| 초록 |
Brush formation with polyelectrolytes is a popular area of research due to its fundamental importance. In particular, the structures of the polyelectrolyte brush in liquid media can be dramatically tuned by controlling the grafting density, chain length, salt concentration, pH, etc. We have characterized the structures of brushes of randomly charged polystyrene sulfonated acid (PSSA) in various aqueous solutions by using neutron reflectivity. The overall thickness of the PSSA brush in the dry state was ~4.5nm. The responsive structure of the polymer brush was studied at different pH and NaCl concentration. We have found that there has been a responsive structural behavior with different pH and salt, however sulfonic acid is strongly dissociated in aqueous solution. This behavior is able to suggest degree of strong electrolyte group effect on the pH values. |
