Production of crosslinked, hollow nanoparticles by surface‐initiated living free‐radical polymerization

Abstract

Surface‐initiated living free‐radical polymerization is employed in a multistep procedure to prepare hollow polymeric nanocapsules. Initially, trichlorosilyl‐substituted alkoxyamine initiating groups are attached to the surface silanol groups of silica nanoparticles. This surface layer of initiating groups is then used to grow functionalized linear chains leading to a core–shell morphology. The choice of functional groups is governed by their ability to undergo facile crosslinking reactions, with both active ester and benzocyclobutene groups being examined. Under either chemical or thermal conditions, the reaction of these functionalities gives a crosslinked polymeric shell that is covalently attached to, and surrounds, the central silica core. Removal of the silica core with HF then gives the hollow polymeric nanocapsules, which are stable under solvent dissolution and thermal treatment because of their crosslinked structure. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 1309–1320, 2002

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

“…Surface-Initiated ARGET ATRP of MMA on SiO 2 Nanoparticle Surface-initiated ARGET ATRP of MMA on SiO 2 nanoparticles mediated by copper (Scheme 1) was carried out in the presence of the free initiator to control not only the graft polymerization but also to easily measure the molecular weight (and its distribution) of the resulting grafted PMMA [18,19,[32][33][34][35]. Table 1 shows the experimental conditions and properties of PMMA by surface-initiated ARGET ATRP at 608C.…”

Surface treatment and characterization: Perspectives to electrophoresis and lab‐on‐chips

“…Indeed, it was demonstrated that the thickness of the polymer layer increased linearly with the conversion. Blomberg et al [194] have also used this strategy on silica particles, using the copolymerization of styrene with a monomer that can be thermally cross-linked, thus giving core-shell particles. Using hydrofluoric acid to remove the silica core, authors obtained hollow cross-linked polymer spheres.…”

Development of an Analytical Procedure to Determine Partition Coefficients of Selected Model Migrants between Lowdensity Polyethylene and Polyamide and Nanocomposite Polyamide

“…Organic-inorganic nanocomposites have hybrid properties derived from synergistic reactions of the two components. The most promising composite systems are nanocomposites based on organic polymers and inorganic clay minerals [1][2][3][4][5].…”