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Evaluation of nonuniformity of polymeric membrane materials by positron annihilation technique

  • Nuclear Chemistry
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Abstract

Positron annihilation lifetime distribution was experimentally studied in some polymers, including polymeric membrane materials, in an air and a nitrogen atmosphere. Basic attention was paid to the long-lived distribution component, i.e., to annihilation of orthopositronium (the positron-electron bound system). It was found that ambient oxygen affects the annihilation characteristics of positronium. Newly developed ideas on the mechanisms of formation, localization, and annihilation of positronium in the polymers lead to the conclusion that the distribution of free volumes of different size in the polymeric matrix is not uniform. The number concentration and size of free-volume holes and the size of microirregularities containing these holes were determined

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Authors and Affiliations

  1. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 117334, Moscow, Russia

    V. P. Shantarovich & I. B. Kevdina

  2. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninskiipr. 29, 117912, Moscow, Russia

    Yu. P. Yampol’skii

Authors
  1. V. P. Shantarovich
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  2. I. B. Kevdina
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  3. Yu. P. Yampol’skii
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Shantarovich, V.P., Kevdina, I.B. & Yampol’skii, Y.P. Evaluation of nonuniformity of polymeric membrane materials by positron annihilation technique. High Energy Chem 34, 265–272 (2000). https://doi.org/10.1007/BF02770896

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  • DOI: https://doi.org/10.1007/BF02770896

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