Abstract
Benzenesulfonate (Bs) groups were introduced to the terminal of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) oligomers with molecular weight (MW) of 300–6000 to design an ion conductive amorphous matrix. The phase of these PEO-salt hybrids was mainly influenced by the MW of the polyethers. PEO oligomers having benzenesulfonate group(s) with MW less than 600 showed amorphous phase in the bulk in a wide temperature range (−120 ∼ + 150 °C). The ionic conductivity of these amorphous salts was considerably influenced by the glass transition temperature ( T g ). The T g of these PEO-salt hybrids was influenced by the fraction of salt group in the matrix. Among totally amorphous salts, the best ionic conductivity of 2.95 × 10 −5 S cm −1, at 50 °C was obtained in the PEO 550-BsCs. Though PEO 350-BsM was also an amorphous salt, lower ionic conductivity was observed because of higher T g than that of PEO 550-BsM. However, PEO 350-BsM was useful as electrolyte in PEO oligomers because of excellent compatibility with the PEO oligomers. The ionic conductivity of PEO 350-BsM in PEO 300 (MW of 300) was 40 times higher than that of PEO 350-BsM in the bulk. Since PEO 350-BsM was inherently ion conductive, the ionic conductivity for PEO 350-BsM PEO 300 was kept high regardless of the salt concentration.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call