TERNARY INTERPOLYMER COMPLEXES WITH A LOW -MOLECULAR-MASS MEDIATOR - COMPLEX WITH DIPYRIDYL

The paper describes one representative of the class of ternary interpo lymer complexes with a low-molecular-mass mediator, viz., a complex fo rmed by two polyacids - poly(acrylic acid) and polyphosphate - and dip yridyl. By examining optical density D as a function of pH for aqueous solutions of dipyridyl-poly(acrylic acid) salts, dipyridyl-polyphosph ate salts, and solutions containing all three components [sodium polyp hosphate, poly(acrylic acid), and dipyridyl], it was found that, in th e pH range from 1.15 to 4.9, the reaction between sodium polyphosphate , poly(acrylic acid), and dipyridyl results in an insoluble product, w hich was identified as a true ternary complex, rather than as a mixtur e of dipyridyl salts of the polyacids. This conclusion was supported i n a comparative DSC study of ternary complexes and dipyridyl salts of poly(acrylic acid) and sodium polyphosphate. Taking into account the f act that the ratio of the constituent components in the ternary comple x was independent of the preparation procedure (at a certain pH), the ternary complex was inferred to be an individual chemical compound cha racterized by constant composition.