Interactions between Langmuir–Blodgett Polymer Monolayers Studied with the Surface Force Apparatus

Tsarkova, L. A.; Protsenko, P. V.; Klein, J.
January 2004
Colloid Journal;Jan/Feb2004, Vol. 66 Issue 1, p84
Academic Journal
Langmuir–Blodgett monolayers from end-functionalized polyisoprene (PI–X) were studied in a surface force apparatus (SFA) as a model of a highly stretched brush melt. After deposition on a freshly cleaved mica, two identical brush monolayers (with surface area per molecule of about 170 Å2) were brought into adhesive contact in the SFA; then kinetic changes in the film thickness and the topography of the contact were continuously monitored. We observed spontaneous thinning of the brush melt bilayer. This effect can be attributed to the enhanced lateral motion of the sticking end-groups under the “contact induced pressure.” The possible model describing kinetic changes in the film thickness is presented. The behavior of the two opposing brush melts and a single brush monolayer in contact with two mica surfaces was compared. Molecular mechanisms involved in the rearrangements of brush melts are proposed for both systems.


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