Hydrophobization of the Fumed Silica Surface with Mixtures of Polydimethylsiloxanes and Alkylcarbonates
Keywords:
fumed silica, surface modification, polydimethylsiloxanes, alkylcarbonates, hydrophobic-hydrophylic propertiesAbstract
Surface modification of the fumed silica with polydimethylsiloxanes with different lengths of the polymer chain and alkylcarbonates has been studied. Surface reactions were monitored using IR spectroscopy method. The number of organic groups in the grafted layer of modified silica has been estimated from the data of elemental analysis. The hydrophilic-hydrophobic surface properties of the obtained materials were characterized by microcalorimetric determination of heats of wetting with water and n-decane and by measurements of contact angles of the wetting. A possibility to obtain modified silicas with a high content of grafted organic groups by surface treatment with mixtures of polydimethylsiloxanes and dimethylcarbonate has been shown.References
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