FUNCTIONALITY DISTRIBUTION OF POLY(BUTYLE NEGLYCOL ADIPINATES) AS MEASURED BY LIQUID-CHROMATOGRAPHY UNDER CRITICAL CONDITIONS

Oligomeric linear poly(butyleneglycol adipinates) have peen partitione d with respect to the number of terminal hydroxy groups in a macromole cule. The analysis was carried out by high-performance liquid chromato graphy under critical conditions near the point of the coil-adsorbed c oil transition. The critical regime, in which the molecules exhibit vi rtually no partition with respect to their dimensions, was attained by using standard chromatographic columns Lichrosphere-Si 100, Zorbax-NH 2, and Zorbax-Golden and a heptane-methyl ethyl ketone binary solvent. The data on the content of non-, mono-, and bifunctional molecules in the oligomers were extracted.