Polyphosphazenes

Properties and Applications

Polyphosphazenes are inorganic polymers with a phosphorus-nitrogen main chain, [N=PR₂]_n. This class of polymers is produced by a rather unusual synthesis method that allows the types of side groups, R, to be varied over a broad range. One of the most common methods is ring-opening polymerization of (organic substituted) phosphazene cyclic trimers, followed by macromolecular substitution:

Polyphosphazenes are the largest family of inorganic polymers that possess many valued properties such as high thermal, mechanical and chemical stability which makes them attractive materials for numerous biomedical, elastomeric, and electrochemical applications. For example, they are or can be used as polymer electrolyte membranes for fuel cells and electrolytes for rechargeable lithium ion batteries or as high-performance seals, gaskets, O-rings and fuel lines with outstanding hydrocarbon-resistance. They also find uses in the medical device, pharmaceutical and biotechnology industry, for example, as biodegradable release and encapsulation materials in drug delivery systems; biological separation membranes for air enrichment, electrodialysis, water and gas purification; and as medical components such as prosthetics, denture liners, and implants.

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