Synthesis of star network solid polymer electrolytes and study on its ionic conductivity

Star network polymer was systhesized by polyethylene glycol (PEG,M_n=400,600),pentaerythritol and CH_2Cl_2 with the existence of alkaline.FTIR and ~1H-NMR measurement demonstrated that the polymer re- peating unit was C[CH_2-OCH_2O-(CH_2CH_2O)_n-CH_2O~-]_4.the polymer with pentaerythritol was star network, with improving the film processability,mechanical properties and thermal stability properties.AC impedance was used to investigate ionic conductive property of solid polymer electrolytes,the results demonstrated that the plot of conductivity vs.salt concentration showed two peaks at 25℃,whenω(LiClO_4/polymer)=8%,the high- est ionic conductivity attained 1.03×10~(-4)S/cm;the ionic conductivity increased with increasing temperature, and the curve didn't coincided with Arrhenius formula.