Ageing of Natural Rubber under Stress

Details Ageing of Natural Rubber under Stress Ageing of Natural Rubber under Stress

2000-05-04

arxiv.org/abs/cond-mat/0005092v1

Physics

Condensed Matter

Soft Condensed Matter

Latex 2e (EPJ style), 5 EPS figures

Scientific paper

10.1007/s101890050015

We report a dynamical-mechanical study of stress relaxation at small deformation in a natural (polyisoprene) rubber well above its glass transition temperature Tg. We find that an almost complete relaxation of stress takes place over very long periods of time, even though the elastic network integrity is fully retained. The relaxation rate and the long-time equilibrium modulus are sensitive functions of temperature which do not follow time-temperature superposition. Many characteristic features of non-ergodic ageing response are apparent at both short and very long times. We interpret the observed behaviour in terms of the properties of rubber crosslinks, capable of isomerisation under stress, and relate the results to recent models of soft glassy rheology.

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