Abstract:
It has been shown that there exist conditions under which thermosensitive copolymers
of N-vinylpyrrolidone with methyl acrylate form hydrophobic–hydrophilic associations, which are
unstable dynamic meshes, the bonds in which are continuously broken and created again, and the
nature of the formation of such meshes depends significantly on the proportion of the hydrophobic
component in the copolymer. It is shown that the interaction of the above copolymers with polyacrylic
acid results in the formation of not only classical interpolymer complexes, but also hydrophilic
interpolymer associates, which also represent unstable networks existing in a dynamic mode. In such
meshes, the molecules of the above copolymers serve as a kind of cross-agent connecting the polyacid
molecules. There are also conditions under which such meshes acquire a complex structure, since
unstable bonds between macromolecular tangles of both the same and different types take part in
their formation. It is shown that the transition from the formation of interpolymer complexes to the
formation of hydrophilic interpolymer associates can occur, among other things, due to changes in
the acidity or concentration of low-molecular salt in solution.
