Abstract
The preoriented isotactic polypropylene (iPP) film, which was prepared by drawing and annealing, was redrawn at the angles of α (α=0, 30, 45 and 60°) to the preoriented direction (named the first draw direction FDD). By high redrawing, the preoriented iPP films were highly reoriented to the redrawing direction (named the second draw direction SDD). The films had the high crystal and amorphous orientation factors; such as fc=0.992 and fam=0.714. The dependence of Tm on DSC scan speed was examined and it was found that the degree of superheating increased with fam. A history of the preorientation remained in the highly redrawn films and it appeared during thermal shrinkage at higher temperatures.
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