Relaxation processes and polymeric chain interpenetration in a PMMA-Cz/ MEH-PPV blend studied by fluorescence spectroscopy
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Data
2013-12
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Resumo
Miscibility and energy transfer processes of a blend containing 0.1 % of Poly[2-methoxy-5-(2-ethylhexyloxy)-
1,4-phenylenevinylene] (MEH-PPV) in a matrix of poly(methyl-methacrylate) containing 1% of attached carbazolyl
groups (PMMA-Cz) were studied by fluorescence spectroscopy and microscopy techniques. From SEM micrographs, a
uniform surface is found. The images on the cryogenic fracture of the blend does not show domains, although from
fluorescence optical microscopy domains of MEH-PPV of about 30 μm in the PMMA-Cz matrix were observed, indicating
the immiscibility of the blend components. By steady-state and time-resolved fluorescence spectroscopies measured at
room temperature and at 77 K, it was found that there is an important non-radiative energy transfer occurring by Forster
mechanism and due to that, there must be an interpenetration degree between polymeric chains specially at room
temperature, which is evidence for miscibility. This can be inferred also by temperature-dependent fluorescence
spectroscopy, which informs about relaxation processes occurring in the blend and also reveals the occurrence of an
interface effect that is characteristic of miscible components.
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Carbazole, FRET, MEH-PPV, Chain interpenetration, PMMA, Relaxation processes
Citação
MARTINS, T. D.; ATVARS, T. D. Z. Relaxation processes and polymeric chain interpenetration in a PMMA-Cz/ MEH-PPV blend studied by fluorescence spectroscopy. Journal of Composites and Biodegradable Polymers, Seul, v. 1, n. 1, p. 66-77, Dec. 2013.