Abstract
In this paper, the morphology of poly(N-vinyl-2-pyrrolidone) (PVP) in the presence of Na2MoO4 has been studied using scanning electron microscopy (SEM). Moreover the poly(N-vinyl-2-pyrrolidone) (PVP)(2)/water(1)/Na2MoO4(3) ternary system has been characterized by viscometry and densimetry. A lattice-like tridimensional structure of PVP due to its interaction with Na2MoO4 is observed. In this ternary system both a preferential adsorption of water at all solvent compositions studied is observed, except at 100 mM of Na2MoO4, concentration at which a preferential adsorption of salt is exhibited. Na2MoO4 behaves as a salting-in agent for the macromolecule, the binary solvent mixture being thermodynamically unfavourable at salt concentrations larger than 10 mM Na2MoO4. © 1997 Elsevier Science Ltd. All rights reserved
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