Polyphosphazenes with Cyclotetraphosphazene Side Groups: Synthesis and Elastomeric Properties

Zhongjing Li, Chen Chen, Zhicheng Tian, Tomasz Modzelewski, Harry R. Allcock

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8 Scopus citations


Abstract: Trifluoroethoxy cyclotetraphosphazene units, [N4P4(OPhO–)(OCH2CF3)7], have been linked to the main chain of fluoroalkoxy polyphosphazenes through –OPhO– spacer groups. The thermal and mechanical properties of these inorganic backbone polymers have been investigated to examine the influence of the bulky cosubstituent groups. Five polymers with OCH2CF3 as the major substituents (90–99 %) and [N4P4(OPhO–)(OCH2CF3)7] units as the minor side groups (1–10 %) have been synthesized and characterized. The glass transition temperatures and microcrystallinity are influenced dramatically by the incorporation of the cyclotetraphosphazene side groups. Specifically, the polymers range from leathery to elastomeric materials as the percentage of the cyclotetraphosphazene side groups increases from 1 to 10 %. Tensile stress vs strain tests were carried out for the polymers with 4.0 and 8.3 % cyclotetraphosphazene side groups respectively. Break elongations of 838 and 1485 % for polymers with 4 and 8.3 mol% of the bulky side groups respectively were recorded, with both polymers showing reversible elongation with some deformation. The special elastomeric properties are attributed partially to non-covalent cross-links from interdigitation of the bulky cyclotatraphosphazene units. Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish (US)
Pages (from-to)667-674
Number of pages8
JournalJournal of Inorganic and Organometallic Polymers and Materials
Issue number3
StatePublished - May 1 2016

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Materials Chemistry


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