Elastomeric polypropylene characterized by chains with an isotactic and atactic stereoblock structure shows elastic behavior in a large range of deformations notwithstanding the high degree of crystallinity, because of the occurrence of flip-flop reversible reorientation of crystals of the γ form that occur during stretching and the successive release of tension, as shown schematically in the figure.
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Auriemma et al. (2007) studied this question.
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