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On the amplitude of molecular motion and mechanism of relaxational processes in polymers

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Summary

The activation volumes of α and β relaxational processes in polymers have been studied on the basis of data obtained through thermally stimulated depolarization technique. Both relaxational processes were shown to be caused by the motion of the same kinetic elements of macromolecules, comprising 2–10 monomeric units. A correlation found between the activation volumes of relaxational processes and the charges isolated upon thermally stimulated depolarization of polymers is discussed. It was concluded that the correlation is due to the difference in the amplitudes of rotational motion of kinetic elements of macromolecules. The rotational motion of segments at T<Tg occurs within the cone with an apex angle not exceeding 10–15°. Devitrification of the polymer is accompanied by a structural rearrangement which leads to a sharp increase in the amplitude of rotational motion, which manifests itself as α — relaxational process.

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Authors and Affiliations

  1. Institute of Chemical Physics, Academy of Sciences of USSR, V-334, Moscow, USSR

    A. L. Kovarskii & S. A. Mansimov

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  1. A. L. Kovarskii
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  2. S. A. Mansimov
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Kovarskii, A.L., Mansimov, S.A. On the amplitude of molecular motion and mechanism of relaxational processes in polymers. Polymer Bulletin 21, 613–619 (1989). https://doi.org/10.1007/BF00264143

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