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Silicon-Modified Carbohydrate Surfactants V: The Wetting Behaviour of Low-Molecular-Weight Siloxane, Carbosilane, Silane and Polysilane Precursors on Low-Energy Surfaces

✍ Scribed by R. Wagner; L. Richter; Y. Wu; J. Weißmüller; J. Reiners; E. Hengge; A. Kleewein; K. Hassler

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
157 KB
Volume
11
Category
Article
ISSN
0268-2605

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✦ Synopsis

The surface tensions, wetting tensions, contact angles and solid/liquid interfacial tensions of defined siloxanes as well as those of analogous carbosilanes, polysilanes and neopentyl substituted silanes were determined. The wetting experiments were carried out on a glass plate coated with perfluoroalkyl methacrylate (FC 722 ® ). The siloxanes possess the lowest surface tensions. Due to the presence of oxygen atoms in the siloxane backbone, a donor-acceptor portion (␥ + / Ϫ lv ) of the surface tension of about 1-2 mN/m was determined. The solid/liquid interfacial tension also contains a donor-acceptor portion (␥ + / Ϫ sl ). Its value is almost identical to that of ␥ + / Ϫ lv . The ␥ + / Ϫ sl differences between individual molecules of the same surface tension are responsible for contact angle differences of up to 4°.

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