THERMODYNAMIC PROPERTIES OF INTERPOLYMERIC COMPLEXES ON THE BASIS OF SODIUMAROXYMETHYL CELLULOSE
The sorption properties of interpolymer complexes based on Na-CMC with UFOs and initial components are studied. The sorption properties of interpolymer complexes and polycomplex composites based on Na-CMC and UFOs, as well as their constituent components, were studied using the Mac-Ben sorption unit. The thickness of the films for sorption studies was 60-80 microns. The integral heats of dissolution and swelling of individual starting polymers and their mixtures in water were measured using a DAK-1-1A differential automatic microcalorimeter. The starting product Na-CMC has the highest sorption capacity, and the polycomplex of the stoichiometric composition Na-CMC- UFOs has a smaller value compared to Na-CMC. Such a change in the sorption capacity is apparently due to the compaction of the polycomplex structure and the increase in the packing density of macromolecules consisting of chains of polymer components of different chemical nature, and their affinity for each other, as well as for the solvent. The calculated theoretical values ??of the isotherm of sorption of water vapor for polycomplexes and initial components in good agreement with experimental data. The results of thermodynamic properties show that the complexation of Na-CMC with UFOs is accompanied by negative changes in bias, which is an important condition for thermodynamic compatibility indicating the formation of hydrogen and ionic bonds between the interacting components.