Magnetic resonance study of polymeric composites and fluoroindate glasses. / Estudo de compósitos poliméricos e vidros fluoroindatos por ressonância magnética.

AUTOR(ES)

Roberto Weider de Assis Franco

DATA DE PUBLICAÇÃO

1999

RESUMO

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.

ASSUNTO(S)

composites compósitos epr rmn glasses rpe vidros. nmr.

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