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Soluble Complexes from Poly(ethylene oxide)-block-polymethacrylate Anions and N-Alkylpyridinium Cations
Abstract
Complexes from poly(ethylene oxide)- b -poly(sodium methacrylate) (PEO- b -PMANa) and N -alkylpyridinium bromides are water soluble, in marked contrast to those from poly(sodium methacrylate). These systems are studied using potentiometric titration, microcalorimetry, ζ-potential measurement, light scattering and electron microscopy. Three regions ( A − C ) are observed with a complex from PEO- b -PMANa and cetylpyridinuim bromide (C 16 PyBr) when the composition of the mixture ( Z = [C 16 PyBr]/[COO - ]) is varied. (A) At Z < 1 C 16 PyBr binds electrostatically to the polyion to form soluble complex with a negative ζ-potential. (B) The size of the complex decreases and reaches minimum (o.d. 67 nm) at Z = 1 when ζ = 0. Those stoichiometric complexes are soluble and stable. They appear to be micelles with a core formed by C 16 PyBr neutralized polyion chains and a shell of PEO chains. (C) With a further increase in Z, the surfactant cations incorporate in the particles (ζ > 0). The particles formed at saturating concentrations of C 16 PyBr are spherical and remarkably monodisperse. Overall, these systems represent a new class of lyophilic colloids that exhibit combined properties of amphiphilic block copolymers and polyelectrolyte−surfactant complexes.
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Metadata
- Authors
- Bronich, T. K., Kabanov, A. V., Kabanov, V. A., Yu, K., & Eisenberg, A.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 1997-06-01
- Volume
- 30
- Issue
- 12
- Pages
- 3519-3525
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2026015980
- Cited by
- 227
- References
- 0
- FWCI
- 4.64
- Type
- journal article
- Language
- en
- Open access
- closed
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