relaxation

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If the polymer is capable of exhibiting a secondary transition [Beta], (associated to the local relaxation modes of the macromolecular structure or the relaxation of the side groups), Bauwens showed that at high strain rates, the variation of the yield stress with the strain rate can be described by the generalized theory proposed by Ree-Eyring (2):
By defining the temperature- and pressure-dependent local relaxation time
Goyanes argues that this type of relaxation is normally associated with local relaxations in the molecule backbone of PS.