The correlation between elongation at break and thermal decomposition of aged EPDM cable polymer

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Authors

Institutes & Expert groups

  • UCL - Université catholique de Louvain
  • SCK•CEN - Studiecentrum voor Kernenergie/Centre d’Etude de l’Energie Nucléaire

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DOI

Abstract

The effect of simultaneous thermal and gamma irradiation ageing on the mechanical and physicochemical properties of industrial EPDM was investigated. Accelerated ageing, covering a wide range of dose rates, doses and temperatures, was preformed in stagnant air on EPDM polymer samples extracted from the cables in use in the Belgian nuclear power plants. The mechanical properties, ultimate tensile stress and elongation at break, are found to exhibit the strong dependence on the dose, ageing temperature and dose rate. The thermal decomposition of aged polymer is observed to be the dose dependent when thermogravimetry test is performed under air atmosphere. No dose dependence is observed when thermal decomposition is performed under nitrogen atmosphere. The thermal decomposition rates are found to fully mimic the reduction of elongation at break for all dose rates and ageing temperatures. This effect is argued to be the result of thermal and radiation mediated oxidation degradation process.

Details

Original languageEnglish
Pages (from-to)8-12
Number of pages5
JournalRadiation Physics and Chemistry
Volume132
DOIs
StatePublished - 12 Oct 2016

Keywords

  • EPDM, Thermogravimetry, Ageing, Gamma irradiation; , Mechanical properties;

ID: 5528541