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

• Autor(a) principal: Auriemma, Finizia
• Data de Publicação: 2018
• Outros Autores: De Rosa, Claudio, Di Girolamo, Rocco, Malafronte, Anna, Scoti, Miriam, Mitchell, Geoffrey Robert, Esposito, Simona
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.8/8451
• topic: Isotactic polypropylene; Stress-induced phase transitions; Structural analysis; X-ray diffraction

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.