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Deterioration of highly filled EPDM rubber by thermal ageing in air: Kinetics and non-destructive monitoring
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Chemistry.ORCID iD: 0000-0003-3049-7225
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Chemistry.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
2017 (English)In: Polymer testing, ISSN 0142-9418, E-ISSN 1873-2348, Vol. 64, p. 267-276Article in journal (Refereed) Published
Abstract [en]

The effects of air ageing at different temperatures between 110 and 170 degrees C on cable transit seals based on highly filled EPDM rubber used in nuclear power plants were studied. The changes of the macroscopic mechanical properties (Young's modulus, indentation modulus and strain-at-break) were in accordance with the Arrhenius equation with an activation energy of 110 kJ mol(-1). Profiling to assess the structure and property gradients within aged blocks was performed via IR spectroscopy, micro-indentation, gravimetric analysis of n-heptane-extracted samples and non-invasive portable NMR spectroscopy. A previously developed methodology was used to separate the deterioration into three different processes: polymer oxidation that was diffusion-limited at all temperatures, migration of low-molar-mass species to the surrounding media and anaerobic changes to the polymer network. The methodology allowed the assessment of the kinetics (rate as a function of time and temperature) of the different processes. It was noticed that polymer oxidation yielded more crosslinking at higher temperatures than at lower temperatures. The data obtained by both the portable NMR (a non-invasive method) and the indentation modulus profiling showed correlations with strain-at-break data, indicating their usefulness as condition monitoring methods.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2017. Vol. 64, p. 267-276
Keyword [en]
EPDM rubber, Air ageing, Structure and property profiling, Portable NMR, Deterioration mechanism separation, Condition monitoring
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-220844DOI: 10.1016/j.polymertesting.2017.10.019ISI: 000418221500032OAI: oai:DiVA.org:kth-220844DiVA, id: diva2:1172917
Note

QC 20180111

Available from: 2018-01-11 Created: 2018-01-11 Last updated: 2018-01-11Bibliographically approved

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Pourmand, PayamHedenqvist, Mikael S.Gedde, Ulf W

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