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Impact of Molecular Architecture on Surface Properties and Aqueous Stabilities of Silicone Based Carboxylate Surfactants.

Silicone surfactants consist of siloxane or carbosilane hydrophobic groups that permite better surface activity compared with alkane surfactants. The surfactants containing Si atom which brings good bond flexibility and low cohesive energy properties are a promising class of materials for special surface working, but few studies address the molecular architecture surface activity mechanisim(s) of these surfactants. To determine different Si bond works on the surface tension, aggregation behavior, and hydrolysis rate, two novel carboxylate surfactants with different silicone hydrophobic groups (Si-O-Si, and Si-C-Si) were synthesized and systematic investigated on the surface activities, aggregates behavior, and solution stabilities. Both surfactants have excellent surface activities that we attribute to the siliconed hydrophobic structure. The hydrolysis resistance of carbosilane based carboxylate surfactant was better than that of siloxane based carboxylate surfactant. The differences of hydrolysis processes for the surfactants were confirmed by mass spectrum and kinetic analysis. Meanwhile, the aggregation number of Si-C-Si surfactant was determined by the fluorescence quenching method for first time.