| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Balzano, L.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2016Dissolution and re-emergence of flow-induced shish in polyethylene with a broad molecular weight distributioncitations
- 2014The chemical structure of the amorphous phase of propylene-ethylene random copolymers in relation to their stress-strain propertiescitations
- 2014The chemical structure of the amorphous phase of propylene-ethylene random copolymers in relation to their stress-strain propertiescitations
- 2012Quantification of non-isothermal, multi-phase crystallization of isotactic polypropylene : the influence of shear and pressurecitations
- 2012Quantification of non-isothermal, multi-phase crystallization of isotactic polypropylene : the influence of shear and pressurecitations
- 2010Continuous Cooling Curves Diagrams of Propene/Ethylene Random Copolymers. The Role of Ethylene Counits in Mesophase Developmentcitations
- 2010Continuous cooling curves diagrams of propene/ethylene random copolymers : the role of ethylene counits in mesophase developmentcitations
- 2010Real-time WAXD detection of mesophase development during quenching of propene/ethylene copolymerscitations
- 2009Influence of Nanoparticles on the Rheological Behaviour and Initial Stages of Crystal Growth in Linear Polyethylenecitations
Places of action
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article
Quantification of non-isothermal, multi-phase crystallization of isotactic polypropylene : the influence of shear and pressure
Abstract
Key issue in studying the crystallization process of semi-crystalline polymers, is the need for controlled (or known) boundary and initial conditions. Here dilatometry (PVT) is used to reveal the crystallization kinetics and the resulting morphology of isotactic polypropylene homopolymer as a consequence of the combination of non-isothermal cooling at elevated (isobaric) pressure and application of shear flow. Based on the flow strength the crystallization kinetics can be classified in three regimes; quiescent crystallization, flow enhanced point nucleation and flow-induced creation of oriented structures. Using ex-situ wide angle X-ray diffraction and small angle X-ray scattering we revealed the details of the (oriented) crystalline structures for the different regimes including the different phases (alpha-, beta-, and gamma phase) that can occur in iPP. Some unique oriented structures of combined alpha- and gamma-phase were found. The distribution of the crystal phase content is explained by the interplay of nucleation density and crystal phase dependent growth rate, which are functions of both temperature and pressure.