STRUCTURAL APPLIED FIELD-INDUCED METASTABILITY OF THE COMPOSITIONS BASED ON POLYVINYL ALCOHOL,ORTHOPHOSPHORIC ACID, AND VARIABLE-VALENCE METALS

摘要

The conditions of formation of the hybrid-organic complexes based on polyvinyl alcohol, variable-valence metals, and orthophosphoric acid (PVA - H_3PO_4, PVA - Cu~(2+), PVA - Co~(2+), PVA - Cu~(2+) - H_3PO_4, PVA - Co~(2+) - H_3PO_4) sensitive to electric and magnetic fields are determined by the rheological method with regard for electrophysical properties. Evaluation is made of an influence of the type and concentration of the used components on the properties and structure of the complexes. An influence of a magnetic field on rheological properties of the compositions is determined, the flow curves, concentration and temperature dependences of viscosity are obtained. Some structural features of the PVA - Cu~(2+) -H_3PO_4 films are specified by the dielectric relaxation method and a change in electric, sorption properties in the presence of a d.c. electric field is determined. The optimal fluid and film compositions sensitive to external factors are found. An assumption is made that the metastability induced by the applied field is associated with the formation of a liquid-crystalline phase.