Photophysical properties of polymers modified with light-emitting groups : crosslinked polyethylenes and poly (methyl methacrylate) / Propriedades fotofisicas de polimeros modificados com grupos emissores : polietilenos reticulados e poli (metacrilato de metila)

AUTOR(ES)

Tatiana Duque Martins

DATA DE PUBLICAÇÃO

2006

RESUMO

Fluorescent systems with interesting photophysical properties were the aim of this work. Fluorescent molecules sorbed into polymeric matrices can act as local probes for any mechanical processes that occur leading to changes in the optical response of the probe. In this work pyrene and a carbazole derivative were employed as fluorescent sensor for relaxation processes of polymeric matrices. Pyrene was attached to a series of low density polyethylene with distinct crosslink amounts in order to verify the influence of the crosslink density in the occurrence of the mechanical relaxation processes. Carbazolyl groups were attached to a poly(mehtylmethacrylate) -co- (methacrylic acid) and the temperatures where its relaxation processes were determined. This modified copolymer were used as component of a blend with poly(2-metoxy-5-(2 -ethyl-hexyloxy)-1,4-phenylenevynilene) (MEH-PPV). By using several fluorescence spectroscopy techniques as steady-state spectroscopy, time-resolved fluorescence spectroscopy and fluorescence microscopy, information about blend component miscibility and energy transfer mechanisms were obtained.

ASSUNTO(S)

pmma fluorescence fluorescencia pmma propriedades fotofisicas polietileno polyethylene photophysical properties

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