Abstract
Abstract : Complexes between branched polyethyleneimine and Sodium trifluoromethane sulfonate were formed with a polymer repeat unit to salt ratio of 6:1, 12:1 and 20:1. All three complexes are amorphous in contrast to linear polyethyleneimine which forms partially crystalline complexes at ratios above 6;1 (lower salt concentrations). The 6:1 complex of branched polyethyleneimine has a higher glass transition temperature (12 C) and a lower conductivity than the corresponding complex of linear polyethyleneimine. The glass transition temperature of the polymer-salt complex decreases by 43 degrees upon decreasing the salt concentration from that of the 6:1 complex to that of the 20:1 complex. Correspondingly, the conductivity of the 20:1 complex at 40 C is two orders of magnitude higher than that of the 6:1 complex. N-H stretching frequencies of linear and branched polyethyleneimine and their polymer-salt complexes were studied by infrared spectroscopy. An increase in frequency of the N-H stretching mode of both polymers is seen upon complex formation. Keywords: Polymer electrolytes, Ionic conductivity.
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