Ring Expansion and Equilibration in Organophosphazenes, and the Relationship to Polymerization

Abstract

A series of cyclic trimeric phosphazenes that bear both halogen and organic side groups have been found to undergo ring expansion-equilibration reactions at elevated temperatures. Compounds non-gem N3P3F5CMe3, N3P3F5Ph, N3P3F4 (CMe3)2,N3P3F4Ph2, hexamers, and in some cases, heptamers, octamers, and nonamers when heated. The cyclic tetramers (NPC1Me)4 and (NPC1Et)4 also equilibrate to a range of cyclic species that range from trimer to hexamer. Several of these equilibrations also lead to the formation of high polymers. The results are discussed in terms of possible mechanisms for ring-ring equilibration and polymerization. Keywords: Synthesis; Mechanisms; Thermal stability.

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Document Details

Document Type
Technical Report
Publication Date
Feb 15, 1990
Accession Number
ADA218234

Entities

People

  • Gayann S. Mcdonnell
  • Harry R. Allcock
  • James L. Desorcie

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemical Engineering
  • Chemical Reactions
  • Chemistry
  • Chlorine
  • Engineering
  • Halogens
  • Inorganic Chemistry
  • Materials
  • Materials Laboratories
  • Materials Science
  • Military Research
  • Molecular Weight
  • Molecules
  • Pennsylvania
  • Small Molecules
  • United States
  • Universities

Fields of Study

  • Chemistry

Readers

  • Organic Chemistry
  • Polymer Science and Technology