title: Surface ATRP of hydrophilic monomers from ultrafine aqueous silica sols using anionic polyelectrolytic macroinitiators.
abstract: A convenient two-step route was developed to prepare new anionic ATRP macroinitiators from near-monodisperse poly(2-hydroxyethyl methacrylate) precursors by partial esterification with 2-bromoisobutyryl bromide, followed by esterification of the remaining hydroxyl groups using excess 2-sulfobenzoic acid cyclic anhydride. These new macroinitiators can be electrostatically adsorbed onto ultrafine cationic Ludox CL silica sols; subsequent surface polymerization of various hydrophilic monomers in aqueous solution at room temperature afforded a range of polymer-grafted ultrafine silica sols. The resulting sterically stabilized particles were characterized by dynamic light scattering, transmission electron microscopy, aqueous electrophoresis, FTIR spectroscopy, and elemental microanalyses.
authors.affiliation: Dainton Building, Department of Chemistry, The University of Sheffield, Brook Hill, Sheffield, South Yorkshire S3 7HF, UK. c.vo@sheffield.ac.uk
authors.forename: Cong-Duan
authors.initials: CD
authors.lastname: Vo
authors.forename: Andreas
authors.initials: A
authors.lastname: Schmid
authors.forename: Steven P
authors.initials: SP
authors.lastname: Armes
authors.forename: Kenichi
authors.initials: K
authors.lastname: Sakai
authors.forename: Simon
authors.initials: S
authors.lastname: Biggs