Conductance study of poly(ethylene oxide)- and poly(propylene oxide)-based polyelectrolytes |
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Authors: | Mohammad Saleem Khan Abdul Shakoor and Jan Nisar |
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Institution: | (1) National Center of Excellence in Physical Chemistry, University of Peshawar, Peshawar, 25120, Pakistan |
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Abstract: | The ionic conductivity of poly(ethylene oxide) and poly(propylene oxide) in pure solution form, individually complexed with
salts of Na+ and Li+, with and without plasticizer (propylene carbonate) and in blended form with individual salt with and without plasticizer,
was studied. The conductance measurements were made at various concentrations of salt polymer complexes and at different temperatures.
The effects of temperature and plasticizer concentration were measured from Arrhenius conductance plots. It is shown that
the addition of salts in pure PEO increases conductance many times. The plasticizer has also same effect. The blending of
PEO with PPO gives enhanced conductivity as compared to pure PEO. The activation energies were determined for all the systems
which gave higher values for pure PEO and the value decreases with the addition of Li and Na salts and further decreases with
the addition of plasticizer. The blending has also lowered the activation energy values which mean that incorporation of PPO
in PEO has decreased crystallinity and the amorphous region has increased the local mobility of polymer chains resulting in
lower activation energies. |
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