| 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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Jonas, Am
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2015Field-effect memory transistors based on arrays of nanowires of a ferroelectric polymer
- 2014The Ferro- to Paraelectric Curie Transition of a Strongly Confined Ferroelectric Polymercitations
- 2012Optimization of the structural parameters of new potentiometric pH and urea sensors based on polyaniline and a polysaccharide coupling layercitations
- 2011Melting and van der Waals Stabilization of PE Single Crystals Grown from Ultrathin Filmscitations
- 2010pH and Enzymatic Sensors Based on Nanostructured Conductive Polymer Films
- 2010Bidimensional Response Maps of Adaptive Thermo- and pH-Responsive Polymer Brushescitations
- 2006First insights into electrografted polymers by AFM-based force spectroscopycitations
- 2005A theoretical and experimental study of atomic-layer-deposited films onto porous dielectric substrates
- 2005Partial dewetting of polyethylene thin films on rough silicon dioxide surfaces.citations
- 2003Image analysis of transmission electron micrographs of semicrystalline polymers: a comparison with X-ray scattering resultscitations
- 2003Spinodal-like dewetting of thermodynamically-stable thin polymer films.citations
- 2001Characterization of the molecular structure of two highly isotactic polypropylenescitations
- 2000PEEK oligomers as physical model compounds for the polymer. 4. Lamellar microstructure and chain dynamics.citations
Places of action
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article
PEEK oligomers as physical model compounds for the polymer. 4. Lamellar microstructure and chain dynamics.
Abstract
Crystals of monodisperse linear poly(oxy-1,4-phenyleneoxy-1,4-phenylenecarbonyl-1,4-phenylene) (PEEK) oligomers have been reinvestigated by wide-angle and small-angle X-ray scattering and atomic force microscopy (AFM). For the shorter oligomer investigated (containing six phenyl groups), a correlated packing of the chains is observed in the direction of the chain axis, with the formation of crystals being much thicker than the oligomer extended chain length. This results from the alignment of chain ends in planes, as revealed by AFM. A crystal structure is proposed for this oligomer, consistent with both AFM and X-ray diffractometry results. By contrast, the longer oligomer (containing 12 phenyl groups) presents a crystalline morphology consisting of stacks of atomically uncorrelated thin lamellar crystals, whose thicknesses are about the extended chain length computed for the oligomer. This is due to random staggering of the chains along their axes in the crystals, as suggested previously. CP/MAS C-13 solid-state NMR proton spin-lattice relaxation experiments reveal that these morphological differences induce variations in the chain dynamics of the oligomers and confirm that only the longer oligomer can be taken as a good model for a isolated crystal phase. From this study, reference values at room temperature are proposed for the specific mass of a perfect PEEK crystal [1.412(1) g.cm(-3)] and for the proton spin-lattice relaxation time of such a crystal [3.6(2) s].