入。在振动焊接过程中，摩擦和连接加热的两个阶段是同时进行的。因此，它具有在联接层中可以找到不同混合条件的潜力。化合物和焊缝的机械和物理材料特性也将以最新的分析程序来表征，以研究强度机理和形态。通过广泛了解所研究的杂交材料焊接的作用方式，可以将结果转移到其他材料组合中。