Elastomeric Polyphosphazenes with Phenoxy-Cyclotriphosphazene Side Groups

Tomasz Modzelewski, Emily Wilts, Harry R. Allcock

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


New polymers with a phosphazene backbone and both 2,2,2-trifluoroethoxy- and phenoxy-functionalized cyclotriphosphazene substituents exist in three phases depending on the side group ratios. At low concentrations of the bulky substituents (up to ∼7 mol %), the polymers are semicrystalline thermoplastics, with properties that are minor variations of poly[bis(2,2,2-trifluoroethoxy)phosphazene]. However, after the incorporation of between ∼7 mol % and ∼20 mol % of the bulky cyclic trimeric side groups, the polymers lose their semicrystalline properties and become amorphous elastomers. At still higher trimer loadings (>20 mol %) the materials develop gum-like behavior. The elastomeric phase appears to be generated by interdigitation or agglomeration of the bulky aryloxy-cyclotriphosphazene side groups, which act as quasi-physical cross-links between the polymer chains. The presence of these interactions allows the materials to experience high strain values before rupture (up to 1000%), and elastic recovery of more than 85% of the original dimensions when stressed up to 60% of the break elongation over four cycles. In addition, the chemical and physical nature of the substituents on the cyclic trimeric side groups alters the physical characteristics of the polymer in a way that provides a facile method to tune the properties.

Original languageEnglish (US)
Pages (from-to)7543-7549
Number of pages7
Issue number20
StatePublished - Oct 27 2015

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry


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