Development of a Conductive Coating with Polyaniline
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Polyaniline (PANI) is considered as one of the most promising electrically conducting polymers due to its low density, good environmental stability, moderate conductivity and inexpensive polymerization. Commonly, polyaniline exits in three oxidation states: the fully reduced leucoemeraldine base (LEB), the half-oxidized emeraldine base (EB), and the fully oxidized pernagraniline base (PNB). Among all forms, only the half, oxidized EB is electrically conductive when it is doped or protonated to the salt form. There are two routes to introduce counter ions into the polymer chain. The first method is to perform polymerization of aniline oxidation with ammonium peroxydisulfate in acidic solutions. PANI synthesized this way is protonated in parts. The second method is to simply protonate the already prepared EB with an acid either by mechanically blending with a solid acid or by immersing it in the solution of an acid. This is the only way to achieve uniform protonation. Polyaniline’s poor solubility has been limiting it to maximize its performance, especially with higher molecular weight polymer. It is not soluble in conventional organic solvents but in solutions such as N-methyl-2- pyrrolidinone (NMP), which permits gelations to occur. Another debatable issue is the effectiveness of different sizes dopants. Smaller size dopants will be able to attack the protonation sites more easily since the polymer backbone is bent at a 120 angle. On the other hand, larger size dopants can force the polymer backbone to rearrange.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- DOE Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1082235
- Report Number(s):
- LA-UR--13-24027
- Country of Publication:
- United States
- Language:
- English
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