Crosslinking of the inner poly(methyl methacrylate) core of poly(α-methylstyrene-b-methyl methacrylate) micelles in selective solvent: 1. Effect of solvent selectivity

Saito, Reiko; Ishizu, Koji; Fukutomi, Takashi

doi:10.1016/0032-3861(90)90289-b

Cited by 40 publications

(24 citation statements)

References 12 publications

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“…When n-hexane was added, first, homo-PMMA and the PMMA microgels without PMeSt sequences precipitated, and then the material block copolymer no. 6 and the random mixing microgels precipitated. The random mixing microgels and block copolymer no.…”

Section: Turbidimetric Titrationmentioning

confidence: 99%

“…The Bz(v)/BuOH(v) = 40/60 mixture, in which the material block copolymer no. 6 and the microgels did not dissolve but swelled well, was used as the solvent for this measurement. The observed values are summarized in Table 111.…”

Section: Solvent Compositions In the Swollen Microgelsmentioning

confidence: 99%

“…This cross-linked polymer micelle was the microgel with the cross-linked core and soluble shell. 6 The microgels synthesized by this method could be considered as a fixed polymer mi-celle. In previous papers,6-8 it was reported that the size and the shape of the microgels could be controlled by changing the selectivity of the solvent and the polymer concentration.…”

Section: Introductionmentioning

confidence: 99%

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Structural effect of the microgels with a core‐shell morphology synthesized from poly(α‐methylstyrene‐b‐methyl methacrylate) on the swelling behavior of the microgel

Saito

Ishizu

Fukutomi

1991

J of Applied Polymer Sci

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SYNOPSISThe swelling behavior of the core-shell microgels [ 32 mol % poly(methy1 methacrylate) (PMMA) core and 68 mol % poly( a-methylstyrene) (PMeSt) shell], the random mixing microgels with 32 mol % PMMA and 68 mol % PMeSt, and the PMMA microgels was investigated in two solvent systems (toluene/n-hexane and benzeneln-butanol) by turbidimetric titrations from the viewpoint of the structural effect of the microgels. All coreshell microgels did not precipitate in the solvent in which the material block copolymer had perfectly precipitated. For the core-shell microgels, the flat regions appeared on the way to perfect turbidity. From the measurement of the composition of the solvent swollen in the polymers and the microgels, it was determined that these anomalous phenomena were due to the properties of the polymer micelles in the core-shell microgels.

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Section: Turbidimetric Titrationmentioning

confidence: 99%

Section: Solvent Compositions In the Swollen Microgelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural effect of the microgels with a core‐shell morphology synthesized from poly(α‐methylstyrene‐b‐methyl methacrylate) on the swelling behavior of the microgel

Saito

Ishizu

Fukutomi

1991

J of Applied Polymer Sci

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“…In the micelle, the core consists of the insoluble block and the hairy shell consists of the soluble block. Chemical cross-linking of the micelle core gives nanoparticles with soluble chain grafting from its surface [14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Characterization of sodium poly(4-styrenesulfonate)-grafted polymer fine particles synthesized by core-cross-linking of block copolymer micelles

Matsumoto

Hasegawa

Matsuoka

2006

Science and Technology of Advanced Materials

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The detailed structure and unique characteristics of a sodium poly(4-styrenesulfonate)-grafted nanoparticle, CCL-SBS 113 -b-SSNa 208 , were investigated, where CCL, SBS, and SSNa represent a core-cross-linked micelle, 4-(1-methylsilacyclobutyl)styrene, and sodium 4-styrenesulfonate, respectively. The particle nanostructure was analyzed by small-angle neutron scattering (SANS), dynamic light scattering (DLS), and atomic force microscopy. SANS data suggested that the particle had a core-corona structure with a 14-nm core radius (R c ) and 2-nm radius of gyration (R g ) corona-forming chain in water. DLS analysis revealed that the hydrodynamic radius (R h ) of particle was 100 nm in water, which is much larger than the whole particle size evaluated by SANS, but the R h value gradually decreased with addition of NaCl and reached a constant value of 61 nm at an NaCl concentration above 0.2 M. Conductometric titration of the acidic form sample with NaOH aq suggested that the CCL-micelle had exactly the same content of sulfonate groups as the precursor block copolymer. The polySSNa-grafting particle showed high solution stability toward salt addition, which may be due to the electrostatic stabilization effect in addition to steric stabilization by the grafting polymer chains. r

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“…By further investigation, the graft copolymerization. [1][2][3][4][5] Each core-shell type super lattice structures could be hierarchically microsphere synthesized by our method was comcontrolled from bcc to fcc via a bcc-fcc mixture posed of a crosslinked core and many shell chains state. [8][9][10] To obtain monodispersed microspheres, with one end attached to the surface of core and all material block copolymers were synthesized by the other end free.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of core-shell type microsphere with reactive seed microspheres

Saito

Ichimura

et al. 1998

J. Appl. Polym. Sci.

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Monodispersed poly(methyl methacrylate) (PMMA) particles (seed microspheres) were synthesized with the living radical initiators, tetramethylthiuram disulfide, or p-xylene dimethyldithiocarbamate by suspension polymerization in water media with and without divinyl benzene as a crosslinker. Monodispersed spherical microspheres with PMMA core-polyacrylamide shells were synthesized by UV irradiation to the seed microsphere-acrylamide aqueous solution. The content and the molecular weight of the polyacrylamide shell chain were controlled by changing the acrylamide feed and irradiation time of the UV light. The microspheres became dispersible to water after the UV irradiation.

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Crosslinking of the inner poly(methyl methacrylate) core of poly(α-methylstyrene-b-methyl methacrylate) micelles in selective solvent: 1. Effect of solvent selectivity

Cited by 40 publications

References 12 publications

Structural effect of the microgels with a core‐shell morphology synthesized from poly(α‐methylstyrene‐b‐methyl methacrylate) on the swelling behavior of the microgel

Structural effect of the microgels with a core‐shell morphology synthesized from poly(α‐methylstyrene‐b‐methyl methacrylate) on the swelling behavior of the microgel

Characterization of sodium poly(4-styrenesulfonate)-grafted polymer fine particles synthesized by core-cross-linking of block copolymer micelles

Synthesis of core-shell type microsphere with reactive seed microspheres

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