FEATURES OF THE CHROMATOGRAPHIC BEHAVIOR OF MACROMOLECULES IN BINARY ELUENT

Behavior of macromolecules during chromatography in binary eluents und er various conditions (in size-exclusion, adsorption, and critic modes ) were considered by the example of poly(phenylenesulfones) of various molecular masses and with various end groups. The molecular-mass dist ribution of poly(phenylenesulfone) fractions having molecular mass bet ween 1.5 and 6.0 x 10(4) was studied in chloroform-heptane and chlorof orm-tetrachloromethane solvent mixtures, where one of the components p erforms as a precipitating agent for the polymer. The mechanism of sep aration of macromolecules on alkylated silica gel according to their s ize was discussed. The critical conditions were selected for analysis of functionality-type distribution of end groups in macromolecular com pounds.