Accession Number : ADA183933

Title :   Ionic Conductivity in Branched Polyethyleneimine Sodium Trifluoromethanesulfonate Complexes. Comparison to Analogous Complexes Made with Linear Polyethyleneimine,

Corporate Author : NORTHWESTERN UNIV EVANSTON IL

Personal Author(s) : Harris,Caroline S ; Ratner,Mark A ; Shriver,Duward F

PDF Url : ADA183933

Report Date : 24 Aug 1987

Pagination or Media Count : 23

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.

Descriptors :   *ETHYLENEIMINES, *SOLID ELECTROLYTES, *IONIC CURRENT, *X RAY DIFFRACTION, *FLUORINE COMPOUNDS, *METHANE, *SODIUM, *SULFONATES, GLASS, TRANSITION TEMPERATURE, INFRARED SPECTROSCOPY, AMINES, SALTS, POLYMERS, CRYSTALS, CONDUCTIVITY, SYNTHESIS(CHEMISTRY), RATIOS, METHYL RADICALS

Subject Categories : Polymer Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE