Summary
It is demonstrated that in the process of ultradrawing of semicrystalline polypropylene the morphology of the initial material plays major role. Extremely high draw ratios are obtained (λmax≈50) when drawing “hard elastic” polypropylene films perpendicular to their initial molecular orientation. This behaviour is explained by the molecular processes of plastic deformation.
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Petermann, J., Karbach, A. & Felt, K. Ultradrawing of “springy” polypropylene films. Polymer Bulletin 18, 355–360 (1987). https://doi.org/10.1007/BF00256237
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DOI: https://doi.org/10.1007/BF00256237