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Ionic conductivity in polyphosphazene polymer electrolytes prepared by the living cationic polymerization

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Title: Ionic conductivity in polyphosphazene polymer electrolytes prepared by the living cationic polymerization
Authors: Paulsdorf, J.1, Burjanadze, M.1, Hagelschur, K.1, Wiemhöfer, H.-D. hdw@uni-muenster.de
Source: Solid State Ionics. Apr2004, Vol. 169 Issue 1-4, p25-33. 9p.
Subjects: Ionic mobility, Polyphosphazenes, Polymerization, Electrolytes
Abstract: Two polyphosphazene-based electrolytes were synthesized. The first was the polymer electrolyte poly[bis(methoxy-ethoxy-ethoxy-)phosphazene] (MEEP) with lithium triflate, the second was sodium salt of sulfonated poly[bis(phenoxyethoxy)phosphazene] (PhEP) as a polyelectrolyte. The “living” cationic polymerization of the monomer Cl3P&z.dbnd6;NSi(CH3)3 was used to obtain the polymer precursor poly(dichlorophosphazene). The final polymers were obtained from the precursor by nucleophilic substitution. The monomer was synthesized via a recently reported route. The emphasis lied on testing the accessability and properties of electrolyte materials obtained by the newer synthetic techniques. The chosen synthetic approach proved to be a suitable and straightforward access to functionalized polyphosphazenes and therefore to corresponding polymer-based electrolytes.The ionic conductivity was studied by impedance spectroscopy in the temperature range between 20 and 70 °C. The temperature dependence of the conductivity of MEEP/LiCF3SO3 is described by the Vogel–Tamman–Fulcher (VTF) equation. At 25 °C, its conductivity was 10-5 S cm-1.The conductivity of the sodium salt of sulfonated PhEP was especially sensitive to a changing water partial pressure and is useful as humidity-sensitive sensor. In the presence of a water-saturated atmosphere, sulfonated PhEP showed a conductivity of 4.7×10-2 at 25 °C. [Copyright &y& Elsevier]
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Abstract:Two polyphosphazene-based electrolytes were synthesized. The first was the polymer electrolyte poly[bis(methoxy-ethoxy-ethoxy-)phosphazene] (MEEP) with lithium triflate, the second was sodium salt of sulfonated poly[bis(phenoxyethoxy)phosphazene] (PhEP) as a polyelectrolyte. The “living” cationic polymerization of the monomer Cl3P&z.dbnd6;NSi(CH3)3 was used to obtain the polymer precursor poly(dichlorophosphazene). The final polymers were obtained from the precursor by nucleophilic substitution. The monomer was synthesized via a recently reported route. The emphasis lied on testing the accessability and properties of electrolyte materials obtained by the newer synthetic techniques. The chosen synthetic approach proved to be a suitable and straightforward access to functionalized polyphosphazenes and therefore to corresponding polymer-based electrolytes.The ionic conductivity was studied by impedance spectroscopy in the temperature range between 20 and 70 °C. The temperature dependence of the conductivity of MEEP/LiCF3SO3 is described by the Vogel–Tamman–Fulcher (VTF) equation. At 25 °C, its conductivity was 10-5 S cm-1.The conductivity of the sodium salt of sulfonated PhEP was especially sensitive to a changing water partial pressure and is useful as humidity-sensitive sensor. In the presence of a water-saturated atmosphere, sulfonated PhEP showed a conductivity of 4.7×10-2 at 25 °C. [Copyright &y& Elsevier]
ISSN:01672738
DOI:10.1016/j.ssi.2004.01.012