PH-Dependence of the morphology of micelles formed by poly(2-vinylpyridine)-block-poly(ethylene oxide) copolymers in water

被引：0

作者：

Gohy, Jean-François ^{[1
]}

Mores, Sandrine ^{[1
]}

Varshney, Sunil K. ^{[2
]}

Zhang, Jian-Xin ^{[2
]}

Jérôme, Robert ^{[1
]}

机构：

[1] Centre for Education and Research on Macromolecules (CERM), Institute of Chemistry B6, University of Liège, Sart-Tilman, Liège,4000, Belgium

[2] Polymer Source, 771 Lajoie Street, Dorval,QC,H9P 1G7, Canada

来源：

| 2002年 / European Polymer Federation卷 / 02期

关键词：

Ethylene - Light scattering - Light transmission - Micelles - Polyethylene oxides;

D O I：

10.1515/epoly.2002.2.1.290

中图分类号：

学科分类号：

摘要：

The morphology of micelles formed by two poly(2-vinylpyridine)-blockpoly(ethylene oxide) (P2VP-b-PEO) copolymers has been studied in phosphatebuffered water by dynamic light scattering and transmission electron microscopy. Spherical micelles are observed when the P2VP block is the minor component of the diblock copolymer. When P2VP dominates the composition, transition from spheres-to-rods-to-vesicles takes place in a narrow pH range that straddles the pKa of P2VP. This transition is controlled by the degree of protonation of the P2VP blocks. At high pH, the copolymer precipitates from the solution.

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