Synthesis and Surface Active Properties of Novel Oligomer Betaine Surfactants
2016
Abstract A new type of oligomer
betainesurfactants pentasodium N,N′,N″-alkyl
diethylene triaminepentaacetic acid containing five carboxylate groups, three quaternary ammonium groups and three hydrophobic groups was synthesized by alkaline neutralization reaction and quaternization with
diethylene triaminepentaacetic acid, sodium hydroxide and long chain alkyl bromide as main raw materials. The chemical structures of the prepared compounds were confirmed by FTIR, 1H NMR, MS spectroscopy and elementary analysis. With the increasing length of the carbon chain, the CMC of the synthesized compounds initially decreased. The surface active properties of these compounds were superior to that of the single chain
betainesurfactants rich as decyl dimethyl
betaine. The efficiency of adsorption at the water/
air interface(pC20) of these surfactants was very high. It is found that the shorter hydrocarbon chain length of oligomer
betainesurfactants, the faster the rate of reduction of surface tension, and the bigge...
Keywords:
-
Correction
-
Source
-
Cite
-
Save
18
References
7
Citations
NaN
KQI