Light scattering and luminescence studies on self-aggregation behavior of amphiphilic copolymer micelles.
J Phys Chem B
; 112(3): 749-55, 2008 Jan 24.
Article
em En
| MEDLINE
| ID: mdl-18154284
ABSTRACT
The self-aggregation behavior of three amphiphilic graft copolymers, oligo(9,9-dihexyl)fluorence-graft-poly(ethylene oxide) (OHF-g-PEO), with different architectures was studied by dynamic and static light scattering (DLS and SLS) in combination with fluorescence spectroscopy and transmission electron microscopy (TEM). The formation of self-assembled polymeric micelles was confirmed by SLS and TEM. DLS and SLS analyses showed that the architecture of graft copolymers has a dramatic effect on critical aggregation concentration (CAC), micelle size distribution, apparent aggregation number (Nagg app), and apparent molecular weight of polymer aggregates (Mw,agg app). An architecture-dependent excimer emission, resulting from the pi-pi stacking of the oligofluorene backbones, was also observed from the photoluminescence spectra of the micelle aqueous solutions, which indicated a strong intermolecular interaction among the polymeric molecules. The excimer emission was further investigated by time-resolved fluorescence spectroscopy.
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Base de dados:
MEDLINE
Assunto principal:
Polietilenoglicóis
/
Espalhamento de Radiação
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Materiais Biocompatíveis
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Luminescência
/
Fluorenos
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Micelas
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article