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.

玻璃聚合物是一类新型聚合物，它将热塑性塑料的延展性与高度交联热固性塑料的非凡机械性能联合收割机结合在一起。Vitrimers的巨大优势在于，即使它们是交联的，即它们的分子状态远远超过结构渗透阈值，它们也可以被修复，重塑甚至回收。这是因为存在可转换的分子键。因此，Vitrimers不仅是可持续的，而且还可以实现加工技术的新视角，例如通过重复成型工艺，以及提高聚合物应用寿命和耐用性的机会。然而，从工程的角度来看，利用令人兴奋的玻璃体性质目前缺乏对潜在的物理和物理化学机制的理解。这在基于玻璃聚合物的复合材料的情况下甚至更重要，当额外的物理和化学相互作用开始发挥作用时，例如在纤维和玻璃聚合物基质之间。在这项研究计划中，Walter Benjamin计划的早期博士后和申请人旨在独立和自我协调，有助于更好地了解Vitrimers作为可持续聚合物和聚合物复合材料解决方案。这应通过系统研究和阐明导致延展性的过程来完成，首先是通过准静态和动态（包括动力学）热物理性质的方法，使用模型Vitrimer系统。因此，申请人专注于材料科学，工程和物理之间的跨学科研究。