| 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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Mangialetto, Jessica
Vrije Universiteit Brussel
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2024Construction of furan-maleimide Diels-Alder reversible network cure diagrams: modelling and experimental validation
- 2024Effects of Cure on the Ionic Conductivity and Relaxation Strength of a Reversible Polymer Network Studied by Dielectric Spectroscopy.citations
- 2024Modelling of diffusion-controlled Diels-Alder reversible network formation and its application to cure diagrams
- 2023Diffusion- and mobility-controlled self-healing polymer networks with dynamic covalent bonding
- 2023Separating Kinetics from Relaxation Dynamics in Reactive Soft Matter by Dielectric Spectroscopycitations
- 2023Real-Time Determination of the Glass Transition Temperature during Reversible Network Formation Based on Furan–Maleimide Diels–Alder Cycloadditions Using Dielectric Spectroscopycitations
- 2022UV Stability of Self-Healing Poly(methacrylate) Network Layerscitations
- 2020Self-Healing in Mobility-Restricted Conditions Maintaining Mechanical Robustness: Furan–Maleimide Diels–Alder Cycloadditions in Polymer Networks for Ambient Applicationscitations
- 2019Diffusion- and Mobility-Controlled Self-Healing Polymer Networks with Dynamic Covalent Bondingcitations
- 2018The Effect of Vitrification on the Diels-Alder Reaction Kinetics
Places of action
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article
Effects of Cure on the Ionic Conductivity and Relaxation Strength of a Reversible Polymer Network Studied by Dielectric Spectroscopy.
Abstract
This study employs broadband dielectric spectroscopy (BDS) to investigate the cure kinetics and chemical equilibria of a Diels-Alder (DA) reversible network. Focusing on segmental dynamics, the α-relaxation and ionic conductivity are studied during heating and subsequent cooling right after isothermal precuring at 55 °C. During first heating, the glass transition temperature ( T g ) shows a systematic, stepwise upshift from -35 °C to 46 °C, manifesting both increasing conversion and the shift of the ratio between endo- to exo-cycloadducts. Upon cooling, all experiments yield T g values around 40 °C indicating partial depolymerization, which is confirmed by kinetic model simulations. Ionic conductivity analysis, employing the Debye-Stokes-Einstein relation, confirms charge transport assisted by segmental motions with partial decoupling of the α-relaxation time from ionic conductivity (fractional DSE behavior) between T g and T g ×1.2. Surprisingly, the degree of coupling, given by the FDSE exponent S , drops until reaching the gel point (~30 min.) with no further changes upon extended cure. In contrast, a continuous increase in dc-conductivity with curing time is observed, attributed to enhanced intrinsic conductivity via improved H-bonding. Investigation of the α-relaxation strength and shape reveals subtle trends, reflecting changes in the dipole-dipole correlation and equilibrium shifts between cycloadducts. This work offers insights into the glass transition dynamics in reversible polymeric networks and might provide a basis for similar studies in systems undergoing chemical or physical transformations.