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Characterization of a stoichiometric range of sodium salt complexes of amorphous poly[(oxymethylene)oligo(oxyethylene)] by differential scanning calorimetry and sodium-23 NMR

Sodium salt complexes of poly[(oxymethylene)oligo(oxyethylene)], [OCH 2 (OCH 2 CH 2 ) m ] n (m=8-10), are characterized by DSC between 190 and 295 K and 23 Na NMR spectroscopy between 208 and 358 K using an inversion-recovery pulse sequence. The complexes studied (polymer x NaAn, An=ClO 4 and I, x=8-150) crystallize near 280 K only for x>25; higher salt concentrations result in complexes which remain amorphous throughout the temperature range studied. T g s are determined for each complex, and the conductivity-temperature plots fit to the VTF equation using the relation T 0 =T g -27 K