Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 7793 - 7797 |
| Number of pages | 5 |
| Journal | Macromolecules |
| Volume | 38 |
| Issue number | 18 |
| DOIs | |
| Publication status | Published - 2005 |
| MoE publication type | A1 Journal article-refereed |
Fingerprint
Cite this
}
Electrical conductivity transitions and self-assembly in comb-shaped complexes of polyaniline based on crystallization and melting of the supramolecular side chains. / Vilkman, Marja; Kosonen, Harri (Corresponding Author); Nykänen, Antti; Ruokolainen, Janne; Torkkeli, Mika; Serimaa, Ritva; Ikkala, Olli (Corresponding Author).
In: Macromolecules, Vol. 38, No. 18, 2005, p. 7793 - 7797.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Electrical conductivity transitions and self-assembly in comb-shaped complexes of polyaniline based on crystallization and melting of the supramolecular side chains
AU - Vilkman, Marja
AU - Kosonen, Harri
AU - Nykänen, Antti
AU - Ruokolainen, Janne
AU - Torkkeli, Mika
AU - Serimaa, Ritva
AU - Ikkala, Olli
N1 - Project code: T4SU00236
PY - 2005
Y1 - 2005
N2 - We report self-assembly and electronic conductivity transitions in polyaniline (PANI) where the iminic nitrogens are protonated by sulfonic acid-terminated low molecular weight poly(ethylene oxide) CH3−(O−C2H4−)46−CH2−SO3H (PEOSA), i.e., which contains 46 ethylene oxide repeat units. The complex PANI(PEOSA)0.5 self-assembles due to the comb-shaped architecture consisting of the PANI backbone and the supramolecular PEO side chains, as characterized using small- and wide-angle X-ray scattering (SAXS and WAXS) and transmission electron microscopy (TEM). PEO in the complex PANI(PEOSA)0.5 is crystalline near room temperature; TEM and SAXS indicate lamellar self-assembly with a long period of ca. 150 Å, and the conductivity is of the order 10-4 S/cm. A collapse of the self-assembly periodicity to 115 Å is observed at ca. 55 °C during a slow heating at 1 °C/min, and the conductivity drops stepwise to ca. half of the value as the PEO chains melt. Even if the observed conductivity transition is still relatively small, it is reproducible and reversible upon heating and cooling, with some hysteresis. We expect that the concept can be developed to open new possibilities for responsive conjugated polymers.
AB - We report self-assembly and electronic conductivity transitions in polyaniline (PANI) where the iminic nitrogens are protonated by sulfonic acid-terminated low molecular weight poly(ethylene oxide) CH3−(O−C2H4−)46−CH2−SO3H (PEOSA), i.e., which contains 46 ethylene oxide repeat units. The complex PANI(PEOSA)0.5 self-assembles due to the comb-shaped architecture consisting of the PANI backbone and the supramolecular PEO side chains, as characterized using small- and wide-angle X-ray scattering (SAXS and WAXS) and transmission electron microscopy (TEM). PEO in the complex PANI(PEOSA)0.5 is crystalline near room temperature; TEM and SAXS indicate lamellar self-assembly with a long period of ca. 150 Å, and the conductivity is of the order 10-4 S/cm. A collapse of the self-assembly periodicity to 115 Å is observed at ca. 55 °C during a slow heating at 1 °C/min, and the conductivity drops stepwise to ca. half of the value as the PEO chains melt. Even if the observed conductivity transition is still relatively small, it is reproducible and reversible upon heating and cooling, with some hysteresis. We expect that the concept can be developed to open new possibilities for responsive conjugated polymers.
U2 - 10.1021/ma0502856
DO - 10.1021/ma0502856
M3 - Article
VL - 38
SP - 7793
EP - 7797
JO - Macromolecules
JF - Macromolecules
SN - 0024-9297
IS - 18
ER -