Synthesis and structure of electrolytic complexes based on α-hydro-ω-oligo(oxyethylene)hydroxy-poly [oligo(oxyethylene)oxydimethylsililene] and δ-MgCl2

An alternated copolymer with the formula alpha-hydro-omega-oligo(oxyethylene)hydroxy-poly[oligo(oxyethylene)oxydimethylsililene] and a molecular weight of 9860 was synthesized. Doping of this polymer with the anhydrous salt delta-MgCl2 resulted in a new magnesium electrolytic complex poly[PEG400-alt-DEOS]/(MgCl2)(0.26). The structural hypothesis for the polymer was proposed on the basis of elemental analyses and molecular weight. Detailed H-1-, C-13, and Si-29-NMR spectral investigations fully confirmed the structure of poly[PEG400-alt-DEOS]. Mid-infrared region (MIR) FT-IR studies of the polymer showed that it presents (1) a sufficient number of terminal hydroxyl groups to confer a substantial degree of dissolution and salt-dissociation in the polymer complex; and (2) polyethereal fragments in a conformational geometry close to TGT (T = trans, G = gauche). The conductivity against temperature plot for this very amorphous magnesium polymer electrolyte demonstrated that the material conducts ionically by means of two types of charge migration mechanisms. (C) 2002 Elsevier Science B.V. All rights reserved.