DIRECT MEASUREMENT OF SHEAR FORCES BETWEEN POLYMER-BEARING SURFACES SLIDING PAST EACH OTHER

Citation
J. Klein et al., DIRECT MEASUREMENT OF SHEAR FORCES BETWEEN POLYMER-BEARING SURFACES SLIDING PAST EACH OTHER, Macromolecular symposia, 98, 1995, pp. 1149-1158
Citations number
16
Categorie Soggetti
Polymer Sciences
Journal title
ISSN journal
10221360
Volume
98
Year of publication
1995
Pages
1149 - 1158
Database
ISI
SICI code
1022-1360(1995)98:<1149:DMOSFB>2.0.ZU;2-G
Abstract
We have used a recently developed surface force balance to measure, wi th extreme sensitivity, both lateral and normal forces between interac ting surfaces, for the case of simple liquids and particularly with su rface-attached polymers. The presence of polymers on the surfaces redu ces drastically the force required to maintain them in sliding motion, under a given normal load, relative to the bare surface case. We beli eve this is due to the long range steric repusion which can sustain a large normal load while maintaining a very fluid interfacial layer. Th e effect is much more marked for end-tethered chains in a good solvent than for adsorbed chains in a theta-solvent. This is attributed to th e different extents of interpenetration of the compressed polymer laye rs.