Profiling of thermally aged EPDM seals using portable NMR, indenter measurements and IR spectroscopy facilitating separation of different deterioration mechanisms
| Autor: | Payam Pourmand, Ulf W. Gedde, Erik Linde, Mikael S. Hedenqvist, Sergey V. Dvinskikh, István Furó |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Polymers and Plastics Spectrometer Infrared Organic Chemistry Analytical chemistry Infrared spectroscopy Modulus 02 engineering and technology Ethylene propylene rubber 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Thermal ageing 0210 nano-technology Spectroscopy Mass fraction |
| Zdroj: | Polymer Testing. 53:77-84 |
| ISSN: | 0142-9418 |
| Popis: | The changes occurring in EPDM cable transit seals during thermal ageing and the causes of these changes were investigated. Samples were aged at a temperature of 170 °C, and subsequently evaluated with respect to the distance from the surface with modulus profiling, infrared (IR) spectroscopy and nuclear magnetic resonance (NMR) spectroscopy, based on the extractable mass fraction profiles for initial and aged materials. The ageing resulted in an increase in the modulus and in the degree of oxidation and in a decrease in the NMR transverse relaxation time, T2. The NMR data were obtained in a non-invasive manner by ex situ experiments performed with a portable low-field spectrometer (NMR MOUSE). The results showed deterioration processes that can be attributed to different mechanisms i.e. oxidation, anaerobic crosslinking and migration of oil extender. The unique combination of parameter profiles made it possible to resolve and quantify these three contributing mechanisms. The NMR results highlight the potential of this method for on-site testing. |
| Databáze: | OpenAIRE |
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