Investigation of electrolyte properties of bio-based polyurethanes

In this study, epoxised soybean oil was made to the epoxy ring and bio-based polyols were synthesized and polyurethane electrolytes are synthesized using the obtained polyols. To increase ionic conductivity of bio-based polyurethane electrolytes, lithium perchlorate LiClO4 additive bio-based polyurethane electrolytes have been synthesized and reported for the first time. It was used in polyurethane synthesis by making the ring opening with thioglycolic acid (TGA) and glycolic acid (GA). Bio-derived polyurethanes were obtained by reacting with 4,4'-methylenebis (phenyl isocyanate) (MDI) with PTGA, PGA and in addition, different bio-based polyurethane was synthesized by the addition of lithium perchlorate LiClO4 salt at different concentration rates in the same reaction. The structures of these compounds were determined with FT-IR, Xrd, DSC and conductivity measurements were made in the range of 4Hz-8MHz by using the parallel plate capacitor method. Same polyol/MDI ratio %0, %5, %10 ,%20, %30 lithium perchlorate LiClO4 salt containing polyurethane has been observed to increase conductivity as the rate of lithium perchlorate increased. PGA based polyurethane electrolyte conductivity with the highest lithium perchlorate concentration was measured as 4,8x10-7 S/cm, PTGA 1,45x10-6 S/cm. It was observed that the conductivity of TGA based polyurethane was higher than that of GA-based polyol.