β-Cyclodextrin improves the linearity of polyaniline synthesized enzymatically in AOT micellar solution

• Conducting and soluble PANI was biosynthesized in AOT micellar solution.
• Both AOT and β-cyclodextrin are compatible with laccase.
• The complex of β-cyclodextrin with aniline favors para-coupled polymerization.
• AOT is doped in PANI chain while β-cyclodextrin does not thread on it.

The influence of β-cyclodextrin (β-CD) on the laccase-catalyzed aniline polymerization in sodium bis-(2-ethylhexyl)sulfosuccinate (AOT) micellar solution is first presented. Results show that the anionic AOT micelle is compatible with laccase and β-CD also has little negative effect on the expression of the catalytic activity of laccase. β-CD can improve the linearity or conductivity of polyaniline biosynthesized in AOT micellar solution. Component analysis shows that AOT is doped in polyaniline chain while β-CD does not thread on the polyaniline chain. Mechanism analysis indicates that the improvement of the linearity of polyaniline by β-CD is due to steric hindrance close to the ortho-position of aniline, which favors the para-coupled aniline polymerization.

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