Controlled refractive index polymers: Polyphosphazenes with chlorinated- and fluorinated-, aryloxy- and alkoxy- side-groups

Harry R. Allcock, Jared D. Bender, Youngkyu Chang, Marty McKenzie, Matilda M. Fone

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Abstract

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 (nTE - nTM) 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 °C. These properties, combined with the tailorability of the polyphosphazene system make chlorinatedand fluorinated-, alkoxy- and aryloxy-substituted polyphosphazenes possible candidates for optical waveguide and optical switching applications.

Original languageEnglish (US)
Pages (from-to)473-477
Number of pages5
JournalChemistry of Materials
Volume15
Issue number2
DOIs
StatePublished - Jan 1 2003

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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