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Type: Artigo de periódico
Title: Solid-state nuclear magnetic resonance study of relaxation processes in MEH-PPV
Author: Bloise, AC
DeAzevedo, ER
Cossiello, RF
Bianchi, RF
Balogh, DT
Faria, RM
Atvars, TDZ
Bonagamba, TJ
Abstract: Solid-state nuclear magnetic resonance methods were used to study molecular dynamics of MEH-PPV at different frequency ranges varying from 1 Hz to 100 MHz. The results showed that in the 213 to 323 K temperature range, the motion in the polymer backbone is predominantly slow (Hz-kHz) involving small angle librations, which occurs with a distribution of correlation times. In the side chain, two motional regimes were identified: Intermediate regime motion (1-50 kHz) for all chemical groups and, additionally, fast rotation (similar to 100 MHz) for the terminal CH3 group. A correlation between the motional parameters and the photoluminescent behaviors as a function of temperature was observed and is discussed.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.71.174202
Date Issue: 2005
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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