Polymeric materials used in solar-thermal applications are exposed to superimposed mechanical (e.g., system pressure) and environmental (e.g., temperature and environmental medium) loads. The environmental loading induced degradation of the polymers leads to diminished mechanical properties and to the reduction of the product lifetime. This paper describes the characterization of the mechanical behavior (i.e., strain-at-break and essential work of fracture) of four different polypropylene (PP) grades immersed for up to 750 h in chlorinated water (5 ppm chlorine content) at 60°C. The strain-at-break values exhibited a similar exposure time dependence as the essential work of fracture values. Depending on the PP grade, time-to-embrittlement values of 375 h and 750 h were obtained. For the three different stabilized PP grades, both testing methods led to an equal time-to-embrittlement value of 750 h.
|Original language||English (US)|
|Number of pages||8|
|Journal||Materials Today: Proceedings|
|State||Published - 2019|
|Event||2017 International Conference on Advanced Energy Materials, AEM 2017 - Surrey, United Kingdom|
Duration: Sep 11 2017 → Sep 13 2017
Bibliographical noteFunding Information:
This research work was performed in the cooperative research project SolPol-4/5 entitled ?Solar-thermal systems based on polymeric materials? (www.solpol.at). The project SolPol-4/5 is funded by the Austrian Climate and Energy Fund (KLI.EN) within the program "e!MISSION.at" and the funding is administrated by the Austrian Research Promotion Agency (FFG).
- Chlorinated water
- Mechanical properties
- Solar-thermal collector