6533b823fe1ef96bd127f45d
RESEARCH PRODUCT
Interactions of tetradecyldimethylaminoxide with polyacrylic and polymethacrylic acids in aqueous solution
Hans Jürgen HoffmannM. L. Turco LiveriM. L. Turco LiveriF.p. CavasinoCarmelo Sbriziolosubject
Hydrophobic effectViscosityColloid and Surface ChemistryAqueous solutionPulmonary surfactantChemistryHydrogen bondAmphiphilePolymer chemistryMicellePolyelectrolytedescription
Abstract The interactions between the zwitterionic surfactant tetradecyldimethylaminoxide (C14DMAO) and the polyelectrolytes polyacrylic (PAA-205 and PAA-250) or polymethacrylic (PMA-100) acids have been investigated in aqueous solution. The physico-chemical properties of these systems have been monitored by measuring the solution pH, electric birefringence, zero-shear viscosity and density for increasing surfactant concentrations. The experimental results have shown that significant change in the physico-chemical properties of the polyacid/surfactant system occurs only in a narrow pH range and when the amphiphile forms rod-like micelles. Moreover, they clearly reveal the important role played by both hydrogen bonding and hydrophobic forces in governing polyacid–surfactant interactions. The change in the physico-chemical properties of the polyacid solutions upon addition of C14DMAO has been attributed to both the conformational transition of the polyelectrolyte chains and the polyacid/rod-like micelles complex formation. The suggestion is made that the C14DMAO induces a progressive conformational transition in the polyelectrolyte chains much akin to that produced by NaOH.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2001-07-01 | Colloids and Surfaces A: Physicochemical and Engineering Aspects |