polyphosphazene

https://doi.org/10.1351/goldbook.15295
Polymer composed of macromolecules containing exclusively nitrilophosphanylylidene (formerly phosphazene) constitutional repeating units in the backbone:
polyphosphazene
where \(\ce{R^1}\) and \(\ce{R^2}\) are each a monovalent group, such as a halogen or an alkoxy group.
polyphosphazene
Examples:
polyphosphazene
polyphosphazene
Source:
PAC, 2009, 81, 1131. (Glossary of class names of polymers based on chemical structure and molecular architecture (IUPAC Recommendations 2009)) on page 1164 [Terms] [Paper]