Self‐assembled anionic micellar template for polypyrrole, polyaniline, and their random copolymer nanomaterials

Abstract

We report an anionic surfactant approach for size and shape control in polyaniline, polypyrrole, and their polyaniline‐co‐polypyrrole random copolymer nanomaterials. A renewable resource azobenzenesulfonic acid anionic surfactant was developed for template‐assisted synthesis of these classes of nanomaterials. The surfactant exists as 4.3 nm micelle in water and self‐organizes with pyrrole to produce spherical aggregates. The sizes of the spherical aggregates were controlled by water dilution and subsequent oxidation of these templates, produced polypyrrole nanospheres of 0.5 μM to 50 nm dimensions. The anionic surfactant interacts differently with aniline and forms cylindrical aggregates, which exclusively produce nanofibers of ∼180 nm in diameter with length up to 3–5 μM. The template selectivity of surfactant toward aniline and pyrrole was used to tune the nanostructure of the aniline‐pyrrole random copolymers from nanofiber‐to‐nanorod‐to‐nanospheres. Dynamic light scattering technique and electron microscopes were used to study the mechanistic aspects of the template‐assisted polymerization. The four probe conductivity of the copolymers showed a nonlinear trend and the conductivity passes through minimum at 60–80% of pyrrole in the feed. The amphiphilic dopant effectively penetrates into the crystal lattices of the polymer chain and induces high solid state ordering in the homopolymer nanomaterials. © 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 830–846, 2009

A Comparative Study on Humidity Sensing Performances of Polyaniline and Polypyrrole Nanostructures

“…The observed peak at 2θ = 25.9°in Fig. 29 For PPy, the peak appeared at 2θ = 18.1°also indicates a semicrystalline structure for this polymer. The appearance of this peak suggests the semicrystalline structure for the PAni sample.…”

“…The lowangle small peak at 7.4°is attributed to an ordered arrangement of dopant in the PAni chain. 29 For PPy, the peak appeared at 2θ = 18.1°also indicates a semicrystalline structure for this polymer. 30 The lattice plane d-spacing (d) was calculated based on the Bragg's formula (λ = 2dsinθ).…”

Novel actuators based on polypyrrole/carbide-derived carbon hybrid materials

“…The peak around 200 nm refers to the pyrrole micelles. [26] The size distribution analysis of pyrrole, NaDBS and CDC mixture clearly shows the presence of the CDC particles in the solution with a size distribution of 0.5 to 1.5 µm and having a peak at 0.8 µm. The disappearance of first peak (~4 nm) which is present in pyrrole NaDBS solution is due to agglomeration of the small pyrrole-DBS micelles to CDC particles to form larger micelle structures.…”

Electrically Conductive Polystyrene/Polypyrrole Nanocomposites Prepared via Emulsion Polymerization

“…The peak at 1044 is related to C-H and N-H in-plane deformation vibration [40,41] . The vibration bands observed at 963 cm À1 and 780 cm À1 are due to the C-C out of plane ring deformation vibration and C-H out of plane ring deformation [41][42][43] . The spectra of the PS=PPy composites ( Fig.…”