Ionic Conductivity Studies of Epoxidized Poly (Methyl Methacrylate)-Grafted Natural Rubber Based Gel Polymer Electrolyte for Dye Sensitized Polymer Solar Cell

摘要

The epoxidized 30% PMMA grafted natural rubber (EMG30) was prepared using performic epoxidation method. 'HNMR studies confirm the appearance of epoxy group at 2.71 ppm in MG30 structure. The highest epoxidation content in EMG30 was used as a polymer host in gel polymer electrolyte (GPE) system. GPE film was prepared using 62.3 mol % EMG30, lithium trifluoromethanesulfonate (LiCF_3SO_3) and ethylene carbonate (EC). The conductivity of these polymer electrolytes was studied by AC impedance spectroscopy. The highest value was achieved up to 4.83 x10-~3 S cm-~1 at 50 wt. % of EC in EMG30-LiCF_3SO_3 system. The increase in conductivity is associated to the increase of the segmental chain flexibility of the plasticized film indeed increases of the amorphous domain and was confirmed by X-ray diffraction (XRD) and differential scanning calorimetry (DSC) studies. These results show that this GPE system is a suitable candidate for use as an electrolyte in dye-sensitized polymer solar cell.