Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 208, Issue 19-20, Pages 2134-2144Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.200700122
Keywords
coffee-stain effect; drop evaporation; ink-jet; poly (ethyl methacrylate); polystyrene (PS); polymer surfaces
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When a solvent drop evaporates from a polymer surface, a characteristic structure remains. To analyze the structure formation during evaporation we deposited microdrops of ethyl acetate on planar PEMA and toluene on PS. The shape of the evaporation structures depends on the molar mass of the polymer, the number of droplets deposited, and the specific polymer/solvent combination. Crater-like structures with a flat bottom were observed for PEMA. With PS, dot-like protrusions were observed for low and intermediate molar masses; for M-w >= 210 kDa, crater-like rims with a depression in the center were formed. These structures are interpreted based on four different processes occurring during evaporation.
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