Preparation of micron-sized, monodispersed, "onion-like" multilayered poly(methyl methacrylate)/polysterene composite particles by reconstrution of morphology with the solvent-absorbing/releasing method

Micron-sized, monodispersed, "onion-like" multilayered poly(methyl methacry late) (PMMA)/polystyrene (PS) (1/1, w/w) composite particles were prepared by the solvent-absorbing/releasing method (SARM). The viscosity within tolu ene-swollen composite particles, the release rate of toluene therefrom, the PMMA/PS ratio, and the kind of solvent had great influences on the reconst ruction of the morphology of the PMMA/PS composite particles by the SARM. F rom these results, the conditions for the preparation of the multilayered c omposite particles by the SARM are clarified.