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.
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