Accession Number:

ADA021932

Title:

Ring-Ring and Ring-Chain Equilibration of Phosphazene Polymerization.

Descriptive Note:

Technical rept.,

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF CHEMISTRY

Personal Author(s):

• Allcock,Harry R.
• Patterson,Dennis B.

Report Date:

1976-02-01

Pagination or Media Count:

23.0

Abstract:

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.

Descriptors:

• *SYNTHESIS(CHEMISTRY)
• AROMATIC HYDROCARBONS
• ENTHALPY
• CHEMICAL ANALYSIS
• THERMAL DEGRADATION
• PYROLYSIS
• ENTROPY
• CHROMATOGRAPHY
• PHOSPHAZENE
• NITROGEN HETEROCYCLIC COMPOUNDS
• PHOSPHORUS HETEROCYCLIC COMPOUNDS

Subject Categories:

• Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE