Interactions of aminoalkylcarbamoyl cellulose derivatives and sodium dodecyl sulfate. 2. Foam stabilization

We have compared the interactions between polyquaternium 10 and sodium dode cyl sulfate with similar complexes of mono and diquaternary ammoniumalkylca rbamoyl cellulose derivatives by measuring the foaming efficiency and foam stability of their aqueous solutions. At approximately a 1:1 stoichiometric ratio of sodium dodecyl sulfate (SDS) to quaternary groups, an insoluble p recipitate began to form. Maximum foamability and foam stabilization were o bserved in systems close to the 2 dimensional phase boundary between solubl e polymer-surfactant complexes and insoluble complexes. Foaming studies ind icated that for a given amount of sodium dodecyl sulfate, the most kinetica lly stable foam was obtained using a monoquaternary polymer. The addition o f a second cationic charge on the grafted polymer substituents apparently d estabilized the foam. (C) 1999 Elsevier Science B.V. All rights reserved.