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Influence of the stereoregularity of macromolecules on the process of formation and growth of the system of effective conjugation in polyacrylonitrile

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

Conclusions

  1. 1.

    The peculiarities of the initial step of the process of formation and lengthening of the system of effective conjugation in systems of polyacrylonitrile (PAN), differing in content of isotactic and syndiotactic structures, were studied with the aid of the fluorescence spectra.

  2. 2.

    The presence of isotactic sequences in the chain of PAN creates the most favorable conditions for the formation of polyconjugated systems. Therefore, a large content of isotactic structure induces the growth of longer blocks of effective conjugation in PAN, produced by radiation polymerization in channel complexes of urea (PAN-C), in comparison with PAN produced with a redox system as initiator (PAN-R).

  3. 3.

    The kinetic data in the temperature interval 150–200° indicate that the rate of lengthening of the system of conjugated bonds in PAN-C is considerably higher than in PAN-R.

  4. 4.

    The values of the effective activation energy, as well as the changes in the entropy and enthalpy of the process of increase in the system of effective conjugation in polymers differing in content of the isotactic structure, were calculated.

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Authors and Affiliations

  1. A. V. Topchiev Institute of Petrochemical Synthesis, Academy of Sciences of the USSR, USSR

    Tin Suang Tin, M. A. Geiderkh & B. É. Davydov

Authors
  1. Tin Suang Tin
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  2. M. A. Geiderkh
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  3. B. É. Davydov
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2033–2039, September, 1970.

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Tin, T.S., Geiderkh, M.A. & Davydov, B.É. Influence of the stereoregularity of macromolecules on the process of formation and growth of the system of effective conjugation in polyacrylonitrile. Russ Chem Bull 19, 1911–1916 (1970). https://doi.org/10.1007/BF00849771

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  • DOI: https://doi.org/10.1007/BF00849771

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