Synthesis of double-responsive magnetic latex particles via seeded emulsion polymerization using macroRAFT block copolymers as stabilizers

Abstract

We report the synthesis of magnetic latex particles decorated with double-responsive PDMAEMA segments with fast magnetic response via RAFT-assisted emulsion polymerization, highlighting this strategy as a powerful tool for magnetic carriers design.

Self-assembly of amphiphilic poly(styrene-b-acrylic acid) on magnetic latex particles and their application as a reusable scale inhibitor

“…A promising technique to overcome this issue is based on the design of MNMs with high iron oxide nanoparticles encapsulated into polymer particles (functionalized by active groups). 12,13 Magnetic nanosorbents or magnetic polymeric nanoparticles (MPNPs) have been prepared by a wide range of techniques, including miniemulsion and seed emulsion polymerizations. [14][15][16][17] In our previous work, MPNPs selffunctionalized with carboxylic groups were fabricated via a miniemulsion polymerization.…”

Organic–inorganic hybrid functional materials by nitroxide-mediated polymerization

“…In recent years, magnetic iron oxide nanoparticles such as magnetite (Fe3O4) or maghemite (γ-Fe2O3) have attracted great interest for a wide variety of different applications, from catalysis to bioengineering. Again, in most cases, their surface need to be functionalized to protect them from the surrounding environment and promote their dispersion in organic solutions or into polymer matrices [205][206][207][208]. Taking advantage of the high affinity of phosphonic acid groups for iron oxide surfaces, Matsuno and Takahara [201,209,210] reported the grafting of PS and poly(3-vinylpyridine) (P3VP) polymer chains from the surface of magnetite nanoparticles.…”

Polymer-encapsulation of iron oxide clusters using macroRAFT block copolymers as stabilizers: tuning of the particle morphology and surface functionalization

“…In our previous work, we demonstrated that the use of a crosslinker (namely, DVB) led to the encapsulation of IO clusters in a well-defined core-shell morphology. 49 In fact, for the system prepared in the absence of cross-linker in the monomer charge (100% styrene), the spherical clusters disassembled generating MLPs with a multi-encapsulated instead of a core-shell morphology. In the present work, seeded emulsion polymerization of styrene was thus first investigated using increasing amounts of DVB, while maintaining a fixed polymer content (PC theo = 12 wt%) and a fixed IO content (IOC theo = 10-11 wt%, based on overall monomer mass) (Exp.…”

“…1, Table 1). The PDMAEMA@clusters were prepared as reported previously, 49 and exhibited a spherical shape with a number average diameter of 71 nm and a relatively large particle size distribution (D w /D n = 1.58, Table S2, ESI †). The suspension was purified by magnetic washing to remove non-adsorbed macro-RAFTs, and used as seeds in emulsion polymerization of styrene using DVB as a cross-linking agent ( Table 1).…”

“…In a previous work, we demonstrated how we can exploit RAFT polymerization to design MLPs with a well-defined surface functionalization and a high IOC. 49 Our reported strategy (Scheme 1) was based on the initial preparation of a poly(2dimethylaminoethyl methacrylate)-b-polystyrene (PDMAEMA-b-PS) amphiphilic block copolymer via a two-step RAFT solution polymerization. An aqueous dispersion of IO clusters was next prepared via emulsification/solvent evaporation using the block copolymer as a stabilizer.…”