Study of the temperature-dependent stress-cracking behavior of amorphous polymer-based nanocomposites

在塑料的日常使用中，高分子材料的环境应力开裂是一个严重的问题。ESC是塑料部件中最常见的失效原因；大约25%的失败案例归因于这种现象。如果部件还与作为环境应力开裂剂的液体接触，则ESC发生在远低于材料屈服强度或机械强度的应力水平下。在某些应用中，例如在医学中，这可能会导致危及生命的情况。纳米级颗粒的加入对热塑性塑料的性能有积极的影响。最近的研究表明，在聚合物基体中加入纳米颗粒可以极大地降低这些材料的蠕变倾向。这是由于纳米颗粒引起的分子迁移率的限制。类似地，纳米颗粒可能会对环境应力开裂行为产生影响。事实上，与项目相关的初步工作基本上表明，由于这种措施，应力开裂导致的材料失效可以转移到更高的失效时间。该项目的目的是系统地探索这种潜力。在实验的基础上，力求利用混合料的叠加原理和规律进行建模和仿真。

Environmental Stress Cracking ESC of polymer materials is a serious issue in the daily use of plastics. ESC is the most common reason of failure in plastic components; around 25% of the failure cases are attributed to this phenomenon. ESC occurs at stress levels well below the yield strength or mechanical strength of the material if the part is also in contact with a liquid acting as an environmental stress cracking agent. In certain applications, such as in medicine, this can lead to life-threatening situations.The addition of the nanoscale particles in thermoplastics can affect the properties of the material positive. It was shown in the recent past that the incorporation of nanoparticles in polymeric matrices can extremely reduce the creep tendency of these materials. This is attributed to a limitation in the molecular mobility caused by the nanoparticles. In analogy is likely that nanoparticles can have an effect on the environmental stress cracking behavior. In fact, project-related preliminary work has shown basically that materials failure as a result of stress cracking can be shifted to higher failure times due to this measure. The aim of the project is to systematically explore this potential. Beside the experiment modeling and simulation by using superposition principles and rules of mixtures is strived for.