The polymerization of [P(O2C12H8)(N3)] and the formation of soluble and insoluble poly(2,2′-dioxy-1,1′-biphenylphosphazene) |
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Authors: | Gabino A Carriedo Alejandro Presa Soto Maria Luisa Valenzuela |
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Institution: | aDepartamento de Química Orgánica e Inorgánica, Facultad de Química, Universidad de Oviedo, C/Julián Clavería S/N, Oviedo 33071, Spain |
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Abstract: | The phosphorus azide P(O2C12H8)(N3)] (O2C12H8) = 2,2′-dioxy-1,1′-biphenyl] undergoes a solid state polymerization at 30 °C giving a separable mixture of the polyphosphazene {NP(O2C12H8)]}n with a Mw in the range of 104, together with a fraction of small and large cyclic spirophosphazene oligomers {NP(O2C12H8)]}n, and an insoluble polymeric material with a very high char forming tendency, consisting very likely on a network of large interlooped cyclic oligomers and polymers of overall composition NP(O2C12H8)]n. The reaction proceeds with smooth though irregular release of nitrogen at first but tending to abrupt accelerations ending in an explosion. The later outcome is more likely in scales of 10–50 g, and results in a decrease in the yield of the soluble polymer and a large increase in the yield of the polymeric matrix. |
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Keywords: | Polyphosphazenes Biphenoxyphosphazenes Phosphorus azides Polymerization |
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