Poly(styrene) coating of monodispersed colloidal metal oxides by grafting to hydrophilic macromer adsorbed on the surface

Yoshinaga, Kohji; Yokoyama, Takafumi; Kito, Taketoshi

doi:10.1002/pat.1993.220040108

Cited by 22 publications

(10 citation statements)

References 7 publications

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“…The reaction of composite 6 with NsCl in the presence of pyridine gave colorless composite 7 having a surface NsO concentration in the range of 2.4x 10-5 to 3.4x 10-5 mol g-1 , which corresponds to 2.7-3.8 groups/ nm2, or one tenth that on composite 2. Composite 7 showed monodispersion, retained particles size and distribution of the original silica during coupling, cross-linking and esterification reactions, and redispersibility in organic solvents, such as EtOH.…”

Section: Preparation Of Poly(ma-st)-modified Silica Particles With Sumentioning

confidence: 99%

Cationic Graft-Polymerization of 2-Methyl-2-oxazoline on Monodispersed Polymer-Coated Ultrafine Silica Particles

Yoshinaga

Hidaka

1994

Polym J

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ABSTRACT:Cationic graft-polymerizations of 2-methyl-2-oxazoline on p-nitrobenzenesulfonate group-introduced silica composite particles, prepared by polymer coating of monodispersed colloidal silica of 470 nm in diameter, were studied. Ring-opening polymerization of the oxazoline was observed to take place on poly(styrene)-coated silica particles, derived from radical copolymerization of styrene, hydroxymethylstyrene and divinylbenzene, but most grafted polymer chains were dragged out for lack of cross-linking in the copolymer layer. The polymerization of the oxazoline on the composite surface, made from poly(maleic anhydride-styrene)-modified silica particles, led to the grafting of oligomer chains of octamer or nanomer, which were terminated by reaction with water molecules inside the particles.KEY WORDS Graft Polymerization / Ultrafine Particles / Monodispersed Colloidal Silica / Cationic Polymerization / Polymer Modification / Polyoxazoline / Monodispersed inorganic colloidal ultrafine particles are lately of interest for application to new functional materials, because of controllable size and spherical shape. 1 · 2 We have been developing composite materials exhibiting specific functionality from polymermodified colloidal silica particles. One goal is control of ordered structure in a polymer matrix or construction of reversible sol-gel systems, composed of unimodal colloidal particles, through surface hydrophobic or electrostatic interactions. Hence, surface polymercoating of colloidal particles and introduction of hydrophobicity or electric charges are markedly significant processes. In our previous work, we reported effective polymer-coating on colloidal silica particles by use of polymer silane coupling agents 3 .4 and radical polymerizations5·6 without particles aggregation. Functional groups of amino, carboxyl, 7 • 8 and hydroxyl 9 were efficiently introduced on the composite surface.

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Section: Preparation Of Poly(ma-st)-modified Silica Particles With Sumentioning

confidence: 99%

Cationic Graft-Polymerization of 2-Methyl-2-oxazoline on Monodispersed Polymer-Coated Ultrafine Silica Particles

Yoshinaga

Hidaka

1994

Polym J

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“…[1][2][3] Our group have been developing composite materials with specific functionality from inorganic colloidal particles through polymer modification. [4][5][6][7] Magnetic nanoparticles (MNPs) have potential applications in a range of areas, such as magnetic recording, 8,9 magnetic fluids [10][11][12] and biomedical materials. [13][14][15][16][17][18][19] In particular, MNPs have received considerable attention for immunoassays [17][18][19][20] on account of their strong magnetic properties, good separation-capability and low toxicity.…”

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confidence: 99%

Preparation of polymer-coated magnetite fine particles for immunoassay magnetic marker

et al. 2010

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Polymer-coated magnetite fine particles with carboxyl groups were developed for applications as an immunoassay magnetic marker. The magnetite composites were prepared using the following method. A hydrophilic macromer with a polymerizable vinyl group at the terminal was adsorbed on the surface of the magnetite fine particles. Subsequently, a hydrophilic vinyl monomer with a carboxyl group and a crosslinking agent were added to carry out a copolymerization reaction. The resulting magnetite composite particles were dispersed stably in an aqueous medium. The composite particles exhibited high antibody binding ability and high-sensitive magnetic properties suitable for applications as magnetic markers.

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“…[3][4][5] It is possible to attain a new kind of functional materials by using polymer silane on the surface of the inorganic colloidal particle through covalent bonding. [6][7][8] Chemical modification on the surface of inorganic particles has been employed to improve dispersibility and compatibility in organic solvent, thus providing a processing route that is different from sol-gel process for preparing organic-inorganic hybrid composites. 9,10 Furthermore, when amino, carboxyl or hydroxyl groups got introduced to the surface of inorganic particles, dispersibility of inorganic composite particles, mainly silica, had been greatly increased.…”

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Cross-linking of Grafted Copolymer on Colloidal Silica and Introduction of Surface Amino Group

Lee

Kim

Lee

et al. 2007

Polym J

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ABSTRACT:To obtain polymer-modified silica (550 nm diameter), trimethoxysilyl-terminated poly(glycidyl methacrylate-co-methyl methacrylate) with epoxy ring (to prevent the formation of carboxyl group) was successfully synthesized. Then, the cross-linking of the grafted copolymer on silica was made using ethylenediamine or hexamethylenediamine of varying alkyl chain lengths, and the stability of cross-linked silica particles was investigated in alkaline aqueous solution. Cross-linked polymer-modified silica based on diamines exhibited much lower reduction rate (in wt %) of the attached polymer to silica than uncross-linked polymer-modified silica. In particular, cross-linked silica composites by ethylenediamine had more stability than cross-linked silica composites by hexamethylenediamine. Finally, the cross-linking reaction of grafted-polymer on silica particles by diamines was confirmed by the 13 C CP/ MAS NMR spectra measured on polymer-modified silica composites.

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Poly(styrene) coating of monodispersed colloidal metal oxides by grafting to hydrophilic macromer adsorbed on the surface

Cited by 22 publications

References 7 publications

Cationic Graft-Polymerization of 2-Methyl-2-oxazoline on Monodispersed Polymer-Coated Ultrafine Silica Particles

Cationic Graft-Polymerization of 2-Methyl-2-oxazoline on Monodispersed Polymer-Coated Ultrafine Silica Particles

Preparation of polymer-coated magnetite fine particles for immunoassay magnetic marker

Cross-linking of Grafted Copolymer on Colloidal Silica and Introduction of Surface Amino Group

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