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Silicon-modified surfactants and wetting: II. Temperature-dependent spreading behaviour of oligoethylene glycol derivatives of heptamethyltrisiloxane

✍ Scribed by R. Wagner; Y. Wu; G. Czichocki; H. v. Berlepsch; F. Rexin; L. Perepelittchenko

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 114 KB
Volume: 13
Category: Article
ISSN: 0268-2605
DOI: 10.1002/(sici)1099-0739(199903)13:3<201::aid-aoc858>3.0.co;2-5

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✦ Synopsis

The temperature-dependent spreading performance of defined trisiloxane surfactants of the general formula [(CH 3 ) 3 SiO] 2 CH 3 Si-(CH 2 ) 3 (OCH 2 CH 2 ) 3-9 OCH 3 and Silwet L77 on a trimethylsilylated silicon-wafer surface has been investigated. At 6 °C the tetraethylene glycol derivative showed the highest initial spreading rate. At 40 °C the octaethylene glycol derivative was the fastest spreader. It is shown that spreading behaviour and phase behaviour are closely related. The highest initial spreading rates were found for solutions in the two-phase state (2Φ) closely above the liquid-liquid insolubility boundary.

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