Summary
The retraction of stretched molecules explains the intermediate step of relaxation observed at short times with strained polymer melts instead of a single rubberlike plateau.
The stress relaxation following a rapid deformation is derived in this zone of the spectrum from the non linear, quasi elastic response of the transient network formed by the system of entangled chains. This method corrects an approximate calculation of the modulus decline in DOI's original treatment of the molecular equilibration process.
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References
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Thirion, P. Revisal of the chain equilibration process in strained polymer melts. Polymer Bulletin 6, 541–546 (1982). https://doi.org/10.1007/BF00256376
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DOI: https://doi.org/10.1007/BF00256376