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|Type:||Artigo de periódico|
|Title:||Solid-state nuclear magnetic resonance study of relaxation processes in MEH-PPV|
|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.|
|Editor:||American Physical Soc|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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