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The development of the crystallinity and of the crystallographic orientationof isotactic polypropylene (iPP) during rolling deformation and subsequent heattreatment is studied. The experiments are conducted by using X-ray diffractionwith an area detector. The evolution of crystallographic orientation is trackedby calculating the pole figures and by applying a quantitative 3D texturecomponent fit method. The rolling orientation after a true strain of -1.5mainly consists of the (010)[001], (130)[001], and [001]//RD fiber components(RD: rolling direction). The results reveal that the crystallinity drasticallydecreases during rolling. We suggest that decrystallization (disaggregation) isa deformation mechanism which takes place as a microscopic alternative tocrystallographic intralamellar shear depending on the orientation of thelamellae relative to the imposed deformation tensor. Heat treatment afterrolling leads to the recrystallization of amorphous material and to a strongenhancement of the fiber orientation component. The recrystallizationorientation is explained in terms of an oriented nucleation mechanism whereamorphous material aligns along existing crystalline lamellae blocks whichprevailed during the preceding deformation.

Crystallinity and Crystallographic Texture in Isotactic Polypropylene during Deformation and Heating