Abstract
Complexes between branched polyethylenimine and NaSO3CF3 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 polyethylenimine which forms partially crystalline complexes at ratios above 6:1 (lower salt concentrations). The 6:1 complex of branched polyethylenimine has a higher Tg (12°C) and a lower conductivity (10-8 S/cm at 40°C) than the corresponding complex of linear polyethylenimine (-5°C and 10-7 S/cm). The glass transition temperature of the polymer-salt complex decreases by 43 deg 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 2 orders of magnitude higher than that of the 6:1 complex. N-H stretching frequencies of linear and branched polyethylenimines 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.
| Original language | English |
|---|---|
| Pages (from-to) | 1778-1781 |
| Number of pages | 4 |
| Journal | Macromolecules |
| Volume | 20 |
| Issue number | 8 |
| Publication status | Published - 1987 |
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ASJC Scopus subject areas
- Materials Chemistry
Cite this
Ionic conductivity in branched polyethylenimine-sodium trifluoromethanesulfonate complexes. Comparisons to analogous complexes made with linear polyethylenimine. / Harris, Caroline S.; Ratner, Mark A; Shriver, Duward F.
In: Macromolecules, Vol. 20, No. 8, 1987, p. 1778-1781.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Ionic conductivity in branched polyethylenimine-sodium trifluoromethanesulfonate complexes. Comparisons to analogous complexes made with linear polyethylenimine
AU - Harris, Caroline S.
AU - Ratner, Mark A
AU - Shriver, Duward F.
PY - 1987
Y1 - 1987
N2 - Complexes between branched polyethylenimine and NaSO3CF3 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 polyethylenimine which forms partially crystalline complexes at ratios above 6:1 (lower salt concentrations). The 6:1 complex of branched polyethylenimine has a higher Tg (12°C) and a lower conductivity (10-8 S/cm at 40°C) than the corresponding complex of linear polyethylenimine (-5°C and 10-7 S/cm). The glass transition temperature of the polymer-salt complex decreases by 43 deg 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 2 orders of magnitude higher than that of the 6:1 complex. N-H stretching frequencies of linear and branched polyethylenimines 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.
AB - Complexes between branched polyethylenimine and NaSO3CF3 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 polyethylenimine which forms partially crystalline complexes at ratios above 6:1 (lower salt concentrations). The 6:1 complex of branched polyethylenimine has a higher Tg (12°C) and a lower conductivity (10-8 S/cm at 40°C) than the corresponding complex of linear polyethylenimine (-5°C and 10-7 S/cm). The glass transition temperature of the polymer-salt complex decreases by 43 deg 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 2 orders of magnitude higher than that of the 6:1 complex. N-H stretching frequencies of linear and branched polyethylenimines 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.
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M3 - Article
AN - SCOPUS:0001190907
VL - 20
SP - 1778
EP - 1781
JO - Macromolecules
JF - Macromolecules
SN - 0024-9297
IS - 8
ER -