Letter | Published:

Polymerization of phosphazene crystal by plasma-exposure

Nature volume 286, pages 693694 (14 August 1980) | Download Citation



Attempts to polymerize hexachlorocyclotriphosphazene (PNCl2)3 by high-energy irradiation methods in the solid state have failed to give a significant amount of the polymer. We report here that (PNCl2)3 crystals can be polymerized quite easily when exposed to a low-pressure radio-frequency plasma. The polymerization takes place almost simultaneously with the plasma-exposure. The monomer conversion increases with the plasma power as well as plasma-duration. The product is a white, rubber-like material having a similar appearance to the elastomer obtained by thermal polymerization. The IR spectrum shows the same backbone structure as that obtained by thermal polymerization. It has also been found that post-polymerization takes place at elevated temperatures following a brief exposure (1–5 min) of plasma onto phosphazene crystals.

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  1. Department of Chemistry, College of Liberal Arts and Science, Ibaraki University, Mito 310, Japan

    • Yoshihito Osada
    •  & Masafumi Hashidzume
  2. Department of Polymer Chemistry, Waseda University, Tokyo 160, Japan

    • Eishun Tsuchida
  3. Department of Chemical Engineering, University of California, Berkeley, California 94720

    • Alexis T. Bell


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