Preferential Adsorption Phenomena in Polyelectrolytes in Methanol/Water Solution: Effect of the Counterion

✍ Scribed by Barraza, Raúl G.; Peña, María L.; Ríos, Hernán E.

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 248 KB
• Volume: 42
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199701)42:1<112::aid-pi664>3.0.co;2-j

✦ Synopsis

The preferential adsorption behaviour of nitrate and chloride salts of poly(N,N-dimethyl-N-(2-hydroxypropyl)ammonium) in solutions of methanol/ water mixtures is analysed. At low methanol content both polyions show an adsorption of methanol which is 2É5 times larger for chloride polyion than that for nitrate salt. In the former case, the amount of methanol adsorption is enough to produce an important change in the average distances between charges. This change induces an anomalous behaviour of the conductimetric interaction parameter with solvent composition. This e †ect is not observed in the case of nitrate polyion and the trend of the conductimetric interaction parameter correlates well with the nature of the medium. This e †ect is attributed to the low methanol adsorption in this case.