Abstract
The two relaxation mechanisms of low and high activation energy (α1 and α2) which underlie the socalled α relaxation of bulk crystallized polyethylene are re-examined on the relaxation map, taking into account the following facts reported in the literature:(1) The α1 (grain-boundary) relaxation sometimes appears as twin peaks on the loss modulus vs. temperature curve.(2) The time required for the α2 (intra-crystalline) relaxation of the specimens grown from the solution (single crystals) is relatively shorter, and is made longer by a heat treatment.(3) The relaxation time determined by the rheo-optical methods is by no means correlated with the twisting oscillation of the folded molecular chains, that is, the α2 relaxation.
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