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Ring-Ring and Ring-Chain Equilibration of Phosphazene Polymerization.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF CHEMISTRY
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Hexamethylcyclotriphosphazene, NPCH323 III, and octamethylcyclotetraphosphazene NPCH324 IV participate in a ring-ring equilbration at temperatures between 200 and 350, but they do not polymerize. A deltaH value of 10.2 kcal and a deltaS value of 14.3 eu were determined for the tetramertrimer interconversion. The equilibration is inhibited by base. Acids accelerate equilibration and also yield linear low molecular weight compounds. The results are compared with the ring-high polymer interconversions in the halogenophosphazene series.
APPROVED FOR PUBLIC RELEASE