Surface properties of inclusion complexes between alpha-cyclodextrin and poly(ethylene oxide).
The surface properties of the supramolecular inclusion complex (IC) obtained from the threading of alpha-cyclodextrin (alpha-CD) onto poly(ethylene oxide) (PEO) free in solution are studied. The complexes were characterized by IR, (1)H NMR spectroscopy, and thermal analysis. The variation of the interfacial tension, gamma(int), with inclusion complex (IC) concentration and temperature were determined. The results were compared with those found for PEO under the same conditions. alpha-CD does not present surface activity. To quantify the adsorption process of IC and PEO in aqueous medium, the Gibbs equation was used. The driving force for adsorption of IC at the air/aqueous interface seems to arise from an enthalpic contribution. The wettability of the alpha-CD, PEO, and IC films with two liquids was determined by static contact angle measurements. The hydrophobicity degree was estimated. IC is more hydrophobic than PEO and alpha-CD.
Gargallo
Ligia
L
Departamento Química Física, Facultad de Química, Pontificia Universidad Católica de Chile, 502, Casilla 306, Santiago 22, Chile. lgargall@uc.cl
Vargas
Danitza
D
Leiva
Angel
A
Radić
Deodato
D
D046911:Macromolecular Substances / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry*; D013499:Surface Properties; D013500:Surface Tension; D013696:Temperature; D013816:Thermodynamics; D014867:Water / Q000737:chemistry; D047391:alpha-Cyclodextrins / Q000737:chemistry*
D046911:Macromolecular Substances; D047391:alpha-Cyclodextrins; D014867:Water; D011092:Polyethylene Glycols