Light scattering and luminescence studies on self-aggregation behavior of amphiphilic copolymer micelles

被引：17

作者：

Yao, Jun Hong ^{[1
,2
]}

Mya, Khine Yi ^{[2
]}

Li, Xu ^{[2
]}

Parameswaran, Manoj ^{[1
]}

Xu, Qing-Hua ^{[1
]}

Loh, Kian Ping ^{[1
]}

Chen, Zhi-Kuan ^{[2
]}

机构：

[1] Natl Univ Singapore, Dept Chem, Singapore 117543, Singapore

[2] Inst Mat Res & Engn, Singapore 117602, Singapore

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2008年 / 112卷 / 03期

关键词：

D O I：

10.1021/jp076351i

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 (N-agg(app)), and apparent molecular weight of polymer aggregates (M-w,(app)(agg)). 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.

引用

页码：749 / 755

页数：7

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