Onion-Type Micelles from Polystyrene-block-poly(2-vinylpyridine) and Poly(2-vinylpyridine)-block-poly(ethylene oxide)
| Autor: | Petr Munk, Maria Ruela Talingting, Zdenek Tuzar, Stephen E. Webber |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
chemistry.chemical_classification
Hydrodynamic radius Polymers and Plastics Ethylene oxide Chemistry Organic Chemistry Polymer Micelle Inorganic Chemistry chemistry.chemical_compound Anionic addition polymerization Dynamic light scattering Critical micelle concentration Polymer chemistry Materials Chemistry Copolymer |
| Zdroj: | Macromolecules. 32:1593-1601 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma981269u |
| Popis: | Polystyrene-block-poly(2-vinylpyridine) (PS-b-PVP) was synthesized by anionic polymerization. Micellization of PS-b-PVP was accomplished by dissolving the polymer in a 45:50:5 volume ratio methanol:dioxane:water mixture followed by a stepwise dialysis into a 0.1 M HCl solution. The hydrophobic PS blocks form the core of the micelles, and the protonated PVPH+ forms the outer shell. Addition of poly(2-vinylpyridine)-block-poly(ethylene oxide) (PVP-b-PEO) and titration to a pH above 10 causes a coprecipitation of the PVP blocks of both copolymers, forming three-layered micelles that we refer to as “onion” micelles. The micellar structures were investigated by static and dynamic light scattering and transmission electron microscopy. The weight ratio of PVP-b-PEO to PS-b-PVP was varied during the onion micelle preparation to study the fraction of PVP-b-PEO that is adsorbed on the PS-b-PVP “core micelle”. The stability with respect to dilution of the micelles formed from PS-b-PVP and of the onion micelles was s... |
| Databáze: | OpenAIRE |
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