Formation mechanism of an “onionlike” multilayered structure by reconstruction of the Tmorphology of micron-sized, monodisperse poly(methyl methacrylate)\polystyrene composite particles with the solvent-absorbing\solvent-releasing method

The formation mechanism of the onionlike multilayered morphology of micron-sized, monodisperse poly(methyl methacrylate) (PMMA)\polystyrene (PS) (1\1 w\w) composite particles by the solvent-absorbing\solvent-releasing method was discussed. It was concluded that the orientation of PMMA components at the outer interface of tolueneswollen particles with water is the trigger and that PMMA-g-PS operates to stabilize inner multilayer interfaces for the formation of the onionlike multilayered morphology.