Abstract
The experimental properties of the δc-relaxation observed in polyethylene, poly(oxymethylene), and poly(ethylene terephthalate) at about 50°K are reviewed. A mechanism is proposed involving the thermally activated redistribution of kinks along a discontinuous dislocation under an applied stress. The activation energy and relaxation intensity are discussed with reference to specific chain conformations in the dislocation. It is suggested that the kinked dislocations arise from external stresses transferred to the crystalline or ordered regions of the polymer possibly via tie molecules. These stresses are greatest in deformed material or material annealed under constraint and accounts for the increase in peak height observed in these specimens.
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Hiltner, A., Baer, E. A Dislocation Mechanism for Cryogenic Relaxations in Crystalline Polymers. Polym J 3, 378–388 (1972). https://doi.org/10.1295/polymj.3.378
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DOI: https://doi.org/10.1295/polymj.3.378