Non-symmetrical fluorinated side-groups substituted on a phosphorus-nitrogen polymer backbone yield elastomeric materials with properties that cannot be achieved with conventional carbon monomer polymers. Properties, including low glass-transition temperatures, high melt-transition temperatures, chemical resistance, fuels and hydrocarbon resistance, low compression set and high modulus, are typical of these elastomers. A fluorinated polyphosphazene (ASTM designation 'FZ') product was commercialized for aerospace use within the U.S. Department of Defence. The material was successfully used in elastomer applications requiring O-rings, T-rings, rotor seals and other military and armoured vehicle applications. At the end of the cold war, the sole supplier withdrew FZ from the market citing high costs. Fundamental research continued with gram quantities being produced on a laboratory scale. However, commercial development was impeded due to the unavailability of commercial quantities of phosphazenes and phosphazene starting materials. Materials Science Technology, Inc. (MST) has developed a process and constructed a plant that is currently producing 15000 kg/yr of FZ gum rubber under the trademark PNF.
Phosphazene elastomer use in defence and aerospace
2010
8 Seiten, 5 Bilder, 3 Tabellen
Conference paper
English
Phosphazene elastomer use in defence and aerospace
British Library Conference Proceedings | 2010
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