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Home  >  Journal list  >  Polymer Journal  >  Vol.29  No.7 (1997)  >  pp.611-616

Polymer Journal
<<Previous article Vol.29  No.7 (1997)   pp.611 - 616 Next article>>

Conformational and Morphological Changes in Poly(N-vinyl-2-pyrrolidone) Induced by MoCl5

Miriam Lozano1), María Dolores Blanco2), Enriqueta Muñiz3), Rafael Lozano1) and José María Teijón2)
1) Departamento de Quimica Inorgánica y Bioinorgánica, Facultad de Farmacia, Universidad Complutense
2) Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Universidad Complutense
3) Departamento de Biología Celular, Facultad de C.C. Biológicas, Universidad Complutense


ABSTRACT:  The influence of MoCl5 on the conformation and morphology of poly(N-vinyl-2-pyrrolidone) (PVP) was examined in this study. Viscometric, densimetric, solubility, and scanning electron microscopy techniques were carried out. A conformational transition at 75 mM of MoCl5 and so a more compact conformation of PVP was observed. A preferential exclusion of salt from the inside the polymer structure and a preferential adsorption of water was produced. A salting-in behavior was exhibited at all concentrations studied, the binary mixture being thermodynamically unfavourable. Scanning electron microscopy shows changes on polymer structure due to its interaction with the salt, MoCl5 being a nucleating agent for PVP.


Keyword:
Poly(N-vinyl-2-pyrrolidone)/ Molybdenum Pentachloride/ Preferential Interactions/ Unperturbed Dimensions/ Viscometry/ Densimetry/ Scanning Electron Microscopy

Published online: April 01, 2005
© Copyright, 2005 by The Society of Polymer Science, Japan

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