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- W200425887 abstract "The chemistry of polycondensation processes has gained a rather rapid development at the present time. All known polycondensation reactions can be combined into two groups: 1) equilibrium and 2) non-equilibrium polycondensation. They differ in the equilibrium constant of the process under investigation. Equilibrium polycondensation includes reactions with kp < 103, reactions with kp< 103 belong to non-equilibrium process. The difference between these two polycondensation types shows up in the properties of the resulting polymers, the mechanism of elementary reactions, the nature and mechanism of catalyst action, the kinetics, the molecular weight distribution, the mechanism of copolycondensation, the structure of copolymers and the like. Various side reactions also occur. As a result, anomalous units are formed in the macromolecule which gives rise to “raznozvenny” (different-unit) polymers. Their structure can be described by the following formula: Download : Download full-size image with M as normal unit and A as anomalous one. Anomalous units and, as a consequence, polymer raznozvennost (different-unit structure) have been shown to present in different classes of polymers prepared by polycondensation methods. Catalysts strongly influence the non-equilibrium polycondensation process. The use of tertiary amines makes it possible to control the structure of the resulting polymers and to produce conformational-specific polymers." @default.
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- W200425887 date "1982-01-01" @default.
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- W200425887 title "ON COMMON TENDENCIES OF NON-EQUILIBRIUM POLYCONDENSATION" @default.
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- W200425887 doi "https://doi.org/10.1016/b978-0-08-026226-0.50006-3" @default.
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