The changes in the structural organization of solutions of N,N-dimethylhexadecylammonium salt of the polyamido acid based on 3,3`,4,4`-diphenyltetracarboxylic dianhydride and o-tolidine in a dimethylacet-amide3dioxane mixed solvent during 24-h keeping at room temperature were studied by polarized light scattering. The stability of the salt solutions was studied as influenced by the composition of the mixed solvent, chemical nature of its components, and molecular weight of the polymer.
The structure of mixed amide solvents used for the preparation of polyimide Langmuir-Blodgett films and the structural organization of water, on which nanofilms are formed, have been studied by polarized light scattering. Fluctuation supramolecular structures are found to exist in water and in its mixtures with amide solvents, and the dimensions of the structures are comparable with the light wavelength. When a mixture contains more than 20 vol % water, associates show microanisotropic properties. In snowmelt water, the dimensions of associates are larger than those in distilled water. In the DMAA-water mixture, the dimensions of supramolecular structures are virtually independent of composition.
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