Volume 19 (1970) Issue 4 Pages 245-251
Authors have recently reported a series of surfactants containing silicon. In this report the syntheses of nonionic and cationic surfactants with three-chained hydorophobic groups containing tin or silicon, which are represented by the following formulae (1) and (2), are described.
R3M (CH2) 3O (CH2CH2O) nH (1)
(M=Sn, Si; R=CH3, CH3CH2CH2CH2)
(CH3CH2CH2CH2) 3M (CH2) 3N+ (CH3) 3·Cl- (2)
Then, some of their properties were compared with each other.
Also, authors synthesized new nonionic and cationic surfactants containing siloxane bonds, which are represented by the following formulae (3) and (4), and compared some of their properties with those of above-mentioned surfactants.
[(CH3) 3SiO] 3Si (CH2) 3O (CH2CH2O) nH (3)
[(CH3) 3SiO] 3Si (CH2) 3N+ (CH3) 3·Cl- (4)
In the case of nonionic surfactants, surface tension of their solutions and interfacial tension between the solutions and kerosene oil, and in the case of cationic surfactants, surface tension of their solutions, were determined. As a result, the surfactants containing tin were found to have as strong surface activities as those of the surfactants of same type containing silicon. Among the surfactants with three-chained hydrophobic groups, the nonionic and cationic surfactants containing siloxane bonds were characterized by their ability to depress the surface tension of water down to as low as 2223 dynes per cm.