Abstract
ABSTRACT Synthesis and viscometric behavior of segmented poly(ester-urethane)s in N,N-dimethyl-formamide solution ranged from semidilute to extremely dilute concentration were investigated. The data reflected the conformation changes in the 17–45°C range, and the results are discussed in relation to the behavior of the poly(ethylene glycol)adipate in the same solvent. The intrinsic viscosities and critical concentration that separate the dilute–extremely dilute regimes are also studied. A scanning law between the reduced viscosity ηsp/c and the concentration for the extremely dilute regime is found and the deviations from Huggins dependence at different temperatures are discussed.
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