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W.Sułkowski, V. V. Kireev, Z. K. Zinovic, A. G. Davtjan


Synthesis and characterization of polydibenzyloxyphosphazene


Polimery 1989, No 5, 204



DOI: dx.doi.org/10.14314/polimery.1989.204


Summary

In the reaction of chlorine atoms substitution in polydichlorophosphazene (PFC) by sodium benzylate, polydibenzyloxyphosphazene (PBF) has been obtained. The effect of the reaction conditions (type of solvent, temperature) on the yield, reduced viscosity, and chlorine content in PBF has been characterized. It has been found that a complete substitution of chlorine atoms in PCF can be reached, when PBF synthesis is carried out first in a dioxane-benzene mixture, and then in pure dioxane. By the light-scattering and viscometrics measurements on solution of PBF fractions it has been demonstrated that PBF has a high molecular mass and wide molecular mass distribution. The values of square radius of gyration R2 and second virial coefficient are a little lower than those for polydiphenoxyphosphazene. The Mark-Houwink equation describing the dependence of limiting viscosity number of PBF on molecular mass in the range of molecular mass form 3.6·104 to 106 chloroform at 25°C has the form of [η] = 6.79·105·M0,68.


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