| dc.description.abstract | A sol-gel synthetic route for preparing poly(oxyalkylene) block copolymers has been developed by using 2,4,6-trichloro-1,3,5-triazine (cyanuric chloride, cc) as the coupling core. The coupling reaction involves the selective substitutions of oligo(oxyalkylene)-amines onto the first two chlorides of the triazine ring in a stepwise manner at 0 and 25 oC, and then (3-aminopropyl)trimethoxysilane (APTMS) cross-linking to the third chloride site at 130 oC. Afterwards, (3-glycidyloxypropyl)
-trimethoxysilane (GLYMO) react with the NH2 end groups of
oligo(oxyalkylene)amines (Jeffamine-ED serious) and co-condensation with APTMS to form an organic-inorganic hybrid electrolyte system.
The effects of several variables on conductivity were investigated, such as length of PEO chain, percentage of EO/PO segments, extent of cross-linking, and salt concentration (LiClO4). A full characterization was made by Solution NMR, X-ray Diffraction Spectrometer (XRD), Thermo Gravimetric Analyzer (TGA), differential scanning calorimetry (DSC), ionic conductivity, IR spectroscopy, and multinuclear solid-state NMR spectroscopy. The optimal lithium ionic conductivity for the hyperbranched copolymer electrolytes thus obtained reaches 6.80 x 10-5 S/cm at 30 °C with the composition of cc: ED2000: GLYMO = 1:3:3. | en_US |