Abstract
Tributylvinylphosphonium bromide was found to be isomorphous with tributylvinylphosphonium iodide. Their solid solutions were characterized microscopically and by x-ray diffraction. X-ray-initiated polymerization of the pure iodide and copolymerization of six solid solutions of different compositions of the two monomers were investigated over the temperature range from 60 to -80 deg C. S-shaped polymerization rate curves were obtained. Generally the polymerization rates of intermediate compositions were found to be intermediate between the two pure monomers. However, some compositions rich in the bromide exhibited slower rates than either pure monomers. The apparent activation energies for polymerization increased with increased bromide/iodide ratios, and in a manner analogous to the effect of composition on the melting behavior of the solid solutions. (auth)
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