Production of micron-sized monodispersed core/shell polymethyl methacrylate/polystyrene particles by seeded dispersion polymerization

Okubo, Masayoshi; Izumi, Jin; Hosotani, T.; Yamashita, Tsuyoshi

doi:10.1007/s003960050150

Cited by 59 publications

(39 citation statements)

References 11 publications

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“…In conventional organic solvents, a suitable stabilizer is one that exhibits affinity for both the medium and the polymer particles. PVP is commonly used as a stabilizer in dispersion polymerizations in organic solvents 34–44. Since PVP was found to be soluble in [DEME][TFSI], PVP was the obvious initial choice as a stabilizer.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Polystyrene Particles by Dispersion Polymerization in an Ionic Liquid

Minami

Yoshida

Okubo

2008

Macromol. Rapid Commun.

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Submicron‐sized monodisperse polystyrene (PS) particles were successfully prepared by dispersion polymerization of styrene in an ionic liquid, N,N‐diethyl‐N‐methyl‐N‐(2‐methoxyethyl)ammonium bis(trifluoromethanesulfonyl)imide ([DEME][TFSI]) at 70 °C with poly(vinyl pyrrolidone) (PVP) as a stabilizer. At the optimum PVP and styrene concentrations with regard to preparation of stable polymer particles, the number‐average diameter and coefficient of variation were 350 nm and 5.7%, respectively. The particle size increased with a decrease in the PVP concentration and an increase in the styrene concentration. Moreover, we succeeded in producing PS particles by thermal polymerization in the absence of a radical initiator at 130 °C in [DEME][TFSI] using a conventional reactor (not autoclave) utilizing the advantages of non‐volatility and thermal stability of the ionic liquid.magnified image

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Section: Resultsmentioning

confidence: 99%

Preparation of Polystyrene Particles by Dispersion Polymerization in an Ionic Liquid

Minami

Yoshida

Okubo

2008

Macromol. Rapid Commun.

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“…Magnetic Poly(HEMA) Microspheres. To produce magnetic particles useful for biotechnological applications and analogous to core/shell particles produced by seeded dispersion polymerization (26, 27), we used magnetite as seeds in the dispersion polymerization of HEMA. Cellulose acetate butyrate and dibenzoyl peroxide were used as a steric stabilizer and initiator of the polymerization, respectively, which were, together with the monomer, adsorbed on magnetite dispersed in the reaction medium.…”

Section: Resultsmentioning

confidence: 99%

Properties of RNase A Immobilized on Magnetic Poly(2‐hydroxyethyl methacrylate) Microspheres

Horák

Rittich

Šafář

et al. 2001

Biotechnology Progress

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Magnetic hydrogel microspheres 1.5 microm in size were prepared by dispersion copolymerization of 2-hydroxyethyl methacrylate and ethylene dimethacrylate in the presence of magnetite, which formed the core of the particles. RNase A was coupled to the particles by the cyanuric chloride method. Gel electrophoresis of plasmid DNA pUC 19 (contaminated by bacterial RNA) confirmed RNA degradation with the immobilized enzyme. The effect of temperature and pH on the relative activity of immobilized RNase A was estimated after incubation of the samples at different temperatures (30-80 degrees C) and pH (4.0-8.0). Maximum relative activity was observed at 70 degrees C and pH 6.5. The matrices based on magnetic poly(HEMA) had a low tendency to adsorb RNA.

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“…Contrary to this, direct polymerization of acrylate monomers in the presence of SiO 2 particles under optimum conditions may result in the complete coverage of SiO 2 surface with long polymer chains, and additionally, the surface can also be modified with various functional groups using functional monomer. A core/acrylate monomer ratio (w/w) of 1/0.5 during seeded polymerization is reported to be enough for complete coverage of core particles . The complete coverage of SiO 2 particles by acrylate polymers would improve the dispersibility in the solvents for acrylate polymer and in the polymer matrix and also would open up the application potential of modified particles because of the presence of biocompatible poly‐acrylate layer.…”

Section: Introductionmentioning

confidence: 99%

Preparation of magnetically doped multilayered functional silica particles via surface modification with organic polymer

Rahman

Miah

Minami

et al. 2012

Polymers for Advanced Techs

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Magnetically modified functional particles are emerging as one of the most promising candidate in numerous multidisciplinary applications. In this research, a simple process has been developed to prepare magnetically modified aminated silica (SiO2) particles. Herein, submicron‐sized SiO2 particles were modified with poly(methylmethacrylate‐methacrylic acid) by seeded polymerization without any stabilizer. The carboxyl groups localized near the particles surface were then covalently linked with ethylene diamine to prepare aminated composite particles. Iron ions were then precipitated on the surface of aminated composite particles to obtain magnetically doped functional SiO2 particles. The preparation of such particles was confirmed by scanning electron microscopy, Fourier transform infrared, 1H NMR, X‐ray photoelectron spectroscopy and thermogravemetric analyses. Relative measurement of adsorption study of different biomolecules suggested that magnetically doped functional silica particles are comparatively hydrophobic. Copyright © 2012 John Wiley & Sons, Ltd.

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Production of micron-sized monodispersed core/shell polymethyl methacrylate/polystyrene particles by seeded dispersion polymerization

Cited by 59 publications

References 11 publications

Preparation of Polystyrene Particles by Dispersion Polymerization in an Ionic Liquid

Preparation of Polystyrene Particles by Dispersion Polymerization in an Ionic Liquid

Properties of RNase A Immobilized on Magnetic Poly(2‐hydroxyethyl methacrylate) Microspheres

Preparation of magnetically doped multilayered functional silica particles via surface modification with organic polymer

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