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Healing of adsorbed polymer layers in a narrow gap following removal by shear
Author(s) -
Raviv Uri,
Klein Jacob
Publication year - 2002
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.236
Subject(s) - adsorption , polymer , materials science , shearing (physics) , ethylene oxide , surface forces apparatus , mica , shear force , oxide , chemical engineering , shear (geology) , solvent , diffusion , layer (electronics) , composite material , copolymer , organic chemistry , thermodynamics , chemistry , physics , engineering , metallurgy
Abstract The shear and normal forces between layers of poly(ethylene oxide) (PEO), of molecular weights M w = 37 kg/mol adsorbed onto smooth, curved solid (mica) surfaces across the good solvent toluene have been determined using a surface force balance (SFB). The equilibrium F n ( D ) profiles are closely similar to those measured in earlier studies between adsorbed PEO layers. The shearing motion causes the removal of polymer from within the intersurface gap during sliding. The recovery of the adsorbing layer has been measured and the amount of adsorption with time was calculated. Our findings showed that there is no migration of polymers on the surfaces and that the recovery of the layer is controlled by the rate of diffusion of polymer chains into the gap. Copyright © 2003 John Wiley & Sons, Ltd.