Silsesquioxane-Based Amphiphiles
Langmuir1999Vol. 15(14), pp. 4752–4756
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Abstract
A novel type of amphiphilic spherosilsesquioxane derivative, 1-(1,ω-propylenemethoxy)oligo(ethylene oxide)-3,5,7,9,11,13,15-heptahydridopentacyclo[9.5.13,9.15,15.17,13]octasiloxane has been prepared from (HSiO3/2)8 and allyl-functional oligo(ethyleneoxide) (Mn = 750 g/mol) by hydrosilylation. The monosubstituted octahydridosilsesquioxane was characterized by 1H, 13C, and 29Si NMR spectroscopy, IR, and MALDI-TOF mass spectroscopy as well as elemental analysis. Surface tension measurements of the water-soluble amphiphile show a cmc in the range of 6 × 10-4 mol/L. Aggregation of the uncondensed amphiphile leads to micellar and vesicular structures that can be cross-linked to liposome-like silica particles at elevated pH.
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