Well-Defined Flexible Polyelectrolytes with Two Cationic Sites per Monomeric Unit
✍ Scribed by Grigoris Mountrichas; Christos Mantzaridis; Stergios Pispas
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 124 KB
- Volume
- 27
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
Summary: Well‐defined flexible, annealed, and quenched polyelectrolytes with two cationic sites per monomeric unit are synthesized. The synthetic scheme involves the synthesis of narrowly distributed poly(p‐tert‐butoxystyrene) precursors by anionic polymerization high vacuum techniques, hydrolysis to poly(p‐hydroxystyrene), and subsequent quantitative functionalization by a Mannich‐type reaction, to yield annealed polyelectrolytes with two dimethylamino groups per monomer. In a last step, the dimethylamino groups are converted into quaternary ammonium salts by reaction with methyl iodide to give high‐charge‐density quenched cationic polyelectrolytes. The polymers are molecularly characterized by NMR and FT‐IR spectroscopy, while their solution behavior is studied by potentiometric titrations, turbidimetry, and fluorescence spectroscopy as a function of pH, in the case of the annealed polyelectrolytes, as well as by viscometry in the case of the quenched polyelectrolytes.
Schematic diagram of the synthesis of the polyelectrolytes.
magnified imageSchematic diagram of the synthesis of the polyelectrolytes.