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Orientational processes in the yarns of high-molecular-mass cellulose acetate in vapors of nitromethane and its mixture with water

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Abstract

The phenomenon of spontaneous changes in the linear dimensions (elongation-contraction) is described for commercial and laboratory samples of acetate yarns processed by wet spinning from high- molecular -mass cellulose diacetate in vapors of a mesophas ogenic solvent (which is able to form a lyotropic LC phase with the polymer), nitromethane, and its mixtures with water. The thermodeformational, elastic- plastic, physicomechanical, and surface characteristics of the yarns at different stages of their spontaneous deformation are analyzed. When samples are treated with probe vapors, orientational processes in the polymer matrix are activated, and this observation makes it possible to prepare yarns with improved physicomechanical characteristics and with low linear density. A new phenomenon (to our knowledge) of cyclic three- stage deformation of acetate monofilaments in nitromethane vapors is discovered. This evidence is interpreted from the standpoint of phase (amorphous glassy-liquid crystalline state) and conformational transitions as well as by the mechanism of interaction between polymers and solvent vapors and related development of the LC phase.

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Authors and Affiliations

  1. Chernyshevsky Saratov State University, ul. Astrahanskaya 83, Saratov, 410012, Russia

    A. B. Shipovskaya, A. Yu. Abramov, S. Yu. Shchegolev & V. P. Ryabukho

  2. Research Institute of Natural Sciences, Saratov State University, ul. Astrakhanskaya 83, Saratov, 410012, Russia

    G. N. Timofeeva

  3. Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, pr. Entuziastov 13, Saratov, 410049, Russia

    S. Yu. Shchegolev

Authors
  1. A. B. Shipovskaya
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  2. G. N. Timofeeva
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  3. A. Yu. Abramov
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  4. S. Yu. Shchegolev
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  5. V. P. Ryabukho
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Correspondence to A. B. Shipovskaya.

Additional information

This work was supported by the Russian Foundation for Basic Research, project nos. 03-03-33049a and 06-08-00892a.

Original Russian Text © A.B. Shipovskaya, G.N. Timofeeva, A.Yu. Abramov, S.Yu. Shchegolev, V.P. Ryabukho, 2010, published in Vysokomolekulyarnye Soedineniya, Ser. A, 2010, Vol. 52, No. 2, pp. 208–216.

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Shipovskaya, A.B., Timofeeva, G.N., Abramov, A.Y. et al. Orientational processes in the yarns of high-molecular-mass cellulose acetate in vapors of nitromethane and its mixture with water. Polym. Sci. Ser. A 52, 126–133 (2010). https://doi.org/10.1134/S0965545X10020033

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  • DOI: https://doi.org/10.1134/S0965545X10020033

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