Flower shaped microgel 3: synthesis of poly(2-hydroxyethylmethacrylate) core-polystyrene shell type microgels

Saito, Reiko; Akiyama, Yukina; Ishizu, Koji

doi:10.1016/s0032-3861(98)00333-4

Cited by 16 publications

(14 citation statements)

References 16 publications

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“…One of the most interesting properties of amphiphilic block copolymers is their ability to self‐assemble into a large variety of micellar structures 23. In this case, the formation of reverse micelles by PS 699 ‐ b ‐P(MMA 232 /MAA 58 ) in organic solvents was driven by the repulsive interaction between the nonpolar solvent and the MAA groups in the hydrolyzed PMMA block.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of functional poly(styrene)‐block‐(methyl methacrylate/methacrylic acid) by homogeneous reverse atom transfer radical polymerization: Spherical nanoparticles, thermal behavior, self‐aggregation, and morphological properties

Pizarro

Jeria‐Orell

Marambio

et al. 2013

J of Applied Polymer Sci

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This study investigates the use of homogeneous reverse atom transfer radical polymerization for the synthesis of polystyrene (PS) initiated by conventional radical peroxide with copper bromide in the lower oxidation state and a 2,2′‐bypyridine complex as the catalyst. In a second stage, an amphiphilic block copolymer containing methyl methacrylate (MMA) was synthesized via normal atom transfer radical polymerization in two steps, followed by partial hydrolysis of the methyl ester linkage of the MMA block under acidic conditions. The block copolymer PS699‐b‐P(MMA232/MAA58) obtained had a narrow molecular weight dispersity (Ð < 1.3). The structure of the precursor, PS‐b‐PMMA, and resultant polymer, was characterized and verified by FTIR and 1H‐NMR spectroscopy as well as size exclusion chromatography. The self‐aggregation of PS699‐b‐P(MMA232/MAA58) in organic solvents was monitored by UV spectroscopy, whereas the morphology and size of the formed microaggregates were investigated by transmission electron microscopy and dynamic light scattering. The results indicate that this copolymer formed regular spherical reverse micelles with a core–shell structure. The atomic force micrographs of PS699‐b‐P(MMA232/MAA58) showed a rough surface morphology owing to microphase separation of the block copolymer. In addition, thermal characterization was performed by differential scanning calorimetry and thermogravimetric analysis. The glass transition temperature of PS699‐b‐P(MMA232/MAA58) decreased significantly (65°C), when compared to PS and PMMA, suggesting that an enhanced movement of the polymer chains resulted by the segregation of the hydrolyzed P(MMA232/MAA58) block. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Section: Resultsmentioning

confidence: 99%

Synthesis of functional poly(styrene)‐block‐(methyl methacrylate/methacrylic acid) by homogeneous reverse atom transfer radical polymerization: Spherical nanoparticles, thermal behavior, self‐aggregation, and morphological properties

Pizarro

Jeria‐Orell

Marambio

et al. 2013

J of Applied Polymer Sci

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“…The increase in the size of the micro/nanoparticles is due to the increase in the copolymer's concentration (0.5 and 1 mg/ml, respectively) in the solvent (prepared in DMSO) respectively, and the larger size suggests the presence of aggregates in the systems. The formation of aggregates due to the aggregation of the P(HEMA) sequences in the solution is due to their compatibility between p(HEMA) and the solvent 16…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of poly(2‐hydroxyethylme thacrylate)‐b‐P(N‐phenylmaleimide)‐ZnO and poly(2‐hydroxy ethylmethacrylate)‐b‐P(styrene)‐ ZnO micro/nanostructures: micro/nanocomposite particles with core‐shell morphology

Pizarro

Marambio

Jeria‐Orell

et al. 2011

Polymers for Advanced Techs

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The present work reports the incorporation of the ZnO doped diblock copolymer matrix and its conversion into a self‐assembled structure. The diblock P(HEMA)80‐b‐P(N‐PhMI)20 and P(HEMA)90‐b‐P(St)10 copolymers consist of a majority (HEMA) and minority (N‐PhMI or St) block. The copolymers were synthesized with a block repeat unit ratio by atom‐transfer radical polymerization (ATRP) using a poly(2‐hydroxyethylmethacrylate)‐Cl/CuBr/bipyridine initiating system. The P(HEMA)‐Cl was prepared by reverse ATRP1. The average theoretical number molecular weight (Mn,th) was calculated from the feed capacity. The composite of the inorganic nanoparticles was achieved at room temperature in the liquid phase, using ZnCl2 precursor dopant and wet chemical processing to convert to ZnO nanoparticle films. Thermal characterization was performed using differential scanning calorimetry (DSC) and thermogravimetry (TG). The proton/area relationship confirmed the block copolymer compositions calculated by elemental analysis, consisting of a majority and minority blocks. Morphology properties of the polymer samples were investigated by scanning electron microscopy (SEM). The microphotographs of the film's surfaces show that the film's upper surfaces were generally smooth with ordered structure morphology. FT‐IR spectroscopy confirmed the association of the ZnCl2 precursor with the majority block and the formation of ZnO, the white SEM showed the morphology of ZnO nanoparticles' films when the surface relief changes principally due to surface loss rather than its orientation. Copyright © 2009 John Wiley & Sons, Ltd.

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“…A facile and direct homogeneous solution polymerization approach for hydroxyethyl methacrylate and methacrylic acid nanogels was developed in a single step without the use of oleophilic surfactants [164]. It is possible to produce more complex architectural nanogels using anionic polymerization in solution and as small as 3-30 nm in size [165][166][167].…”

Section: Solution Polymerizationmentioning

confidence: 99%

Nanogels: Chemistry to Drug Delivery

Yallapu

Reddy

Labhasetwar

2007

Biomedical Applications of Nanotechnology

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Flower shaped microgel 3: synthesis of poly(2-hydroxyethylmethacrylate) core-polystyrene shell type microgels

Cited by 16 publications

References 16 publications

Synthesis of functional poly(styrene)‐block‐(methyl methacrylate/methacrylic acid) by homogeneous reverse atom transfer radical polymerization: Spherical nanoparticles, thermal behavior, self‐aggregation, and morphological properties

Synthesis of functional poly(styrene)‐block‐(methyl methacrylate/methacrylic acid) by homogeneous reverse atom transfer radical polymerization: Spherical nanoparticles, thermal behavior, self‐aggregation, and morphological properties

Preparation and characterization of poly(2‐hydroxyethylme thacrylate)‐b‐P(N‐phenylmaleimide)‐ZnO and poly(2‐hydroxy ethylmethacrylate)‐b‐P(styrene)‐ ZnO micro/nanostructures: micro/nanocomposite particles with core‐shell morphology

Nanogels: Chemistry to Drug Delivery

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