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Stereoisomerism in polyesters and polyamides

  • Published:
Bulletin of the Academy of Sciences of the USSR, Division of chemical science Aims and scope

Summary

  1. 1.

    A simplified method for preparing macromolecular polyesters from dicarboxylic acids and glycols with azeotropic removal of water was developed. This method is applicable to the preparation of optically active and racemic polyesters. Three pairs of optically active and racemic polyesters were prepared, and also the polyamide from 3-methylhexanedioic acid and 1, 6-hexanediamine was prepared in the optically active and racemic forms.

  2. 2.

    It was shown that the density of the (+)-polyamide is greater than that of the racemic polyamide of the same composition and the melting point of the (+)-polyamide is the higher by 15–30°. The difference in the densities of the optically active and racemic polyesters is insignificant. It was nevertheless found that the difference in vitrification temperature is appreciable: optically active polyesters vitrified. at temperatures 4–8° above those for racemic polyesters of the same composition.

  3. 3.

    Direct experiments showed that the stereochemical structure of a macromolecular compound has a substantial effect on the way in which the chain molecules are packed in the polymer and therefore on the density and melting and softening points.

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Authors and Affiliations

  1. Institute of Heteroorganic Compounds of the Academy of Sciences of the USSR, Russia

    Zh. S. Sogornonyants & M. V. Volkenshtein

Authors
  1. Zh. S. Sogornonyants
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  2. M. V. Volkenshtein
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Sogornonyants, Z.S., Volkenshtein, M.V. Stereoisomerism in polyesters and polyamides. Russ Chem Bull 6, 623–630 (1957). https://doi.org/10.1007/BF01169280

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  • DOI: https://doi.org/10.1007/BF01169280

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