Title of article :
Ionic conductivity of polymer electrolyte membranes based on polyphosphazene with oligo(propylene oxide) side chains
Author/Authors :
Kaskhedikar، نويسنده , , N. and Paulsdorf، نويسنده , , J. and Burjanadze، نويسنده , , M. and Karatas، نويسنده , , Y. and Wilmer، نويسنده , , D. and Roling، نويسنده , , B. and Wiemhِfer، نويسنده , , H.-D.، نويسنده ,
Issue Information :
هفته نامه با شماره پیاپی سال 2006
Pages :
5
From page :
703
To page :
707
Abstract :
A polyphosphazene [NP(NHR)2]n with oligo[propylene oxide] side chains − R = –[CH(CH3)–CH2O]m–CH3 (m = 6 – 10) was synthesized by living cationic polymerisation and polymer-analogue substitution of chlorine from the intermediate precursor [NPCl2]n using the corresponding primary amine RNH2. The polymer had an average molecular weight of 3.3 × 105 D. Polymer electrolytes with different concentrations of dissolved lithium triflate (LiCF3SO3) were prepared. Mechanically stable polymer electrolyte membranes were formed using UV radiation induced crosslinking of the polymer salt mixture in the presence of benzophenone as photoinitiator. The glass transition temperature of the parent polymer was found to be − 75 °C before cross linking. It increases after crosslinking and with increasing amounts of salt to a maximum of − 55 °C for 20 wt.% LiCF3SO3. The ionic conductivity was determined by impedance spectroscopy in the temperature range 0–80 °C. The highest conductivity was found for a salt concentration of 20 wt.% LiCF3SO3: 6.5 × 10− 6 S·cm− 1 at 20 °C and 2.8 × 10− 4 S cm− 1 at 80 °C. The temperature dependence of the conductivities was well described by the MIGRATION concept.
Keywords :
Polymer electrolytes , Polyphosphazene , ionic conductivity
Journal title :
Solid State Ionics
Serial Year :
2006
Journal title :
Solid State Ionics
Record number :
1718744
Link To Document :
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