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Synthesis of ultra-high-molecular-weight polyacrylonitrile by anionic polymerization

  • Polymerization
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Abstract

The anionic polymerization of acrylonitrile in DMF initiated by lithium 1,2-bis(diethylamino)-2-oxoethanolate in the range −60 to 0°C has been studied. The initiator efficiency at low temperatures (−60 to −40°C) is 2–6%; it remains nearly invariable with conversion owing to the associated state of the initiator. The low concentration of growing active centers is constant throughout the process; as a result, polymers with M > 3 × 105 are produced. The polymers are characterized by a narrow molecular-mass distribution, M w/M n = 1.3–1.6, and contain insignificant amounts of low-molecular-mass fractions. It has been shown that controlled polymerization processes can be carried outat moderately low temperatures (−30 to 0°C), and experimental conditions for freezing of polymerization and its recommencement have been ascertained. Optimum conditions for the synthesis of a high-molecular-mass polyacrylonitrile with M > 3 × 105 have been established, and the method for preparing polymers with M = (6.50–8.5) × 105 on an enlarged scale using high concentrations of the monomer has been developed.

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Authors and Affiliations

  1. Institute of Macromolecular Compounds, Russian Academy of Sciences, Bol’shoi pr. 31, St. Petersburg, 199004, Russia

    A. V. Novoselova, V. V. Shamanin & L. V. Vinogradova

Authors
  1. A. V. Novoselova
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  2. V. V. Shamanin
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  3. L. V. Vinogradova
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Correspondence to L. V. Vinogradova.

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Original Russian Text © A.V. Novoselova, V.V. Shamanin, L.V. Vinogradova, 2009, published in Vysokomolekulyarnye Soedineniya, Ser. B, 2009, Vol. 51, No. 7, pp. 1189–1195.

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Novoselova, A.V., Shamanin, V.V. & Vinogradova, L.V. Synthesis of ultra-high-molecular-weight polyacrylonitrile by anionic polymerization. Polym. Sci. Ser. B 51, 205–211 (2009). https://doi.org/10.1134/S156009040907001X

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  • DOI: https://doi.org/10.1134/S156009040907001X

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