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Thèse de Doctorat
DOI
10.11606/T.76.1999.tde-09092008-095955
Document
Auteur
Nom complet
Roberto Weider de Assis Franco
Unité de l'USP
Domain de Connaissance
Date de Soutenance
Editeur
São Carlos, 1999
Directeur
Jury
Gonzalez, Jose Pedro Donoso (Président)
Gandra, Flavio Cesar Guimarães
Nascimento, Otaciro Rangel
Rabbani, Said Rahnamaye
Zanotto, Edgar Dutra
Titre en portugais
Estudo de compósitos poliméricos e vidros fluoroindatos por ressonância magnética.
Mots-clés en portugais
Compósitos
RMN
RPE
Vidros.
Resumé en portugais
Foram estudados compósitos poluméricos e vidros fluoroindatos utilizando as espectroscopias de Ressonância Magnética Nuclear (RMN) pulsada e Ressonância Paramagnética Eletrônica (RPE). O estudo de RMN do 1H nos compósitos baseado no polímero polióxido de etileno e partículas de carbono permitiu diferenciar as mobilidades das cadeias poluméricas e identificar as contribuições destas fases. A partir das medidas de RPE foi possível sugerir uma interpretação das interações entre as partículas de carbono nos compósitos. Nos vidros fluoroindatos foi estudado o processo de cristalização, sendo acompanhada sua influência na relaxação nuclear do 19F. A cristalização foi observada por RPE nos vidros dopados com Cu2+, Mn2+ e Gd3+, sendo verificadas as alterações locais causadas por este processo.
Titre en anglais
Magnetic resonance study of polymeric composites and fluoroindate glasses.
Mots-clés en anglais
Composites
EPR
Glasses
NMR.
Resumé en anglais
Polymeric composites and fluoroindate glasses were studied using pulsed Nuclear Magnetic Resonance (NMR) and Electron Paramagnetic Resonance (EPR) spectroscopies. Study of the composite formed by the polymer poly-ethylene oxide and carbon particles allowed us to distinguish the mobilities of polimeric chains and to identify the contributions from different phases. From EPR measurements it was possible to suggest an interpretation of the interactions between carbon particles in the composites. The main objective in the fluoroindate glasses study was to follow the crystallzation process. The 19F NMR measurements allowed to the observation of the influence of this process in the nuclear relaxation. The crystallization was also tracked by EPR spectroscopy in the doped glasses with the paramagnetic ions Cu2+, Mn2+ and Gd3+. This was accomplished by observing the local alterations caused by that process.
 
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RobertoFrancoD.pdf (4.02 Mbytes)
Date de Publication
2008-09-10
 
AVERTISSEMENT: Le matériau se réfère à des documents provenant de cette thèse ou mémoire. Le contenu de ces documents est la responsabilité de l'auteur de la thèse ou mémoire.
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