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Methodologies for lifetime predictions of rubber using Arrhenius and WLF models

✍ Scribed by Le Huy, M. ;Evrard, G.

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
141 KB
Volume
261-262
Category
Article
ISSN
0003-3146

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✦ Synopsis

The WLF approach is appropriate for lifetime predictions when polymer ageing is controlled by a viscoelastic process (relaxation, creep). This methodology using time/temperature shift will be illustrated by the creep of SBR/NR.

When physico-chemical mechanisms are dominant, the Arrhenius approach is the most widely used for evaluating accelerated test results involving the effect of temperature. Service lifetimes have been estimated for the thermal ageing of NBR/PVC and for the ageing of HNBR in gaseous fluids.

Predictions using the Arrhenius model usually do not take into account oxygen-diffusion-controlled oxidations. In the case of the thermal ageing of EPDM, extrapolations are determined by the heterogeneity of the oxidative ageing of bulk polymer samples.

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