Phosphonitrilic Compounds: Part I. The Mechanism of Phosphonitrilic Chloride Polymerization Capacitance, Conductance, and Electron-Spin Resonance Studies

Abstract

Capacitance and conductance measurements were carried out with molten (NPC12)3 and [NP(OCeHS)2]3 and dipole moments were determined in benzene solution. Attempts to detect free radicals in molten samples of the same compounds were unsuccessful. Evidence was obtained that homolytic or heterolytic phosphorus-nitrogen ring cleavage is not involved in the primary initiation process. The results favor, instead, a polymerization mechanism for (NPCl2)8 in which phosphorus-chlorine ionization is a preliminary step.

Application of cyclophosphazene derivatives as flame retardants for ABS

“…PNCP (phenol derivative of cyclotriphosphazene) [20], CTCP (catechol derivative of cyclotriphosphazene) [21], and HNCP (2,3-dihydroxynaphthalene derivative of cyclotriphosphazene) [22] were synthesized by reacting HCCP with phenol, catechol and 2,3-dihydroxynaphthalene, respectively, using already reported methods. Novolac was synthesized from phenol, 37% formaldehyde, oxalic acid dehydrate using reported methods [23].…”

Solution polymerization of selected polyphosphazenes

“…Claims have been made for both cationic 12, '3) and free radical 14) polymerization, but the answer may vary depending on the catalyst and/or the temperature employed. Claims have been made for both cationic 12, '3) and free radical 14) polymerization, but the answer may vary depending on the catalyst and/or the temperature employed.…”

Controlled synthesis of organic-inorganic polymers that possess a backbone of phosphorus and nitrogen atoms

“…)polymerize thermally to yield macro- These observations suggest that the presence of P-Cl bonds in the system is a prerequisite for chain propagation, perhaps because of the capacity of P-Cl bonds to ionize thermally (Ref. 44) or the facility with which traces of water can induce hydrolysis to P-OH units (Refs. 41 &45).…”