| 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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Nysten, Bernard
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (54/54 displayed)
- 2024Influence of physical ageing and fibre proximity on the local mechanical response of the Elium® thermoplastic composite matrixcitations
- 2023Accurate determination of stiffness and strength of graphene via AFM-based membrane deflectioncitations
- 2022Integrated Approach to Eco-Friendly Thermoplastic Composites Based on Chemically Recycled PET Co-Polymers Reinforced with Treated Banana Fibrescitations
- 2022Ion Partition Detected in Homeopathically Manufactured Medicine Cuprum metallicum and Controlscitations
- 2021Nanomechanics serving polymer-based composite researchcitations
- 2019Spatial resolution and property contrast in local mechanical mapping of polymer blends using AFM dynamic force spectroscopycitations
- 2019A quantitative determination of the polymerization of benzoxazine thin coatings by timeâ€ofâ€flight secondary ion mass spectrometrycitations
- 2019Graphene effect on mechanical response of copper film
- 2019A quantitative determination of the polymerization of benzoxazine thin coatings by time‐of‐flight secondary ion mass spectrometrycitations
- 2018Characterization and modeling of the ageing of polymers in contact to fluids using nanomechanical probes
- 2018Specific core-shell approaches and related properties in nanostructured ferroelectric ceramicscitations
- 2018Specific core-shell approaches and related properties in nanostructured ferroelectric ceramicscitations
- 2018Specific core-shell approaches and related properties in nanostructured ferroelectric ceramicscitations
- 2018Hybrid gate dielectrics: a comparative study between polyvinyl alcohol/SiO2 nanocomposite and pure polyvinyl alcohol thin-film transistorscitations
- 2018Influence of Heat Treatments on Microstructure and Magnetic Domains in Duplex Stainless Steel S31803citations
- 2018A benzoxazine/substituted borazine composite coating: A new resin for improving the corrosion resistance of the pristine benzoxazine coating applied on aluminumcitations
- 2017Cross-linking degree of benzoxazine thin coatings determined by ToF-SIMS
- 2016Synergistic local toughening of high performance epoxy-matrix composites using blended block copolymer-thermoplastic thin filmscitations
- 2016Growth and toxic gas sensing properties of poly(urethaneimide) thin filmscitations
- 2015Field-effect memory transistors based on arrays of nanowires of a ferroelectric polymer
- 2015Fracture mechanics based analysis of the scratch resistance of thin brittle coatings on a soft interlayercitations
- 2015Surface electrical properties of stainless steel fibres: An AFM-based studycitations
- 2014Fracture toughness measurement of ultra-thin hard films deposited on a polymercitations
- 2014The Ferro- to Paraelectric Curie Transition of a Strongly Confined Ferroelectric Polymercitations
- 2013Electronic properties of dioctylterthiophene-based organic thin-film transistors: A Kelvin probe force microscopy studycitations
- 2012New insight into the "depth of cure" of dimethacrylate-based dental compositescitations
- 2012Optimization of the structural parameters of new potentiometric pH and urea sensors based on polyaniline and a polysaccharide coupling layercitations
- 2012Metal condensates for low-molecular-weight matrix-free laser desorption/ionizationcitations
- 2011Influence of nanoparticle–polymer interactions on the apparent migration behaviour of carbon nanotubes in an immiscible polymer blendcitations
- 2011Melting and van der Waals Stabilization of PE Single Crystals Grown from Ultrathin Filmscitations
- 2011Influence of nanoparticle–polymer interactions on the apparent migration behaviour of carbon nanotubes in an immiscible polymer blendcitations
- 2010pH and Enzymatic Sensors Based on Nanostructured Conductive Polymer Films
- 2010Bidimensional Response Maps of Adaptive Thermo- and pH-Responsive Polymer Brushescitations
- 2009In situ detection of porosity initiation during aluminum thin film anodizingcitations
- 2008Structural and magnetic characterization of a carburized cast austenitic steelcitations
- 2007Nanomechanics with the atomic force microscope on polymer surfaces, interfaces and nano-materials
