Abstract
The effect of annealing on the change of microcraze structure formed during deformation of isotactic polypropylene (PP) at 20° has been studied. With annealing in the 20–100° range, the diameter of the fibrils joining the walls of the microcrazes is increased but the volume of micropores is unchanged as the treatment temperature is increased. In the temperature region above 100°, a decrease in the degree of dispersivity of the material of the microcrazes is accompanied by a decrease in the volume of the micropores. It was shown that annealing laeds to stabilization of the porous structure, formed by stretching the PP.
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