The effect of mass fraction and molecular weight of segments on the conditions of preparation, structure, and properties
of thermoplastic copolyesterethers (KPEE).
Part I. Synthesis and physicochemical characterization of KPEE differing in mass fraction and molecular weight
In the transesterification and subsequent polycondensation reactions the segmented copolyesterethers containing rigid segments of oligo(tetramethylene terephthalate) and soft segments of oligo(l,4-oxytetramethylene) have been prepared. These KPEE polymers differed in the mass fraction and molecular weight of the individual types of segments. The effect of such conditions of synthesis as time, temperature, pressure, stirring intensity and amount of catalyst (magnesium hydrohexabutoxy-o-titanate) on the course of the individual steps of this synthesis has been investigated. The synthetic procedure has been established to prepare in a reproducible manner KPEE of desired structure. The dependence of intrinsic viscosity, swelling in benzene, content of carboxyl groups and melting point of KPEE on the mass fraction and molecular weight of the individual types of segments has also been determined.
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