(1) Dpartment of Applied Chemistry, Faculty of Engineering, Osaka University, Yamadaoka 2-1, 565 Suita, Osaka, Japan
Abstract:
New compounds bearing two dihydrogen phosphate groups and two long- chain alkyl groups (octyl or decyl) were prepared in good
yields by the reaction of 1,ω-bis(alkyloxymethyl)- oligo (ethylene glycol)s with polyphosphoric acid.
Amphipathic di- or tetrasodium phosphates were obtained by neutralization of the free acids with sodium hydroxide, and their
surface- active properties in water were measured. Almost all these di- or tetrasodium phosphates showed good water solubility.
Their abilities to form micelles and to lower surface tension were fairly good as compared with general monoalkyl phosphates
consisting of one longer alkyl chain and one hydrophilic group. The foaming property of aqueous solutions of the tetrasodium
salts was different from that of the disodium salts. The former showed very low foaming ability.