Chemistry

Pampered by PAAMPSA

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Science  20 Apr 2007:
Vol. 316, Issue 5823, pp. 341-343
DOI: 10.1126/science.316.5823.341d

The promise of polymer electronics depends in part on the development of stable conductive materials that can be inexpensively processed. One material that has been extensively studied is polyaniline (PANI), which when doped with acids becomes conductive but has limited solubility in common solvents. An alternative is to polymerize the aniline onto a polymer acid template that provides the acid doping, may enhance the PANI crystallinity, and may also provide excess pendant groups to enhance solubility. Yoo et al. explored the strongly acidic poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAAMPSA) as a template material. For the highest-molecular-weight PAAMPSA studied, the conductivity was high even though the acid doping was found to be incomplete. The best results (1.1 S/cm) were obtained for the lowest-molecular-weight template. 15N solid-state nuclear magnetic resonance spectroscopy suggested that the enhanced conductivity in these systems stemmed from a nitrogen environment in which the protonated amines can delocalize charge along the PANI-PAAMPSA backbone, an effect not seen in other polymer acid-doped systems. — MSL

J. Mater. Chem. 17, 1268 (2007).

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