POLYMER SURFACTANT FILMS AT THE AIR-WATER-INTERFACE .1. SURFACE PRESSURE, ELLIPSOMETRY, AND MICROSCOPIC STUDIES

Citation
Ek. Mann et al., POLYMER SURFACTANT FILMS AT THE AIR-WATER-INTERFACE .1. SURFACE PRESSURE, ELLIPSOMETRY, AND MICROSCOPIC STUDIES, Macromolecules, 26(25), 1993, pp. 7037-7045
Citations number
54
Categorie Soggetti
Polymer Sciences
Journal title
ISSN journal
00249297
Volume
26
Issue
25
Year of publication
1993
Pages
7037 - 7045
Database
ISI
SICI code
0024-9297(1993)26:25<7037:PSFATA>2.0.ZU;2-V
Abstract
Mixed films formed by an insoluble polymer, poly(dimethylsiloxane) (PD MS), placed on the surface of aqueous solutions of two different solub le surfactants are studied by a variety of different methods: surface tension isotherms, ellipsometry complemented by the neutron reflectivi ty experiments presented in part 2, and direct observations of the sur face via the Brewster angle microscope. A vertical separation into sup erimposing surfactant and polymer layers is exhibited, with mixing bet ween the layers depending on the surfactant. On one but not the other of the surfactant solutions studied, a lateral separation of the polym er monolayer is also observed, into domains similar to those previousl y observed on pure water. The collapse of the monolayer into a three-d imensional state with increasing polymer concentration occurs more smo othly than on water.