Journal
MATERIALS TODAY-PROCEEDINGS
Volume 10, Issue -, Pages 385-392Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matpr.2019.03.001
Keywords
polypropylene; solar-thermal collector; chlorinated water; aging; mechanical properties
Categories
Funding
- Austrian Climate and Energy Fund (KLI.EN) within the program e!MISSION.at [SolPol-4/5]
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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 degrees 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. (C) 2019 Elsevier Ltd. All rights reserved.
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