Journal
CHEMISTRY OF MATERIALS
Volume 15, Issue 2, Pages 473-477Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm020912v
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A series of novel halogenated alkoxy and aryloxy polyphosphazenes have been synthesized via macromolecular substitution reactions carried out on poly(dichlorophosphazene). These polymers showed good film-forming properties and tunability of refractive index. Moreover, several examples combined low glass transition temperatures with high refractive index changes as a function of temperature - a prerequisite for optical switching applications. The refractive indices could be controlled over the range of 1.3889-1.5610 by alterations to the side-groups or side-group ratios. The birefringence (n(TE) - n(TM)) of these polyphosphazenes was shown to be highly dependent on the amount of aryloxy side-group attached to the polyphosphazene backbone. They showed evidence of thermal stability up to 400 degreesC. These properties, combined with the tailorability of the polyphosphazene system make chlorinated and fluorinated-, alkoxy- and aryloxy-substituted polyphosphazenes possible candidates for optical waveguide and optical switching applications.
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