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Dynamic properties of polymers bases on vinylferrocene from Mössbauer spectroscopy

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Abstract

Mössbauer absorption experiments on polyvinylferrocene, on a copolymer of acrylonitrile and vinylferrocene and on the swollen copolymer reveal an anomalous decrease of the recoilfree fraction f′ between 80 K and 130 K accompanied by line broadening and subsequent motional narrowing. The data are interpreted in terms of an anharmonic, hindered motion of the ferrocene sidegroup. In polyvinylferrocene this activation can be described by an Arrhenius law with barriers corresponding to about 15 kJ/mole separating at least three conformational states characterized by different hyperfine interactions. The anomalous change of f′ arises from a phase incoherence during gamma-ray absorption due to hopping of the iron between different positions. The maximum distance between these iron sites is estimated to be about 0.44 Å. A further decrease of f′ near the glass transition (190 K) of the swollen copolymer indicates a widening of the outer dimension of the anharmonic conformational potential to about 0.95 Å.

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Author information

Author notes

  1. H. Alcala

    Present address: Universidad Autonoma Madrid, Spain

Authors and Affiliations

  1. Physik Department, Technische Universität München, D-8046, Garching, Fed. Rep. Germany

    F. J. Litterst & H. Alcala

  2. Zentralinstitut für Tieftemperaturforschung, Bayerische Akademie der Wissenschaften, D-8046, Garching, Fed. Rep. Germany

    A. Lerf

  3. Institut für Makromolekulare Chemie, Technische Universität München, D-8046, Garching, Fed. Rep. Germany

    O. Nuyken

Authors
  1. F. J. Litterst
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  2. A. Lerf
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  3. O. Nuyken
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  4. H. Alcala
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Work supported by Bundesministerium für Forschung und Technologie.

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Litterst, F.J., Lerf, A., Nuyken, O. et al. Dynamic properties of polymers bases on vinylferrocene from Mössbauer spectroscopy. Hyperfine Interact 12, 317–328 (1982). https://doi.org/10.1007/BF01026380

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  • DOI: https://doi.org/10.1007/BF01026380

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