Time-resolving study of stress-induced transformations of isotactic polypropylene through wide angle X-ray scattering measurements

Auriemma, Finizia; De Rosa, Claudio; Di Girolamo, Rocco; Malafronte, Anna; Scoti, Miriam; Mitchell, Geoffrey Robert; Esposito, Simona

http://hdl.handle.net/10400.8/8451

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Authors

Mitchell, Geoffrey Robert

Esposito, Simona

Abstract(s)

The development of a highly oriented fiber morphology by effect of tensile deformation of stereodefective isotactic polypropylene (iPP) samples, starting from the unoriented form, is studied by following the transformation in real time during stretching through wide angle X-ray scattering (WAXS) measurements. In the stretching process, after yielding, the initial form transforms into the mesomorphic form of iPP through mechanical melting and re-crystallization. The analysis of the scattering invariant measured in theWAXS region highlights that the size of the mesomorphic domains included in the well oriented fiber morphology obtained at high deformations increases through a process which involves the coalescence of the small fragments formed by effect of tensile stress during lamellar destruction with the domain of higher dimensions.

Keywords

Isotactic polypropylene Stress-induced phase transitions Structural analysis X-ray diffraction

URI

http://hdl.handle.net/10400.8/8451

Citation

Auriemma, F.; De Rosa, C.; Di Girolamo, R.; Malafronte, A.; Scoti, M.; Mitchell, G.R.; Esposito, S. Time-Resolving Study of Stress-Induced Transformations of Isotactic Polypropylene through Wide Angle X-ray Scattering Measurements. Polymers 2018, 10, 162. https://doi.org/10.3390/polym10020162