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- W3000360049 abstract "Isotactic polypropylene (iPP) rich in β crystal modification was deformed by plane-strain compression at T = 55-100 °C. The evolution of phase structure, morphology, and orientation were studied by DSC, X-Ray, and SEM. The most important deformation mechanisms found were interlamellar slip operating in the amorphous layers, resulting in numerous fine deformation bands and the crystallographic slip systems, including the (110)[001]β chain slip and (110)[$1{bar {1}}0$]β transverse slip. Shear within deformation bands leads to β[rightward arrow]α solid state phase transformation in contrast to β[rightward arrow]smectic transformation observed at room temperature. Newly formed α crystallites deform with an advancing strain by crystallographic slip mechanism, primarily the (010)[001]α chain slip. As a result of deformation and phase transformation within deformation bands β lamellae are locally destroyed and fragmented into smaller crystals. Deformation to high strains, above e = 1, brings further heavy fragmentation of lamellae, followed by fast rotation of crystallites with chain axis towards the direction of flow FD. This process, together with still active crystallographic slip, leads to the final texture with molecular axis of both crystalline β and α phase oriented along FD. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 92-108, 2008" @default.
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- W3000360049 date "2008-01-01" @default.
- W3000360049 modified "2023-09-23" @default.
- W3000360049 title "Plastic deformation behavior of β phase isotactic polypropylene in plane-strain compression at elevated temperatures Part B Polymer physics" @default.
- W3000360049 hasPublicationYear "2008" @default.
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