A dipole moment and conformations of poly-N-vinylpyrrolidone and of its complex with C60 fullerene in aqueous solutions

The study of temperature dependences of dipole moments and conformational properties of poly-n-vinylpyrrolidone (PVP) and polymer complex of PVP with c60 fullerene (PVP + fc60) was carried out in dilute aqueous solutions at 293-313 K. It was shown that dipole moment values for PVP and PVP + fc60 were 24-32 d and 18 d, correspondingly. The presence of the molecular group -n-c=o in each monomer unit near the macromolecule backbone promotes the formation of helical blocks in macromolecular coils. In external electric field, the non-alternating projections on the direction of this field and on the vectors connecting the neighboring segments of the macromolecule appear. It was demonstrated that the changes in the characteristics of the dielectric polarization could be explained by structuring in the coils of PVP and PVP + fc60 in aqueous solutions.