Application of Raman and laser light scattering to the melt polymerization of hexachlorocyclotriphosphazene. 1

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The application of a novel laser light scattering apparatus is described for on-line monitoring of the high-temperature, melt polymerization of hexachlorocyclotriphosphazene (HCTP) and the in situ characterization of the poly(dichlorophosphazene) (PDP) product. A combination of Raman spectroscopy, angular measurement of absolute light scattering intensities, and Rayleigh line width (dynamic) light scattering measurements are employed. More conventional techniques are inappropriate due to the polymer’s hydrolytic instability, the high temperature required for polymerization, and the nature and apparent complexity of the reaction. Concentrations of the reaction components and characteristics of the polymer, such as weight-average molecular weight (Mw) and z-average radius of gyration (Rg) in the dilute solution regime and the cooperative diffusion coefficient (Dc) and osmotic compressibility [( / ) - ] in semidilute solutions, are monitored with polymerizationtime. Experimental results are found to be in excellent agreement with those obtained in directly by the batch wise polymerization of the same material.


© 1986 American Chemical Society