ISSN:
1292-895X
Keywords:
PACS. 61.41.+e Polymers, elastomers and plastics. – 62.40.+i Anelasticity, internal friction, stress relaxation, and mechanical resonances. – 83.50.By Transient deformation and flow; time-dependent properties: star-up, stress relaxation, creep, recovery, etc.
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract. We report a dynamical-mechanical study of stress relaxation at small deformation in a natural (polyisoprene) rubber well above its glass transition temperature . We find that an almost complete relaxation of stress takes place over very long relaxation periods, even though the elastic network is 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 nature of rubber cross-links, capable of isomerisation under stress, and relate the results to recent models of slow glassy rheology.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s101890050015
