Investigation and modelling of the water transport properties in unfilled EPDM elastomers
Type
Articles dans des revues avec comité de lectureAuthor

764 Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces [LEPMI ]
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
528389 EDF R&D [EDF R&D]
Date
2019Journal
Polymer Degradation and StabilityAbstract
The water sorption properties (i.e. diffusivity and solubility) of three unfilled vulcanized EPDMs were investigated in wet atmosphere (typically between 0 and 95% RH) and in pure distilled water (denoted as 100% RH) at 70 °C with an IGAsorp dynamic sorption analyzer. In the 0–0.5 activity range, all EPDMs obey to the usual Fick and Henry's laws. In contrast, at activities higher than 0.5, the water sorption behavior of all EPDMs deviates from these two laws because of the formation of water clusters. Park's equation was used for simulating accurately the sorption isotherms and thus, accessing Henry's constant and the average size of water clusters. In wet atmospheres, clusters would be composed of about 8 ± 4 molecules corresponding approximately to the size of free volume holes. In contrast, in pure distilled water, clusters consist in a much larger number of water molecules (between 55 and 71) presumably because of an exacerbated swelling of EPDM samples. Thus, immersion in water solution is more drastic than exposure to fully saturated wet atmosphere. The impact of the EPDM formulation (nature and content of crosslinking agent) on these experimental results is clearly of the second order of magnitude.
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