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Drawing-induced α crystal–mesophase transition of isotactic polypropylene (iPP) was studied with in situ wide angle X-ray diffraction (WAXD) during the true stress–true strain tensile testing. The true stress–true strain and in situ WAXD measurements revealed that the critical stress for the crystal–mesophase transition has a nearly linear correlation with lamellar thickness irrespective of the sample...
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