Studies of ion mobility in polyelectrolytes based on aluminosilicate-polymer composites and polysiloxanes

Nanocomposites of cryptand[2.2.2] (4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo(8.8.8)hexacosane) are layered materials with a d-layer spacing of 17.9 Å. Nanocomposites of poly(bis(methoxyethoxyethoxy)-phosphazene) (MEEP) are also layered materials, and the d-layer spacing varied from 19 to 21 Å depending on polymer loading. 23Na MAS NMR spectroscopy of the MEEP- and cryptand-nanocomposites suggested that the interlayer Na + is more solvated in the nanocomposites than in the unintercalated Na-montmorillonite. The ion mobility of Na+ in the nano composites is up to three orders of magnitude greater than in the pristine Na montmorillonite, presumably owing to the increased solvation of the interlayer Na+ by the intercalated species. The temperature dependence of conductivity suggests that ion transport is coupled to polymer segmental motion in the MEEP-montmorillonite nanocomposites. Ion transport in the MEEP-montmorillonite materials is highly anisotropic, and the conductivity parallel to the layers is about 100 greater than conductivity perpendicular to the layers.; A new polysiloxane with two pendant oligoether side-chains per Si-O unit was synthesized. Lithium triflate complexes of this polysiloxane displayed conductivities at 25°C approaching 1.3 × 10-4 S/cm. Reaction of allyltributyltin with (4-iodo-octafluoro-ethoxyethyl)sulfonic acid, phenyl ester yielded (4-(prop-1-ene)-octafluoro-ethoxyethyl)sulfonic acid, phenyl ester. This was hydrosilylated onto poly(methylsiloxane) along with 3-(methoxytriethoxy)-prop-1-ene. Incorporation of a perfluorosulfonate onto a polysiloxane with solvating oligoether side-chains is a promising route to highly conductive polyelectrolytes.