Premium
Silicon‐modified surfactants and wetting: II. Temperature‐dependent spreading behaviour of oligoethylene glycol derivatives of heptamethyltrisiloxane
Author(s) -
Wagner R.,
Wu Y.,
Czichocki G.,
Berlepsch H. v.,
Rexin F.,
Perepelittchenko L.
Publication year - 1999
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(199903)13:3<201::aid-aoc858>3.0.co;2-5
Subject(s) - chemistry , wetting , wafer , silicon , phase (matter) , derivative (finance) , chemical engineering , phase boundary , liquid phase , ethylene glycol , polymer chemistry , organic chemistry , thermodynamics , nanotechnology , materials science , physics , financial economics , engineering , economics
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. Copyright © 1999 John Wiley & Sons, Ltd.