ポリエチレンのα緩和について

抄録

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.