| 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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Klonos, Panagiotis
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2024Preparation and Structural-Thermodynamical Investigation of Renewable Copolyesters Based on Poly (Ethylene Succinate) and Polyisosorbidecitations
- 2022Poly(vinyl pyridine) and Its Quaternized Derivatives: Understanding Their Solvation and Solid State Propertiescitations
- 2022Effect of Micro- and Nano-Lignin on the Thermal, Mechanical, and Antioxidant Properties of Biobased PLA–Lignin Composite Filmscitations
- 2021Comparative study of crystallization, semicrystalline morphology, and molecular mobility in nanocomposites based on polylactide and various inclusions at low filler loadingscitations
- 2017Effects of hydration/dehydration on interfacial polymer fraction and dynamics in nanocomposites based on metal-oxides and physically adsorbed polymercitations
- 2016Structure-properties investigations in hydrophilic nanocomposites based on polyurethane/poly(2-hydroxyethyl methacrylate) semi-interpenetrating polymer networks and nanofiller densil for biomedical application
- 2016Morphology and molecular dynamics investigation of PDMS adsorbed on titania nanoparticles: Effects of polymer molecular weight
- 2014Evaluation of the formed interface in biodegradable poly(l-lactic acid)/graphene oxide nanocomposites and the effect of nanofillers on mechanical and thermal propertiescitations
Places of action
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article
Effects of hydration/dehydration on interfacial polymer fraction and dynamics in nanocomposites based on metal-oxides and physically adsorbed polymer
Abstract
Effects of hydration on interfacial dynamics of polydimethylsiloxane (PDMS) adsorbed on silica and titania nanoparticles in the form of aggregates of different specific surface area (SBET, 25 – 342 m2/g) were studied employing equilibrium water sorption/desorption isotherms (ESI/EDI) and broadband dielectric spectroscopy (BDS). ESI revealed a systematic increase of water content, h, of initial oxides (varying up to 60 wt%) with increasing of SBET, whereas changes in h in nanocomposites (PNCs) are very weak (0.1–0.3 wt%) and practically independent from SBET. BDS allowed for the detection of an increase in the interfacial polymer fraction with hydration, accompanied with a significant enhancement of dynamics and cooperativity of the corresponding segmental relaxation in the interfacial layer (αint relaxation), changes being reversible as recorded by hydration and subsequent dehydration of the samples. At the same time, bulk PDMS dynamics in PNCs (α relaxation) was not significantly affected. Effects of hydration on the characteristics of αint in PNCs were found to be qualitatively similar here with changes imposed by thermal annealing (resulting in increasing crystallinity) and surface modifications (resulting in changes in SBET) recorded recently in similar PNCs. Hydration effects were additionally followed via monitoring the dielectric relaxation process attributed to hydrated hydroxyls at the surfaces of the oxides (S relaxation) in the PNCs. The results may suggest that with increasing h the concentration of contact points between the solid surface (oxides) and the polymer chains increases, while the polymer chain conformations at the interface change towards an increase in loop-like interfacial polymer segments.