| 초록 |
Segmented polyether polyurethanes (SPEs) which consist of soft and hard segments possess a two-phase morphology due to segmental incompatibility. In other words, the unfavorable interactions between the hard and soft segments drive the system to form a microphase-separated structure which typically imparts elastomeric properties to the segmented polyether polyurethane. SPEs have good mechanical properties, good chemical stability and low glass-transition temperature owing to a two-phase morphology. When salts are added, SPEs with flexible polyol backbone including oxygen group have ionic conducting property. However SPEs didn't apply to industrial polymer electrolyte market due to poor electrochemical stability. So, we improved electrochemical stability by using the multivalent salts such as Mg2+, Cu2+ in SPEs, because multivalent salts have good electrochemical stability in solid polymer electrolytes. The aim of this work is to develop solid polymer electrolyte which has good electrochemical stability by using magnesium salt. This SPE is prepared from 4,4'-methylenebis(phenyl isocyanate), 1,4-butanediol, and polyethylene glycol. Electrochemical properties of SPEs were investigated by using AC impedance measurement and cyclic voltammetry(CV). Particularly, ether group selectivity of Mg2+ was estimated by using Fourier transform infrared spectroscopy(FT-IR) and differential scanning calorimetry (DSC).
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