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Phase processes and energetics of spontaneous change in the dimensions of acetate fibers in nitromethane vapors

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Abstract

The phenomenon of cyclic change (elongation and contraction) in the dimensions of acetate filaments and monofibers in the vapors of nitromethane as a specific solvent is quantitatively described. An algorithm for calculating the energy characteristics of the deformation, including the specific work, is developed. The longitudinal viscosity is estimated according to the deflection of a horizontally stretched sample. It is shown that the stereomeric structure of the polysaccharide is altered in the process of cyclic change in the filament dimensions, as is confirmed by reversal of the sign of specific optical rotation. The resultant data are interpreted in terms of phase (amorphous vitreous versus liquid-crystal states) and conformational transitions.

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Authors and Affiliations

  1. Chernyshevskii State University, ul. Astrakhanskaya 83, Saratov, 410012, Russia

    A. B. Shipovskaya & S. L. Shmakov

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

    G. N. Timofeeva

Authors
  1. A. B. Shipovskaya
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  2. S. L. Shmakov
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  3. G. N. Timofeeva
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Additional information

Original Russian Text © A.B. Shipovskaya, S.L. Shmakov, G.N. Timofeeva, 2006, published in Vysokomolekulyarnye Soedineniya, Ser. A, 2006, Vol. 48, No. 5, pp. 801–814.

This work was supported by the Russian Foundation for Basic Research, project no. 03-03-33049a.

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Shipovskaya, A.B., Shmakov, S.L. & Timofeeva, G.N. Phase processes and energetics of spontaneous change in the dimensions of acetate fibers in nitromethane vapors. Polym. Sci. Ser. A 48, 509–519 (2006). https://doi.org/10.1134/S0965545X06050087

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  • DOI: https://doi.org/10.1134/S0965545X06050087

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