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Silicon-modified surfactants and wetting: III. The spreading behaviour of equimolar mixtures of nonionic trisiloxane surfactants on a low-energy solid surface

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

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 139 KB
Volume: 13
Category: Article
ISSN: 0268-2605
DOI: 10.1002/(sici)1099-0739(199909)13:9<621::aid-aoc885>3.0.co;2-a

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✦ Synopsis

The spreading behaviour of binary and ternary equimolar mixtures of siloxane surfactants of general formula [(CH 3 ) 3 SiO] 2 CH 3 Si(CH 2 ) 3 (OCH 2 CH 2 ) n OCH 3 , n = 3-9, has been investigated. The mixtures show a pronounced temperature dependence on the initial spreading rate. Mixtures imitating the average oligoethylene glycol chain length n = 5 are the fastest spreaders at 15 °C. At 23 °C and 40 °C these mixtures spread fastest sucking n = 6 and n = 8, respectively. For a given average chain length an increasing length difference between the components of the binary mixtures reduces the initial spreading rate. Nevertheless, substantial differences between the phase transition temperature T c from the lamellar phase (L a ) into the twophase state (2Φ) and the actual spreading temperature are tolerated. A clear relation between phase transition temperature T c and initial spreading rate does not exist.

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