| 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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Dingenouts, Nico
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Publications (7/7 displayed)
- 2015Stability of star-shaped RAFT polystyrenes under mechanical and thermal stress
- 2014Stability of star-shaped RAFT polystyrenes under mechanical and thermal stresscitations
- 2014Time-resolved SAXS characterization of the shell growth of silica-coated magnetite nanocompositescitations
- 2013Anomalous small-angle x-ray scattering from mesoporous noble metal catalystscitations
- 2013Linear and nonlinear rheological behavior and crystallization of semicrystalline poly(styrene)-poly(L-lactide) block copolymerscitations
- 2008Determination of the structure factor of polymeric systems in solution by small-angle scattering: a SANS-study of a dendrimer of fourth generation
- 2005Analysis of the correlation of counterions to macroions by anomalous small-angle scattering
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article
Linear and nonlinear rheological behavior and crystallization of semicrystalline poly(styrene)-poly(L-lactide) block copolymers
Abstract
The rheological behavior of a poly(styrene)-poly(L-lactide) (PS-PLLA) block copolymer was investigated in the viscoelastic linear and nonlinear regime. Large amplitude oscillatory shear (LAOS) experiments in the nonlinear regime led to an exponential decay of the G moduli and the nonlinearity parameter I-3/1. During LAOS, the lamellar microstructure of a low molecular weight PS-PLLA copolymer was orientated parallel to the shear field to achieve a macroscopically ordered material. The degree of orientation was analyzed via small angle X-ray scattering (SAXS) measurements. The crystallization kinetics could be accurately described by the Avrami equation as determined by DSC and rheology. These experiments revealed that the crystallization process was slower for the PS-PLLA copolymers than for the PLLA homopolymers. SAXS was also used to monitor the crystallization of the PS-PLLA copolymers. When the temperature of the crystallization experiments, T-c, was lower than the glass transition temperature of the amorphous PS block, 7; (hard confinement), the lamellar microstructure of the low molecular weight PS-PLLA was maintained apart from a small increase in the domain spacing. When T-c was higher than T-g(a) of PS (soft confinement), the block copolymer also retained its lamellar structure, but the increase in the domain spacing was unexpectedly increased compared to what occurred for crystallization under hard confinement conditions. In addition, two-dimensional (2-D) SAXS diffractograms indicated a loss of the structure periodicity during crystallization under soft confinement.