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Viscometric Study of Poly(Ester Urethane) Solutions: 3 Influence of Chemical Structure on the Conformational Transition

This article presents a comparative study of the intrinsic viscosity of segmented poly(ester urethane)s obtained from aromatic diisocyanates with poly(ethylene glycol)adipate and thiodiglycol or diethylene glycol as chain extenders, using a multistep polyaddition process. The data allow the determination of changes in the conformation of the polyurethanes in N,N-dimethyl formamide at 20-45 °C, which are discussed in relation to the behavior of the poly(ethylene glycol)adipate in the same solvent and as a function of the soft and hard segment composition.