- Hybrid organic-inorganic gels containing perfluoro-alkyl moieties
-
Perfluoroalkyltrialkoxysilanes were prepared by hydrosilylation of the allylic or vinylic derivatives with trialkoxysilane or with trichlorosilane (followed by a quantitative methanolysis). The hydrolysis and polycondensation of these precursors were performed in the presence of tetrabutylammoniumfluoride (TBAF) as the catalyst, leading to a series of new polysilsesquioxanes, which were characterized by solid state 13C and 29Si CPMAS NMR. The porosity and surface area of these materials were determined by N2 absorption experiments. Thermogravimetric analyses (TGA) were also performed. The surface properties of films prepared from these silsesquioxanes were studied by contact angle measurements. The hybrids having fluoroalkyl groups at the surface of the material showed a better thermostability and a higher hydrophobic and oleophobic character than their hydrocarbon analogues.
- Ameduri, Bruno,Boutevin, Bernard,Moreau, Jo?l J.E.,Moutaabbid, Hicham,Chi Man, Michel Wong
-
p. 185 - 194
(2007/10/03)
-
- Syntheses and Reactions of Metal Organics. XVIII. Syntheses of (1H,1H,2H,2H-Polyfluoroalkyl)trimethoxysilanes and Surface Modification of Glass Plate
-
Four silane coupling agents, (1H,1H,2H,2H-polyfluoroalkyl)trimethoxysilanes ((1H,1H,2H,2H-henicosafluorododecyl)trimethoxysilane, C10F21C2H4Si(OCH3)3, (1H,1H,2H,2H-heptadecafluorodecyl)trimethoxysilane, C58F17C2H4Si(OCH3)3, (1H,1H,2H,2H-tridecafluorooctyl)trimethoxysilane, C6F13C2H4Si(OCH3)3, and (1H,1H,2H,2H-nonafluorohexyl)trimethoxysilane, C4F9C2H4Si(OCH3)3), were prepared by the hydrosilylation of trichlorosilane with the corresponding 1H,1H,2H,-polyfluoro-1-alkene in the presence of hydrogen hexachloroplatinate-(IV), followed by reaction with sodium methoxide.The surface modification of glass plate was attempted using these products.From measurements of the contact angles θ (deg) of water and oleic acid against a modified glass plate surface, the coupling agents were found to have high modification ability.The modification produced a glass surface with high oxidation resistance.
- Yoshino, Norio,Yamamoto, Yasushi,Hamano, Katsumi,Kawase, Tokuzo
-
p. 1754 - 1758
(2007/10/02)
-
- Darstellung von Polyfluororganotrichlorsilanen
-
The following substances could be prepared by Grignard reactions or by conversions with trichlorosilane: C6F5CH2CH=CH2, C6F5(CH2)3SiCl3, CF3(CF2)9CH2CH=CH2, CF3(CF2)7(CH2)2SiCl3, CF3(CF2)11(CH2)3CH=CH2 and CF3(CF2)11(CH2)5SiCl3.They were characterized by spectroscopical and microanalytical methods.
- Haas, Alois,Koehler, Juergen
-
p. 531 - 538
(2007/10/02)
-
