Possible factors responsible for the existence of two stages of deformation
of sharply different nature on the rubberlike elasticity plateau are analy
zed. The fast relaxation stage is due to the alpha-process, while the slow
relaxation component is attributed to the lambda-process, the character of
which is related to features of the macromolecular network structure of lin
ear polymers with the junctions (nodes) representing fluctuational quasimic
elles with large lifetimes.