Abstract
The authors synthesized cationic surfactants containing dimethylpolysiloxane whose hydrophobic groups were linear, two-chained and three-chained, and investigated their surface activities.
Regardless of the structure of hydrophobic groups, these cationic surfactants indicated excellent surface activities to give the lowest values of surface tension in aqueous solutions, as low as 22 to 23 dynes/cm. But they lost their surface activities in acidic (pH<4.5) and basic (pH>9.5) aqueous solutions.
They also indicated excellent foaming ability and foam stability, and are expected to have a utility as foaming agents.
In respect to the bacteriostatic action, the cationic surfactants
(CH3CH2CH2CH2) 3M (CH2) 3N+ (CH3) 3Cl- (M=Si, Sn)
indicated especially strong activities.
