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| Naji, M. |
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| Taccardi, Nicola |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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Sacco, Federico Di
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Publications (5/5 displayed)
- 2022Confined crystallization and polymorphism in iPP thin filmscitations
- 2022Crystallization kinetics of melt-mixed 3D hierarchical graphene/ polypropylene nanocomposites at processing-relevant cooling ratescitations
- 2021Revisiting the Mechanism of the Meso-to-α Transition of Isotactic Polypropylene and Ethylene-Propylene Random Copolymerscitations
- 2020Systematic Investigation on the Structure-Property Relationship in Isotactic Polypropylene Films Processed via Cast Film Extrusioncitations
- 2019Versatile multi-functional block copolymers made by atom transfer radical polymerization and post-synthetic modificationcitations
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article
Confined crystallization and polymorphism in iPP thin films
Abstract
<p>The morphological and structural evolution of isotactic polypropylene (iPP) in thin and ultrathin films casted by hot-solution spin coating is investigated by means of atomic force microscopy (AFM) and grazing incidence wide angle X-ray scattering (GIWAXS). When reducing the film thickness from 300 nm to 15 nm, changes from a 3D to a quasi-2D morphology are observed. The quasi-2D confined morphology is found in the 220-40 nm thickness range and is characterized by a predominant edge-on orientation (EO) of the lamellae. A transition to the flat-on (FO) orientation paired to a drastic decrease of the sample roughness is observed for thicknesses below 30 nm. Surprisingly, a mixed morphology where orthorhombic γ-phase branches develop from FO α-phase lamellae is observed at the lowest prepared thickness of 15 nm. The unexpected appearance of the γ-phase for the iPP grade used here is due to the favourable flat-on lamellar orientation at the lowest film thickness. Thanks to a quantitative analysis of the GIWAXS patterns, the relative amount between edge-on and flat-on oriented lamellae (χ<sub>EO</sub>/χ<sub>FO</sub>) is calculated, providing useful insights on the real morphological composition of the iPP thin films, a task that is very challenging to achieve with microscopy techniques.</p>