Synthesis of nano-sized magnetic colloidal particles from ferrous salts and hydroxylated poly(butyl methacrylate-b-glycidyl methacrylate)

Bao, Hongda; Chen, Z.; Xu, Wenlan; Wu, Peiheng; Wang, Y.; Gao, Baojiao; Liu, Jinliang

doi:10.1134/s1061933x06050176

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…Moreover, it is essential that such formulations are efficiently stirred to ensure that micrometer-sized monomer droplets are generated, otherwise there is insufficient interfacial area between this water-immiscible reagent and the aqueous continuous phase to enable the polymerization to proceed. The kinetics of emulsion polymerization have been monitored in situ using 1 H nuclear magnetic resonance (NMR) spectroscopy coupled with a flow cell or by utilizing Raman or near-IR spectroscopy . However, such techniques do not provide any information regarding the evolution in particle morphology during the polymerization.…”

Section: Introductionmentioning

confidence: 99%

“…The kinetics of emulsion polymerization have been monitored in situ using 1 H nuclear magnetic resonance (NMR) spectroscopy coupled with a flow cell 9 or by utilizing Raman 10 or near-IR spectroscopy. 11 However, such techniques do not provide any information regarding the evolution in particle morphology during the polymerization. Over the past decade or so, there has been considerable interest in conducting aqueous emulsion polymerizations using pseudo-living radical polymerization.…”

Section: ■ Introductionmentioning

confidence: 99%

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In Situ Small-Angle X-ray Scattering Studies During Reversible Addition–Fragmentation Chain Transfer Aqueous Emulsion Polymerization

et al. 2019

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Polymerization-induced self-assembly (PISA) is a powerful platform technology for the rational and efficient synthesis of a wide range of block copolymer nano-objects (e.g., spheres, worms or vesicles) in various media. In situ small-angle X-ray scattering (SAXS) studies of reversible addition–fragmentation chain transfer (RAFT) dispersion polymerization have previously provided detailed structural information during self-assembly (see 30155157 Chem. Sci. 2016 7 5078 5090 ). However, conducting the analogous in situ SAXS studies during RAFT aqueous emulsion polymerizations poses a formidable technical challenge because the inherently heterogeneous nature of such PISA formulations requires efficient stirring to generate sufficiently small monomer droplets. In the present study, the RAFT aqueous emulsion polymerization of 2-methoxyethyl methacrylate (MOEMA) has been explored for the first time. Chain extension of a relatively short non-ionic poly(glycerol monomethacrylate) (PGMA) precursor block leads to the formation of sterically-stabilized PGMA-PMOEMA spheres, worms or vesicles, depending on the precise reaction conditions. Construction of a suitable phase diagram enables each of these three morphologies to be reproducibly targeted at copolymer concentrations ranging from 10 to 30% w/w solids. High MOEMA conversions are achieved within 2 h at 70 °C, which makes this new PISA formulation well-suited for in situ SAXS studies using a new reaction cell. This bespoke cell enables efficient stirring and hence allows in situ monitoring during RAFT emulsion polymerization for the first time. For example, the onset of micellization and subsequent evolution in particle size can be studied when preparing PGMA 29 -PMOEMA 30 spheres at 10% w/w solids. When targeting PGMA 29 -PMOEMA 70 vesicles under the same conditions, both the micellar nucleation event and the subsequent evolution in the diblock copolymer morphology from spheres to worms to vesicles are observed. These new insights significantly enhance our understanding of the PISA mechanism during RAFT aqueous emulsion polymerization.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

In Situ Small-Angle X-ray Scattering Studies During Reversible Addition–Fragmentation Chain Transfer Aqueous Emulsion Polymerization

et al. 2019

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“…Emulsion and dispersed media polymerization have been utilized to encapsulate iron oxide nanoparticles into polymeric micro and nanospheres. These materials typically trap numerous iron oxide nanoparticles in polymeric matrices prepared by free radical polymerizable monomers [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of magnetite (Fe₃O₄)—Polyvinyl alcohol‐based nanocomposites and study of superparamagnetism

Bajpai¹

2009

Polymer Composites

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The aim of this investigation was to design iron oxide containing nanocomposites which could display superparamagnetic behavior and thus find application in biomedical and allied fields. To achieve the proposed objectives methyl methacrylate was polymerized by a redox system comprising of metabisulphite and persulphate in the immediate presence of a crosslinker, N,N 0methylene bis acrylamide and a preformed polymer, i.e., polyvinyl alcohol. Into the prepared polymer matrix nanosized magnetite (Fe 3 O 4 ) particles were evenly dispersed by in situ precipitation of Fe 2+ /Fe 3+ ions. The nanocomposite materials were characterized by techniques like FTIR, SEM, TEM, XRD, and DSC. The magnetic behavior of nanocomposites and bulk magnetite particles was studied under varying applied magnetic fields and their superparamagnetic property was examined. The iron-oxide polymer nanocomposites were also studied for microhardness. POLYM. COMPOS., 31:245-255, FIG. 2. SEM image of (a) iron oxide impregnated gel of definite composition: [PVA] ¼ 2.0 g, [MMA] ¼ 9.35 mM, [MBA] ¼ 0.06 mM, and (b) TEM image of iron oxide nanoparticles.

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Preparation of Porous Magnetic Nanocomposite Materials Using Highly Concentrated Emulsions as Templates

Ghosh

Vílchez

Esquena

et al. 2011

Trends in Colloid and Interface Science XXIV

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Synthesis of nano-sized magnetic colloidal particles from ferrous salts and hydroxylated poly(butyl methacrylate-b-glycidyl methacrylate)

Cited by 6 publications

References 11 publications

In Situ Small-Angle X-ray Scattering Studies During Reversible Addition–Fragmentation Chain Transfer Aqueous Emulsion Polymerization

In Situ Small-Angle X-ray Scattering Studies During Reversible Addition–Fragmentation Chain Transfer Aqueous Emulsion Polymerization

Synthesis and characterization of magnetite (Fe₃O₄)—Polyvinyl alcohol‐based nanocomposites and study of superparamagnetism

Preparation of Porous Magnetic Nanocomposite Materials Using Highly Concentrated Emulsions as Templates

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Synthesis of nano-sized magnetic colloidal particles from ferrous salts and hydroxylated poly(butyl methacrylate-b-glycidyl methacrylate)

Cited by 6 publications

References 11 publications

In Situ Small-Angle X-ray Scattering Studies During Reversible Addition–Fragmentation Chain Transfer Aqueous Emulsion Polymerization

In Situ Small-Angle X-ray Scattering Studies During Reversible Addition–Fragmentation Chain Transfer Aqueous Emulsion Polymerization

Synthesis and characterization of magnetite (Fe3O4)—Polyvinyl alcohol‐based nanocomposites and study of superparamagnetism

Preparation of Porous Magnetic Nanocomposite Materials Using Highly Concentrated Emulsions as Templates

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Synthesis and characterization of magnetite (Fe₃O₄)—Polyvinyl alcohol‐based nanocomposites and study of superparamagnetism