Effect of Metal Salts on Ionic Conductivity of Waste Cooking Oil Based Polyurethane Solid Polymer Electrolyte

• Published in: Journal of Physics: Conference Series
• Main Author: Husin M.A.; Tahir S.M.
• Format: Conference paper
• Language: English
• Published: Institute of Physics Publishing 2018
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85054401214&doi=10.1088%2f1742-6596%2f1083%2f1%2f012052&partnerID=40&md5=eab87c2fbdf3321121da8e26b4064734

The constant quest for green material to replace petroleum leads to utilization of waste cooking oil (WCO) as sustainable raw material to prepare polyurethane solid polymer electrolyte (SPE). In this study, pre-treated WCO was converted into polyol via epoxidation and hydroxylation reaction which aimed to introduce hydroxyl group on double bonds of free fatty acids in WCO. Then, WCO-based polyol was combined with 4,4-diphenylmethane diisocyanate to produce polyurethane (PU) as polymer host and 30 wt% metal salt was added to obtain SPE. Three types of metal salts were chosen to be incorporated in the SPE; lithium chloride (LiCl), lithium perchlorate (LiClO3) and sodium chloride (NaCl). The SPE films were prepared using solvent casting method and characterized using Fourier transform infrared (FTIR) spectroscopy, electrochemical impedance spectroscopy (EIS), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). FTIR spectra showed the presence of urethane linkage to verify that polyurethane has been successfully synthesized. EIS revealed the highest ionic conductivity value achieved at 3.02 x 10-5 S/cm for SPE with 30 wt% LiCl. The results showed the significance of metal salts cation and anion size on performance of SPE. © Published under licence by IOP Publishing Ltd.