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| Naji, M. |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Azam, Siraj |
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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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Wozniak-Braszak, Aneta
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Publications (6/6 displayed)
- 2023Experimental and Computer Study of Molecular Dynamics of a New Pyridazine Derivative
- 2023Block copolymer interfaces investigated by means of NMR, atomic force microscopy and dielectric spectroscopy
- 2021Review of Recent Developments of Glass Transition in PVC Nanocompositescitations
- 2020Molecular dynamics in polyester resin doped with barium titanate nanoparticles studied by 1H NMR techniquescitations
- 2014Complementary study of molecular dynamics and domain sizes in heterogenous nanocomposites PBT/DA-C60 and PBT/TCNEO-C60citations
- 2012Effect of fullerene derivates on thermal and crystallization behavior of PBT/decylamine-C 60 and PBT/TCNEO-C 60 nanocompositescitations
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article
Molecular dynamics in polyester resin doped with barium titanate nanoparticles studied by 1H NMR techniques
Abstract
BaTiO3/polymer composites, which combine the high dielectric constant of ceramics with the high dielectric strength of polymers, are used in modern microelectronics as capacitors, piezoelectric transducers and optoelectronic elements. The aim of the work was to determine the effect of barium titanate (BT) nanoparticles on physical properties of polyester resin (PR). The introduction of nanoparticles into a cross-linked polyester resin induces changes in its molecular structure and dynamics as a result of the particle-polymer interface. Molecular dynamics of polyester resin filled with barium titanate nanoparticles with BT content of 0.1% wt. and 1% wt. was studied. The internal motion of cured polyester resin and new PR/BT composites was investigated by different 1H NMR techniques. The temperature dependences of the spin-lattice relaxation times T1 in the laboratory frame and the frequency dispersions of the spin-lattice off-resonance relaxation times T1ρ offin the rotating frame were determined. Also, the first derivative of the absorption 1H NMR signal was recorded and the second moment of the signal was determined as a function of temperature. Differential Scanning Calorimetry was employed to study the thermal properties of the samples. The results showed that BT nanoparticles influenced the molecular dynamics and thermal properties of polyester resin. The addition of BT nanoparticles leads to a decrease in the correlation times and in the activation energy of internal motion in composites, compared with those for pure polyester resin. What is more, the glass transition temperature Tg and the thermal decomposition temperature TD of polymer composites shift to lower values. © 2020 Elsevier Ltd