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Silicon‐modified surfactants and wetting: IV. Spreading behaviour of trisiloxane surfactants on energetically different solid surfaces
Author(s) -
Wagner R.,
Wu Y.,
Berlepsch H. v.,
Perepelittchenko L.
Publication year - 2000
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/(sici)1099-0739(200004)14:4<177::aid-aoc974>3.0.co;2-p
Subject(s) - chemistry , wetting , polar , ethylene glycol , solid surface , surface energy , hexa , silicon , chemical engineering , polymer chemistry , chemical physics , organic chemistry , crystallography , engineering , physics , astronomy
The spreading behaviour of defined trisiloxane 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) on five different solid surfaces has been investigated. Maximum spreading areas and rates are found on non‐polar or slightly polar surfaces of 30 to 40 mN m −1 surface energy. Extremely low or high surface energies substantially reduce the spreading rates. On non‐polar surfaces rapid spreading is observed for 1 wt % solutions of the relatively short‐chained penta‐ and hexa‐ethylene glycol derivatives. On slightly polar surfaces dilute 0.1 wt % solutions of longer‐chained derivatives spread faster. This spreading pattern shift coincides with a change of the phase behaviour. Solutions of Silwet L77 do not prefer one specific surface, since 1 wt % solutions abruptly stop spreading after a few seconds and the maximum spreading rates are found for 0.1 wt % solutions. Therefore, Silwet L77 essentially belongs among the long‐chained derivatives. Copyright © 2000 John Wiley & Sons, Ltd.