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Probing Polymeric Stabilization in Nonaqueous Media by Direct Measurements
Author(s) -
Bergström Lennart,
Blomberg Eva
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01174.x
Subject(s) - polymer , decalin , materials science , adsorption , scaling , layer (electronics) , rheology , dispersant , composite material , steric effects , range (aeronautics) , chemical physics , chemical engineering , dispersion (optics) , chemistry , optics , organic chemistry , physics , geometry , mathematics , catalysis , engineering
The steric repulsion induced by adsorbed layers of the commercial dispersant Hypermer KD3 has been probed by direct measurements in decalin. The forces are long range (commencing at 30–40 nm) and repulsive, and the distance dependence can be modeled with a simple scaling theory expression valid for polymer brushes. We obtain layer thicknesses of ∼9–15 nm for the compressed layers, depending on KD3 concentration, whereas the undisturbed layers have a thickness of ∼23–24 nm, independent of polymer concentration. Comparison of the measured interaction lengths with previous layer thickness estimates based on rheological studies shows that the polymer layers are compressed in dense suspensions.