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The reversible addition-fragmentation chain transfer (RAFT) copolymerization of non-ionized acrylic acid with acrylamide in dimethyl sulfoxide is investigated and compared with the conventional free radical process carried out at the same conditions. The effect of the living nature of the RAFT process on overall polymerization rate and on copolymer composition is studied by in situ 1H NMR. The same...
Spiropyran-containing polymer nanoparticles have found interesting applications in various fields. Here, redispersible multi-responsive latex nanoparticles have been prepared by using RAFT-mediated polymerization. Poly (dimethylamino ethyl methacrylate (DMAEMA)-b-methyl methacrylate (MMA)) was used as a pH-responsive reactive macro-RAFT surfactant (MRS) with molecular weight of 3390 g mol−1. Afterwards,...
Composite organic/inorganic latexes encapsulating iron oxide (IO) nanoparticles of maghemite (γ-Fe2O3) were successfully synthesized by surfactant-free reversible addition-fragmentation chain transfer (RAFT)-mediated emulsion polymerization. γ-Fe2O3 was first dispersed in an aqueous solution containing a statistical copolymer constituted of acrylic acid (AA) and n-butyl acrylate (BA) units, prepared...
Non-ionic poly(N-acryloylmorpholine) (PNAM)-decorated polystyrene (PS) particles were synthesized by polymerization-induced self-assembly (PISA) in emulsion, mediated by the reversible addition-fragmentation chain transfer (RAFT) technique, in a one-pot/two-step process. PNAM was first prepared by RAFT polymerization in water using 4-cyano-4-thiothiopropylsulfanyl pentanoic acid (CTPPA) as chain transfer...
Water-soluble polymers obtained by reversible addition-fragmentation chain transfer (RAFT) polymerization were used for the production of surfactant-free poly(vinylidene chloride) (PVDC)-based latexes in a one-pot/two-step process that was exclusively conducted in water. In the first step, the hydrophilic macromolecular RAFT (macroRAFT) agent (i.e. poly(acrylic acid) (PAA), poly(methacrylic acid)...
Polymer encapsulation of raw ferrofluids was carried out by free radical emulsion polymerization using macro-RAFT copolymers as stabilizers. The iron oxide cores with positively charged surface at the pH of encapsulation were dispersed in a solution of negatively charged random macro-RAFT copolymer by ultrasonication. Uniform polymer encapsulated super paramagnetic iron oxide nanoparticles (SPIONs)...
We have prepared CO2-switchable poly(methyl methacrylate) and polystyrene latexes where the stabilizing CO2-switchable moiety originated from either the monomer 2-dimethylaminoethyl methacrylate (DMAEMA) (copolymerized in situ) or previously synthesized poly(2-dimethylaminoethyl methacrylate)-block-poly(methyl methacrylate) (PDMAEMA-b-PMMA). The latexes can be aggregated by N2 and heat, and redispersed...
The synthesis of polystyrene-block-poly[2-(N-morpholino)ethyl methacrylate] (PS-b-PMEMA) as a new highly amphiphilic and multiple stimuli-responsive block copolymer is presented. To achieve high molecular weights far beyond 100 kDa in a highly controlled manner (dispersities < 1.1), a synthetic route via sequential combination of anionic polymerization for the PS block and reversible addition–fragmentation...
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