Poly((N,N,N-trimethylammonio)ethyl acrylate chloride salt) (PCMA)−SDS Complex Formation in Dilute Aqueous Solution. Light Scattering and Time-Resolved Fluorescence Quenching Measurements
| Autor: | Martin Swanson Vethamuthu, Wyn Brown, Johan Fundin |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Quenching (fluorescence)
Molar concentration Aqueous solution Hydrodynamic radius Polymers and Plastics Organic Chemistry Analytical chemistry Concentration effect Polyelectrolyte Inorganic Chemistry chemistry.chemical_compound chemistry Ionic strength Polymer chemistry Materials Chemistry Sodium dodecyl sulfate |
| Zdroj: | Macromolecules. 29:1195-1203 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma950510r |
| Popis: | This paper describes changes in the cationic polyelectrolyte PCMA coil conformation when the anionic surfactant SDS is added in the presence of a simple salt. Four different SDS/PCMA mass concentration ratios (0.074, 0.149, 0.223, and 0.298, corresponding to 0.05, 0.10, 0.15, and 0.20 molar concentration ratios, respectively) have been examined at different NaCl concentrations. Higher ratios than the above give precipitation. When the polyelectrolyte−surfactant complex is formed, the hydrodynamic radius, Rh, is smaller than that for the pure polymer as a result of a combination of electrostatic and hydrophobic interactions. The decrease in Rh on addition of SDS to the PCMA/NaCl solutions is strong even at these low ratios. Inverse Laplace transformation (ILT) of the autocorrelation functions showed that at low salt concentrations there are two modes corresponding to the presence of aggregates (clusters) and the single-coil polymer−surfactant complex. The slow component is distinguished from the analogous ... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|