Abstract
The mechanism of deformation in an adsorption-active medium of amorphous and crystalline poly(ethylene terephthalate) changes near a secondary relaxational transition at a temperature T r < T g: necks begin to develop instead of crazes at temperatures above T r, because the new modes of intramolecular motion set free at T r accelerate diffusion of the liquid into the amorphous regions of the polymer. The diffusion is not associated with the existence of stress in the polymer. Maxima which appear on the dependence of liquid effectivity on the rate are caused by sorption phenomena.
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