New amphoteric surfactants containing a 2‐hydroxyalkyl group VIII. Synthesis and surface activities for amphoteric oligomeric or polymeric surfactants of β‐alanine type

Abstract

AbstractA series of amphoteric oligomeric and polymeric surfactants of poly(iminoethylene) (PIE) containing both a 2‐hydroxyalkyl group (C12‐HA or C14‐HA) and a 2‐carboxyethyl (CE) group as N‐substituents was studied as follows: PIE having 1,000 or 20,000 molecular weight was treated with 1,2‐epoxydodecane or 1,2‐epoxytetradecane and subsequently methyl acrylate. The adducts were saponified to obtain amphoteric oligomeric surfactants (AO) or amphoteric polymeric surfactants (AP), poly{[N‐(2‐carboxyethyl)‐N′‐(2‐hydroxyalkyl)]iminoethylene}. Various adducts of which the ratios of CE/HA for one unit of iminoethylene group are 2, 3.5, 8, 17 and 89 were synthesized.Surface activities such as surface tension, solubilization of orange OT, and foaming power, and physicochemical properties such as turbidity, isoelectric point, and the dissociation constant, were studied. Particular attention was paid to the dependence of solubilization, viscosity and turbidity on pH value.