Limits in the validity of Arrhenius predictions for field ageing of a silica filled polychloroprene in a marine environment

Type Article
Date 2014-01
Language English
Author(s) Le Saux V.1, Le Gac Pierre-YvesORCID2, Marco Y.1, Calloch S.1
Affiliation(s) 1 : UBO ENIB, ENSTA Bretagne, Lab Brestois Mecan & Syst EA 4325, F-29806 Brest 9, France.
2 : IFREMER, Ctr Brest, Marine Struct Lab, F-29280 Plouzane, France.
Source Polymer Degradation And Stability (0141-3910) (Elsevier Sci Ltd), 2014-01 , Vol. 99 , P. 254-261
DOI 10.1016/j.polymdegradstab.2013.10.027
WOS© Times Cited 24
Keyword(s) Polychloroprene rubber, Accelerated and natural ageing tests, Arrhenius extrapolation, Lifetime prediction, Sea water
Abstract Accelerated ageing in natural sea water at different temperatures from 20°C to 80°C was performed on a silica filled polychloroprene rubber. Degradation when monitored with mechanical properties at both macroscopic and microscopic scale led to a large increase of the modulus coupled with a strong decrease of strain and stress at break. Data from tensile tests were used for lifetime prediction with an Arrhenius extrapolation for modulus, strain and stress at break. The validity of this lifetime prediction was evaluated using a 23 year-old sample aged in natural conditions. Strain at break could be predicted using an Arrhenius extrapolation with an activation energy of 50 kJ/mol. However, an extrapolation based on linear Arrhenius behavior did not apply for modulus and stress at break due to the presence of a degradation profile across the sample. These observations confirmed that strain at break is not governed by bulk properties of samples but by the degradation rate at the external surface of the sample (i.e. in contact with water).
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