Malleability of highly cross-linked polymers – an investigation of the topology freezing phenomenon of Vitrimers via static and dynamic means and its relevance for the solution of technological challenges

高度交联聚合物的延展性——通过静态和动态方法研究 Vitrimers 的拓扑冻结现象及其与解决技术挑战的相关性

• 批准号: 521902629
• 负责人: Dr.-Ing. Andreas Klingler
• 金额: --
• 依托单位: Abteilung 2: Werkstoffwissenschaft
• 依托单位国家: 德国
• 项目类别: WBP Position
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/521902629?language=en
• 关键词: Malleability; highly; cross; linked; polymers

Vitrimers are a new class of polymers that combine the malleable character of thermoplastics with the extraordinary mechanical performances of highly cross-linked thermosets. The huge advantage of Vitrimers is, even though they are cross-linked, i.e. their molecular state being far beyond a structural percolation threshold, that they can be repaired, reshaped or even recycled. This is because of the presence of switchable molecular bonds. Hence, Vitrimers are not only sustainable, but also enable new perspectives on processing technologies, e.g. via repeated forming processes, as well as opportunities to enhance the lifetime and durability of polymer applications in service. However, from an engineering point of view, making use of the exciting Vitrimer properties currently lacks the understanding of the underlying physical and physio-chemical mechanisms. This is even more important in the case of Vitrimer-based composite materials, when additional physical and chemical interactions come into play, e.g. between fibres and a Vitrimer matrix. Within this research proposal, the early-stage postdoc and applicant to the Walter Benjamin programme aims to, independently and self-coordinated, contribute to a better understanding of Vitrimers as sustainable polymer and polymer composite solutions. This shall be done by a systematic investigation and elucidation of the processes that are responsible for the malleability, foremost by quasi-static and dynamic (including kinetic) means of thermo-physical properties, using a model Vitrimer system. Thereby, the applicant focusses on interdisciplinary research at the interface between materials science, engineering and physics.

玻璃二聚体是一类新的聚合物，可将热塑性塑料的可延展特性与高度交联热塞器的非凡机械性能结合在一起。玻璃二聚体的巨大优势是，即使它们是交联的，即它们的分子状态远远超出了结构性渗透阈值，也可以修复，重塑甚至回收。这是因为存在可切换的分子键。因此，玻璃二聚体不仅是可持续的，而且还可以使有关处理技术的新观点，例如通过重复形成的过程，以及增强服务中聚合物应用的寿命和耐用性的机会。但是，从工程学的角度来看，使用令人兴奋的玻璃二聚体特性缺乏对潜在的物理和生理化学机制的理解。在基于玻璃体的复合材料的情况下，当其他物理和化学相互作用发挥作用时，这一点更为重要，例如在纤维和玻璃体矩阵之间。在这项研究建议中，沃尔特·本杰明计划的早期博士后和申请人旨在独立和自我协调，有助于更好地理解玻璃二聚体作为可持续的聚合物和聚合物复合解决方案。这应通过系统的研究和阐明负责锻造性的过程进行，这是通过使用模型玻璃体系统的准静态和动态（包括动力学）手段（包括动力学）手段的最重要的。因此，申请人专注于材料科学，工程和物理学之间界面的跨学科研究。