Solid-state Semi Interpenetrating polymer network and their composite with rutile TiO2 nanofiber electrolyte-correlation between morphology and conducting properties

S. Ghosh
Indian Institute of Chemical Technology, IN

Keywords: nanomaterials, polymer network

Summary:

A series of lithium electrolyte materials based on hybrid of semi Inter penetrating Polymer Network of [poly(ethylene glycol)-polyurethane-polymethylmethacrylate]/ [poly(ethylene glycol)-polyurethane-polyacrylonitrile] and TiO2 nanofibers is synthesized. TiO2 nano fibers are made by simple solvothermal procedure. Rutile phase of TiO2 and fibrous morphology is confirmed by X-ray diffraction pattern and Scanning Electron Microscopy image respectively. Semi Inter penetrating Polymer Network of polyethylene glycol - polyurethane/ polymethylmethacrylate with LiClO4,LiI and their nanocomposites with different weight percent of TiO2 nano fibers have been synthesized. The formation of Inter penetrating Polymer Network and their amorphous nature are confirmed by Fourier transform infrared spectra, X-ray diffraction pattern and Differential scanning calorimetry results. Thermo gravimetric analysis shows enhanced thermal stability of the composite compared to the semi Inter penetrating Polymer Network system. The electrical characterizations of the nanocomposites are done by current-voltage (I-V) measurements and impedance spectroscopy. These results confirm that incorporation of TiO2 nanofibers by 18 percent enhances the conductivity of the Inter penetrating Polymer Network system by ten times. The nanoscale structure of the inorganic material is found to be responsible for the bulk properties of the system, especially those that differ from the properties of similar, pure salt-in-polymer electrolytes.