Poly(ethylene oxide)s hydrophobically modified. Adsorption and spreading at the air-water interface

Leiva A.; Urzua, M.; Gargallo, L.; Radic D.

Abstract

A comparative study of spread and adsorbed monolayer of poly(ethylene oxide)s of different molecular weight hydrophobically modified with alkyl isocyanates of different length chain is reported. The modification of the polymer was carried out according to reported procedures. The polymers obtained were studied at the air-water interface by Langmuir isotherms for spread monolayers and by Gibbs isotherms for the adsorption process. Isotherms obtained are interpreted in terms of the hydrophobic and hydrophilic balance of the polymers. Limiting area per repeating unit ( A0) and collapse pressure ( πc) from spread monolayers were obtained. Spread monolayers of the hydrophobically modified polymers show larger collapse pressure values than unmodified polymer monolayers. In the adsorption process the excess surface concentration Γ∞, area per repeat unit σ, and efficiency of the adsorption were determined. The values of the area occupied per repeat unit in adsorbed monolayer (σ) were larger than those of the spread monolayer. The efficiency of the adsorption of poly(ethylene oxide)s increases with the hydrophobic modification and with the alkyl chain length. © 2006 Elsevier Inc. All rights reserved.

Más información

Título según WOS: Poly(ethylene oxide)s hydrophobically modified. Adsorption and spreading at the air-water interface
Título según SCOPUS: Poly(ethylene oxide)s hydrophobically modified. Adsorption and spreading at the air-water interface
Título de la Revista: JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volumen: 299
Número: 1
Editorial: ACADEMIC PRESS INC ELSEVIER SCIENCE
Fecha de publicación: 2006
Página de inicio: 70
Página final: 75
Idioma: English
URL: http://linkinghub.elsevier.com/retrieve/pii/S0021979706000828
DOI:

10.1016/j.jcis.2006.01.063

Notas: ISI, SCOPUS