ABSTRACT
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
Experimental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Results and Discussion . . . . . . . . . . . . . . . . . . . . . . . 230
Binding of Secondary Polymer to
Composite 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Dispersibility of Composite 2 in Cosolvent . . . . 230
ESR Study of Spin-Labeled Secondary Polymer 231
z-Potential of Composite 2 . . . . . . . . . . . . . . . . . 231 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232
Preparation of ultrafine monodisperse hybride particles, dispersible in low polar organic solvent, from
monodisperse colloidal silica by two-step polymer modification was studied. Bindings of the secondary
polymer to monodisperse poly(maleic anhydride-styrene)-modified colloidal silica particles (120 nm)
have made the composites in low polar solvent dispersible. The dispersion of the particles in good
solvent for the secondary polymer is due to the steric repulsion of solvated polymer chains. The dispersibility
of the hybrid particles in poor solvent-rich solution was controlled by delicate balance between nonpolar-
nonpolar interaction and electrostatic repusion among the particles.
