Abstract
The solution behavior of non-carboxylated and carboxylated polyurethanes (PU) in THF, LiBr/DMF, and DMF was studied by size exclusion chromatography coupled with multiangle light scattering (SEC-MALS). This paper focuses on the association of PU macromolecules in DMF considering the influences of composition, solution concentration, and temperature. The degree of association increases with increasing amounts of polar urethane and carboxyl groups, with decreasing solution concentration, and by increasing the temperature of measurements or heat treatment—all of which demonstrate the role of impurities present in DMF on PU dilute solution behavior.
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