Polymer Characterization Sample Clauses

Polymer Characterization. Polymers will be analyzed and characterized by basic physicochemical methods: NMR and IR spectroscopy will be performed, and ionic conductivity investigated through Electrochemical Impedance Spectroscopy (EIS). Also, thermal (TGA, DSC) thermomechanic (Dynamic mechanical analysis (DMA)) and rheological properties (viscosity) will be assessed. H NMR and IR Spectroscopy ORMOCER® At FhG ISC the final ORMOCER® resin (not-cured polymer material) is characterized by 1H, 13C and 29Si NMR. NMR spectra were obtained with a Bruker Avance spectrometer (frequencies: 400 MHz (1H NMR), 100 MHz (13C NMR), 79 MHz (29Si NMR)). Deuterated solvent used was CDCl3. Starting from alkoxylated silane precursors the polymer is formed via sol-gel synthesis (hydrolysis / condensation). Hydrolysis reaction was monitored by 1H NMR spectroscopy. Condensation and content of water can be monitored either by the combination of 1H and 29Si NMR or by IR spectroscopy (Nicolet iS5 spectrometer, quipped with a Specac Quest single reflection ATR accessory (diamond crystal), medium infrared region (MIR) 4000- 400 cm-1). Fluorocarbon-based polymer IR spectrophotometry is performed at DAIKIN with IR-Tracer 100 (Shimadzu) equipped with a single reflection ATR accessory (diamond crystal, 10.000 - 40 cm-1). NMR spectra are obtained with a Bruker Fourier 80 spectrometer (80 MHz homonuclear 1H or heteronuclear 1H/13C FT-NMR). Electrochemical Impedance Spectroscopy (EIS) (Ionic conductivity) ORMOCER® At FhG ISC, the ionic conductivity of the polymer was determined with the help of impedance spectroscopy. Impedance measurements were performed with EL-ECC® cells and with a Biologic VMP300 potentiostat in a frequency range of 7 MHz to 100 mHz and a AC amplitude of 10 mV. A symmetric cell with stainless steel as working and counter electrode was assembled and placed in a climate chamber (Vötsch). Impedance measurements were performed at different temperatures starting from 25 °C. Heating and cooling curves have been set as follows: 45 °C, 60 °C, 80 °C, 60 °C, 45 °C, 25 °C, 15 °C, 0 °C, -20 °C, 0 °C, 15 °C, 25 °C. In between temperature changes the cells have been tempered for 4 hours to ensure a constant temperature within the cell. The bulk resistances of the electrolytes were calculated by reproducing the impedance spectra through equivalent circuit models. Once obtained the bulk resistances, the conductivities were obtained by correcting the inverse of the resistances for the geometrical constant of the c...
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