COLL 112 |
| Hennady Shulha1, Melburne C. LeMieux1, Sergiy Minko2, Manfred Stamm3, and Vladimir V. Tsukruk1. (1) Department of Materials Science & Engineering, Iowa State University, 2220 Hoover Hall, Ames, IA 50011, (2) Department of Chemistry, Clarkson University, 8 Clarkson Avenue, Potsdam, NY 13699-5810, (3) Department of Physical Chemistry and Physics of Polymers, Institut fuer Polymerforschung Dresden, Hohe Strasse 6, Dresden, 01069, Germany |
| A mixed polymer brush composed of two incompatible polymers, poly(methyl acrylate) (PMA) and poly(styrene-co-2,3,4,5,6-pentafluorostyrene) (PSF) is shown to undergo a rapid switch in mechanical and adhesive properties based on changes in the local environment. Upon exposure to selective solvents, the polymer surface was found to exist in either a “rubbery state” or a “glassy state” with nearly complete vertical reordering of the two components, as verified with surface mapping of the micromechanical properties. A custom built microtribometer with a novel acoustic signal and the capability of operating under solvent exchange conditions showed an in-situ change of the wear characteristics and frictional properties of the binary polymer brush. |
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Friction, Lubrication, and Adhesion in Micro- and Nano-Scale Devices
8:30 AM-12:00 PM, Monday, March 29, 2004 Marriott -- Orange County 5, Oral
Division of Colloid and Surface Chemistry |