Abstract
The polymerization conditions have a strong influence on the properties and time-dependent behavior of a sessile water drop on polymer films. For a given copolymer composition, the recipe components of emulsion copolymer films clearly influence the initial static water contact angle. Common emulsifiers such as sodium dodecyl sulfate lead to lower contact angles than poly(ionic liquid) dispersions which are a new class of stabilizers for emulsion polymerization. In contrast to the static contact angle, the time-dependent properties of the water contact angle reflect the particular conditions during the polymerization. It is a general conclusion of this study that waterborne emulsion copolymers show a distinctly different time-dependent behavior of the contact angle than bulk polymers of the same molecular composition regardless of the initial static contact angle.
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