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The deformation behavior of semicrystalline polymers associated with polymorphic transformations under tensile deformation is discussed in the case of isotactic polypropylene (iPP). The mechanical properties and polymorphic transformations occurring during plastic deformation of iPP samples with variable stereoregularity, containing only rr stereo-defects, are presented. Thermoplastic materials...
Crystalline polymers may be affected by various kinds and amounts of structural disorder. Lackof order in polymer crystals may arise from the presence of defects in the chemical constitution,configuration and conformation and defects in the mode of packing of chains inside the crystals. Polymericmaterials characterized by long range order in the parallel arrangement of chain axes and a largeamount...
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