- 2007Scanning Probe Microscopies : Principles and Applications to Micro- and Nano-Fiberscitations
- 2005Multitechnique characterization of thin films of immiscible polymer systems: PS-b-PMMA diblock copolymers and PS-PMMA symmetric blendscitations
- 2005Partial dewetting of polyethylene thin films on rough silicon dioxide surfaces.citations
- 2005Elastic modulus of nanomaterials: resonant contact-AFM measurement and reduced-size effects (invited lecture)citations
- 2004Surface tension effect on the mechanical properties of nanomaterials measured by atomic force microscopycitations
- 2004Atomic Force Microscopies and Polymer Blends : Principles and Applications to Surfaces and Interfaces (invited lecture)
- 2004Difference in the annealing behaviour of thin films of PS/PMMA blends and copolymers as revealed by ToF-SIMS and AFMcitations
- 2003Image analysis of transmission electron micrographs of semicrystalline polymers: a comparison with X-ray scattering resultscitations
- 2003Physical properties of conducting polymer nanofiberscitations
- 2003Measurement of elastic modulus of nanotubes by resonant contact atomic force microscopycitations
- 2003Spinodal-like dewetting of thermodynamically-stable thin polymer films.citations
- 2003Size effect on the elastic modulus of nanomaterials as measured by resonant contact atomic force microscopy
- 2001Characterization of the molecular structure of two highly isotactic polypropylenescitations
- 2001Chemical recognition of antioxidants and UV-light stabilizers at the surface of polypropylene: Atomic force microscopy with chemically modified tipscitations
- 2001Chemical Recognition of Antioxidants and UV-light Stabilizers on the Surface of Polypropylene : Atomic Force Microscopy with Chemically Modified Tipscitations
- 2000PEEK oligomers as physical model compounds for the polymer. 4. Lamellar microstructure and chain dynamics.citations
- 2000Elastic modulus of polypyrrole nanotubescitations
- 2000Nano-structured polymer blends: phase structure, crystallisation behaviour and semi-crystalline morphology of phase separated binary blends of poly(ethylene oxide) and poly(ether sulphone)citations
Places of action
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article
Characterization of the molecular structure of two highly isotactic polypropylenes
Abstract
Two polypropylenes, PP1 and PP2, produced with different heterogeneous Ziegler-Natta catalytic systems were studied in this work. Preliminary characterization of the non-fractionated materials showed that a low difference in their average tacticity (PP2 > PP1) leads to an important modification of their rigidity properties. In order to establish correlation between the molecular structure parameters and the rigidity properties of these polymers, fractionation of the materials according to crystallizability was performed by means of temperature rising elution fractionation (TREF). Analysis of the fractions of both PP1 and PP2 was carried out by means of C-13 NMR, size exclusion chromatography (SEC), differential scanning calorimetry (DSC) and atomic force microscopy (AFM). The results first showed that TREF does not strictly fractionate PP according to tacticity, but according to the longest crystallizable sequence in a chain. C-13 NMR, SEC and DSC analysis of the fractions demonstrated that the inter-chain tacticity distributions of the polypropylenes is affected by the change of the polymerization conditions, which, in turn, modifies the rigidity properties of the materials. Some results also seem to indicate that the intrachain tacticity distributions are different for the two PP. An AFM study of the elastic modulus was carried out for the first time on the TREE fractions. It showed that the rigidity or the fractions strongly increases as the TREF elution temperature increases in accordance with a concomitant increase of isotacticity and the crytallinity of the fractions. PP2 TREE fractions were, moreover, found to exhibit a higher elastic modulus than PP1 TREF fractions at all elution temperatures. This study allowed us to further identify the TREF fractions that were responsible for differences in rigidity. To summarize, it is shown how the experimentally observed increase of the average rigidity of one of these two polypropylenes can be rationalized via information collected from a TREF fractionation. ...