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

非晶聚合物基纳米复合材料随温度变化的应力开裂行为研究

基本信息

批准号：
270466437
负责人：
Professor Dr.-Ing. Alois K. Schlarb
金额：
--
依托单位：
Lehrstuhl für Verbundwerkstoffe (CCE)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/270466437?language=en
关键词：
Study temperature dependent stress cracking

项目摘要

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.

聚合物材料的环境应力开裂是塑料日常使用中的一个严重问题。ESC是塑料部件最常见的失效原因；大约25%的失效案例可归因于这种现象。如果零件还与充当环境应力裂解剂的液体接触，则ESC发生在远低于材料屈服强度或机械强度的应力水平。在某些应用中，例如在医学上，这可能会导致生命危险的情况。在热塑性塑料中添加纳米粒子会对材料的性能产生积极的影响。最近的研究表明，在聚合物基质中加入纳米颗粒可以极大地降低这些材料的蠕变倾向。这归因于纳米粒子对分子迁移率的限制。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，与项目相关的前期工作已经基本表明，由于这一措施，材料由于应力开裂而失效的次数可以转移到更高的失效次数。该项目的目的是系统地探索这一潜力。此外，还利用混合物的叠加原理和规律进行了实验建模和仿真。