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    Surface properties of siloxane-based surfactants containing tromethamol units

    Year: 2011

    Journal: Revue Roumaine de Chimie 2011, 56 (10-11) pp 941-946, 20121211

    Authors: Carmen RACLE, Mihaela ALEXANDRU, Alexandra NISTOR, Maria CAZACU

    Organizations: Petru Poni Institute of Macromolecular Chemistry, 41A Aleea Gr. Ghica Voda, 700487 Iasi, Roumania

    New siloxane-based amphiphilic compounds: a dimmer and two copolymers with pendant functional groups have been synthesized starting from tris(hydroxymethyl)aminomethane (tromethamol) and glycidyl-functionalized siloxane precursors. These new compounds were designed as an alternative to carbohydrate-modified siloxane surfactants, which are more difficult to obtain. The water soluble compounds (a dimmer and a copolymer with 1.5/1 dimethyl/ hydrophilic group ratio) exhibited typical surfactant behavior. Low CMC values and equilibrium surface tensions were detected by tensiometry. Very good wetting behavior towards glass and silicone elastomer was observed by dynamic contact angle measurements. Due to their structure, these surfactants could be used for improving surface properties of contact lenses. Preliminary tests showed good coverage of the surface and transparency. Dynamic vapor sorption (DVS) experiments showed improved dehydration behavior of the treated material.