POLY(SODIUM 2-[OMEGA-METHACRYLOYL OLIGO(OXYETHYLENE)] ETHYLSULFONATE)AS A NEW-TYPE OF POLYMER ELECTROLYTE WITH NA-IONIC CONDUCTIVITY( SINGLE)

Sodium 2-[omega-methacryloyl oligo(oxyethylene)] ethylsulfonate has be en synthesized and polymerized to prepare a polymeric solid electrolyt e with Na+ single-ionic conductivity. The length of oligo(oxyethylene) side chain determines the glass transition temperature and salt conce ntration of the homopolymers, and consequently influences the conducti vity. The highest conductivity of 3.5 x 10(-6) S cm-1 at 25-degrees-C is obtained when the number of CH2CH2O repeat units in the side chain is equal to 14. The temperature dependence of the ionic conductivity s hows a curved Arrhenius plot, suggesting that ionic conduction is clos ely associated with segmental motion of the polymer host. The Williams -Landel-Ferry (WLF) empirical equation, which is based on the free-vol ume theory, is found to be valid for describing the conductivity data, and the obtained WLF parameters are comparable with the universal val ues.