A polyphosphazene composition stabilized against thermal aging and use therof.

摘要

When polyphosphazenes are exposed to elevated temperatures, their physical properties often deteriorate. The addition of a stabilizing compound represented by the structure:
<CHEM>
wherein W is -CRR min -CRR min or
<CHEM>
and wherein R and R min are selected from the group consisting of hydrogen, alkyl, cycloalkyl, acyl or a mixture thereof, and M is zinc or magnesium; to polyphosphazene rubbers result in improved retention of the physical properties of such polyphosphazenes. Further, the use of additives of this type does not adversely affect the ability of peroxy compounds to cure the polyphosphazenes to form vulcanizates.
<??>Especially useful compounds represented by the above structural formula are zinc or magnesium 1,2-bis (2-oxybenzylideneamino) ethylene.