2002 Macromolecules

In summary, polyaniline (PANI) particles were prepared in a micellar solution composed of various molecular weights of hydrophobically end-capped poly(ethylene oxide)s (HEURs). Not only the “ringlike” shape of PANI particles but also the crystallinity and the conductivity strongly depend on the size of micelle, which could be controlled by changing the length of poly(ethylene oxide) middle block and the amount of aniline. Polymerization of aniline occurs at the micelle−water interface and around hydrophilic PEO chain loop in an aqueous system, and PEO chain can act as a steric stabilizer. The particles start to polymerize at the oil−water interface separated by the polymer surfactant, and the “ringlike” shape and structure were confirmed by transmission electron microscopy (TEM) images and X-ray diffractometer (XRD). The conductivity of pure PANIs strongly depends on the regular distribution of conducting phase and the structure of PANI prepared in HEUR micelles.