Controlled preparation of core-shell polystyrene/polypyrrole nanocomposite particles by a swelling-diffusion-interfacial polymerization method

摘要

Polystyrene/polypyrrole (PS/PPy) core-shell nanocomposite particles with uniform and tailored morphology have been successfully synthesized using the "naked" PS particulate substrate with the aid of a proposed strategy, the so-called swelling-diffusion-interfacial polymerization method. After initially forming pyrrole-swollen PS particles, diffusion of the monomer toward the aqueous phase was controlled through the addition of hydrochloric acid, eventually leading to its polymerization on the substrate particle surface. This process allows the nanocomposite particles to possess uniform and intact PPy overlayer and affords much more effective control over the structure and morphology of the resultant nanocomposites by simply changing the PS/pyrrole weight ratio or the addition amount of the doping acid. In particular, the nanocomposite particles with a thin, uniform, and intact PPy overlayer and their corresponding PPy hollow particles were obtained at a low addition amount of pyrrole. The resultant nanocomposite particles have been extensively characterized using scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, and thermogravimetry.