Polyaniline, supramolecular structures

Dufour, B., P. Rannou, P. Fedorko, D. Djurado, J.P Travers, and A. Pron. 2001. Effect of plasticizing dopants on spectroscopic properties, supramolecular structure, and electrical transport in metallic polyaniline. Chem Mat 13 4032. 

Ikkala, O.T., L.O. Pietilac, P. Passiniemi, T. Vikki, H. Osterholm, L. Ahjopalo, and J.E. Osterholm. 1997. Processible polyaniline complexes due to molecular recognition Supramolecular structures based on hydrogen bonding and phenyl stacking. Synth Met 84 55. 

Fig. 10. Panel A shows saxs patterns obtained from a polyaniline salt-4-hexylresorcinol supramolecular arrangement in a hexagonal register, which is evident from the 1, V3, 2 Q -spacing of the diffraction peaks. Panel B shows the structure that could be deduced from the diffraction patterns. The cylinders are formed of the polyaniline salt combined with the phenolic groups of the 4-hexylresorcinol. The hexyl tails microphase separate from the cylinders and act as spacers between them.

In the case of polyaniline samples the increase in reflection coefficient is correlated to the increase in static conductivity. In the case of poly(alk)dthiophene)s, we found out that control of molecular structure permits to increase conductivity at molecular level but is not sufficient to insure high level of static conductivity of the material. Moreover no correlation was found between static conductivity and reflection coefficient in the infirared domain. In fiict static conductivity is not only influenced by molecular parameters but also by structural parameters at supramolecular scale. The effect of structural parameters on microwave properties of low conductivity sanoples ( 10 -5 S.cm ) has already heea reported (2). By increasing the conductivity we have shown that microwave properties for Ugh conductivity sanq>les will only depend on the static conductivity and thickness of samples in term of absoibed, reflected and transmitted power for a givoi fi-equency. Differoit materials such as polypyrrole, polyaniline or indium tin oxide deposits were found to give same results en the surface resistance of the deposits was k t the same. 

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