Reactions between Hexachlorocyclotriphosphazene and Hexamethylcyclotrisiloxane: Polymerization, Ring Cleavage, and Cross-Linking

Harry R. Allcock, David J. Brennan, Robert W. Allen

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The reactions between (NPCl2)3and (OSiMe2)3at 250 °C have been investigated. Three main processes occur: siloxane ring-ring equilibration, homopolymerization of (NPCl2)3 to high polymeric (NPCl2)n, and siloxane skeletal cleavage by P-Cl bonds to yield cyclic phosphazenes bearing one or two w-chlorosiloxane side groups. The formation of phosphazene polymers cross-linked by P-O-P bonds also occurs at later stages of the reaction. α, ω-Dichlorosiloxanes are liberated in this latter process. Similar reactions are evident when (NPCl2)3reacts with (OSiMe2)4 or (Me3Si)2O. The interconnected reaction pathways that lead to these products are discussed.

Original languageEnglish (US)
Pages (from-to)139-144
Number of pages6
Issue number2
StatePublished - Jan 1 1985


All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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