Study on ionic conductive property of polyurethane/oligo-ether sulfate complex

A new oligo-ether sulfate (SPEG) and linear polyether urethane (PU) have been synthesized successfully, and a series of novel solid polymer electrolytes based on PU/oligo-ether sulfate complexes were prepared. Effects of temperature, salt concentration (O:Na+, the molar ratio of ether unit to sodium cation), content of SPEG and polydioxolane (PDXL) on morphological structure and ionic conductive property were investigated in detail. It was found that oligo-ether sulfate had great effect on morphological structure of samples. Results showed that ionic conductivity of this system could reach 10−5 S cm−1 at medium temperature (60°C) and temperature dependence of ionic conductivity was not an Arrhenius-type one. The ionic conductivity increased with increase of SPEG content over whole range of salt concentration studied and ionic conductivity of SPU-600 was higher than that of SPU-400 at the same O:Na+. In addition, plasticizer PDXL and its content significantly influenced the ionic conductive properties of the samples.