Synthesis and Properties of Novel Double-Tail Trisiloxane Surfactants with High Spreading Ability.

Autor: Peng, Zhongli, Huang, Shangfu, Cao, Meina
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Zdroj: Journal of Surfactants & Detergents; Aug2011, Vol. 14 Issue 4, p521-528, 8p
Abstrakt: A new type of double-tail trisiloxane surfactants of the general formula RNRCHCH(OH)CHO(CHCHO) xCH ( x = 8.4, 12.9, 17.5, 22; R = MeSiOSiMe(CH)OSiMe, R = CHCH(OH)CHOR, R = CHCH(CH)CH(CH)CH) has been synthesized by reacting single-tail trisiloxane surfactants with 2-ethylhexyl glycidyl ether. Their structures were characterized with H-NMR and C-NMR spectroscopy. These double-tail trisiloxane surfactants reduce the surface tension of water to less than 24 mN/m at a level of 10 mol/L. The spreading ability (SA) of the double-tail trisiloxane surfactant solution on Parafilm (or Ficus microcarpa leaf) surfaces is better than that on polyethylene terephthalate surface. The SA of the solution of the double-tail trisiloxane surfactants 1J with average ethoxy units of 8.4 is far better than the others, and its solution (5.0 × 10 mol/L) possesses an SA value of over 15 within 10 min on Parafilm and Ficus microcarpa leaf surfaces. The surface tension values of aqueous solutions (1.0 × 10 mol/L) of the double-tail trisiloxane surfactants 1J are still less than 25 mN/m over 21 days in an acidic environment (pH 4.0) and 139 days in an alkaline environment (pH 10.0), respectively. It is suggested that the SA and hydrolysis resistance of double-tail trisiloxane surfactants are able to be improved by changing the structure of the hydrophobic group, such as increasing the molar ratio of methyl to methylene. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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