Modification of Monodisperse Colloidal Silica by Radical Copolymerizatoin of Cationic Surface Active Vinyl Monomers

Abstract

Adsorption and polymer modification of colloidal silica by radical copolymerization of surface active monomers, i.e., polymerizable surfactant having a vinyl end group, were investigated. Radical copolymerization of amide ammonium monomer and ammonium-type cross-linker (monomer) using a initiator of 2,2 0 -azobis(2-amidinopropane) dihydrochloride on colloidal silica successfully led to the formation of monodispersed cross-linked polymer/SiO 2 composites, which is stable in organic solvents. Addition of carboxylic acid monomer to the reaction system of two ammonium monomers gave homogeneously polymer-coated silica composites having carboxyl groups. The composites show -potential of À36 mV and 0 mV in water and ethanol, respectively. KEY WORDS: Colloidal Silica / Radical Copolymerization / Surface Active Monomer / Adsorption / Inorganic-organic composite nanoparticles have attracted much interest, because they possess properties of both inorganic particles and organic molecules, thereby leading to extensive potential applications in various fields of materials science.

Structural estimation of particle arrays at air–water interface based on silica particles with well‐defined and highly grafted poly(methyl methacrylate)

“…Surface modifications of inorganic particles have been widely studied [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Surface graft polymerization is one of the most effective and versatile methods used in making many of these modifications.…”