Interactions of Poly(vinylpyrrolidone) with Dodecylammonium Salts in Aqueous Solution

Abstract

The interactions between dodecylammonium salts and poly(vinylpyrrolidone) in aqueous solution were studied by means of the measurements of viscosity, electrical conductivity and equilibrium dialysist.
The viscosity and conductivity data indicate that an associatien complex is formed between dodecylammonium thiocyanate or iodide and the polymer, The thiocyanate binds strenger than theiodide to the polymer. Doclecylammonium bromide and chtoride do not bind to the polymer judging from the data of the reduced viscosity of the polymer solutioninthe presence of these salts. The binding is slight for tetrabutylammonium iodide, and no detectable binding for tetrabutylammonium bromide, cetykrimethylammonium bromide and potassium iodide was observed.
It is concluded that for alkylammenium salts the more the anions have strong water-structure-breaking effectandthe cations are hydrophobic, the more they bind onto poly(vinyl-pyrrolidone).