Change search
ReferencesLink to record
Permanent link

Direct link
Interfacial films of poly(ethylene oxide)-poly(butylene oxide) block copolymers characterized by disjoining pressure measurements, in situ ellipsometry, and surface tension measurements
KTH, Superseded Departments, Chemistry.
KTH, Superseded Departments, Chemistry.
KTH, Superseded Departments, Chemistry.
2002 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 18, no 13, 5213-5221 p.Article in journal (Refereed) Published
Abstract [en]

Interactions between two air-water interfaces stabilized by poly(ethylene oxide)-poly(butylene oxide) block copolymers were investigated by employing the microinterferometric thin-film balance technique. A series of three block copolymers, two linear diblock copolymers, B8E41 and E106B16, and one linear triblock copolymer, E21B8E21, were investigated. In particular the range of the steric forces operating across the thin foam films was quantified. As expected, higher concentrations, were required of the triblock copolymer than for the diblocks for the formation of a stable foam film. Despite the low polydispersity of the sample (M-w/M-n = 1.03), effects due to polydispersity on the concentration dependence of the disjoining pressure isotherm were noted. Furthermore, the adsorption at the air-water interface was determined by surface tension measurements. It was noted that long equilibrium times are required to obtain (quasi) equilibrium surface tension data. Time-resolved ellipsometry was used to follow the adsorption rates and determine the amounts adsorbed in situ at hydrophobic solid surfaces. The adsorbed amount at the solid-liquid interface determined by ellipsometry was similar to that at the air-water interface estimated from the surface tension isotherm provided polydispersity effects on the surface tension isotherm were taken into account. Moreover, interactions in foam films formed from mixtures of the diblock copolymer, B8E41, and a cationic surfactant, hexadecyltrimethylammonium bromide, were studied. Both electrostatic double-layer forces and, at shorter range, steric forces were present, demonstrating the formation of a mixed layer at the interface.

Place, publisher, year, edition, pages
2002. Vol. 18, no 13, 5213-5221 p.
Keyword [en]
aqueous-solution, foam films, ethylene-oxide, triblock copolymers, association properties, 1, 2-butylene oxide, diblock copolymers, water-interface, adsorption, micellization
National Category
Physical Chemistry
URN: urn:nbn:se:kth:diva-21637DOI: 10.1021/la0118614ISI: 000176376100030OAI: diva2:340335
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2010-10-11Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Rippner Blomqvist, BritaClaesson, Per M.Arnebrant, Thomas
By organisation
In the same journal
Physical Chemistry

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 18 hits
ReferencesLink to record
Permanent link

Direct link