Core-shell type polymer microspheres prepared from poly(styrene-b-methacrylic acid)—1. Synthesis of microgel

Saito, Reiko; Kotsubo, Hidefumi; Ishizu, Koji

doi:10.1016/0014-3057(91)90093-4

Cited by 30 publications

(11 citation statements)

References 17 publications

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“…With the crosslinking of spherical microdomains of AB diblock copolymer film, core–shell microspheres with hairy shells were synthesized 3. Because the structure of the microphase separation is used as a template for the microsphere, microspheres with narrow size distributions can be obtained if the structure of the microphase separation is homogeneous.…”

Section: Introductionmentioning

confidence: 99%

“…Because the structure of the microphase separation is used as a template for the microsphere, microspheres with narrow size distributions can be obtained if the structure of the microphase separation is homogeneous. On the basis of this concept, we synthesized core–shell microspheres with poly(2‐vinyl pyridine) (PVP) or poly(methacrylic acid) cores and polystyrene (PS) shells with a narrow size distribution 3, 4. From the viewpoint of material design, in comparison with the core–shell microspheres synthesized by emulsion polymerization, the most important feature of these microspheres is that the shell chains are hairy arms.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of microspheres with microphase-separated shells

Saito

Fujita

Ichimura

et al. 2000

J. Polym. Sci. A Polym. Chem.

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Novel structural microspheres of the Janus type, with microphase‐separated polystyrene (PS) and poly(tert‐butyl methacrylate) (PBMA) shells and crosslinked poly(2‐vinyl pyridine) (PVP) cores, were synthesized with the crosslinking of PVP spherical domains in poly(styrene‐block‐2‐vinyl pyridine‐block‐tert‐butyl methacrylate) ABC triblock terpolymer film with PS/PBMA lamellae–PVP spherical structures. For the formation of lamellae‐sphere structures, toluene, which was a selective solvent for the ABC triblock terpolymer, was used. With the crosslinking of PVP spheres in the microphase‐separated film with 1,4‐diiodobutane gas, the microphase structure of the terpolymer was fixed, and microspheres composed of microphase‐separated PS and PBMA shells and P2VP cores were obtained. The size distribution of the purified microspheres was narrow. The characteristics of the microspheres and their aggregation behaviors in selective solvents were investigated by transmission electron microscopy and light scattering methods. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 2091–2097, 2000

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of microspheres with microphase-separated shells

Saito

Fujita

Ichimura

et al. 2000

J. Polym. Sci. A Polym. Chem.

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“…[26] It was found that these microspheres are well-aligned in a hexagonal array in twodimensional aspect, supporting the advent of structural ordering on the crosslinked core-shell polymer microspheres. We also prepared crosslinked polyisoprene (PI) [27] and poly(methacrylic acid) cores [28] /PS shell microspheres using similar crosslinking procedures.…”

Section: Crosslinking Of the Core In Block Copolymer Assembly Filmsmentioning

confidence: 99%

Architecture of Polymeric Superstructures Constructed by Mesoscopically Ordered Cubic Lattices

Ishizu

2003

Macromol. Rapid Commun.

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Highly monodisperse crosslinked core‐shell polymer microspheres could be prepared easily by introducing special crosslinking reagents into the segregated core in block copolymer assembly films. The crosslinked core was stabilized sterically by highly branched shell chains in solution. These microspheres moved like pseudo‐latex. The microspheres formed a lattice with a body‐centered cubic (BCC) structure near the overlap threshold (C*). This structure changed to a face‐centered cubic (FCC) lattice in the bulk region of the films. Photofunctionalized core‐shell microspheres were prepared by introducing dithiocarbamate (DC) groups into shell parts by means of polymer reactions, where DC groups could be propagated using vinyl monomers such as methyl methacrylate (MMA) with living radical mechanism. Polymeric superstructure (three microphase‐separated structure) films were constructed by graft copolymerization of MMA initiated with photofunctionalized microspheres such as macroinitiators under UV irradiation, exhibiting self‐coloring due to Bragg diffraction. These materials can be used for the construction of optical devices such as for the fabrication of light modulators. Photograph of a solution of the microsphere in MMA.magnified imagePhotograph of a solution of the microsphere in MMA.

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“…Polystyrene-block-poly(methacrylic acid) (PS-b-PMA, M n = 34300, PS 199 -PMA 158 , M w /M n = 1.05) was synthesized via living anionic polymerization as described in the Supporting Information (Figure S1). 43 Tetrahydrofuran (THF) and N,N-dimethylformamide (DMF) were purchased from Kanto Chemical (Tokyo, Japan) and used as received. N,N-Dimethylacetamide (DMAc) was also purchased from Kanto Chemical and stirred with calcium hydride for 24 h and then distilled under pressure before use.…”

Section: ■ Introductionmentioning

confidence: 99%

Fabrication of Well-Ordered Mesoporous Polyimide Films by a Soft-Template Method

Komamura

Okuhara

Horiuchi

et al. 2019

ACS Appl. Polym. Mater.

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A well-ordered mesoporous polyimide film was fabricated by a soft-template method using a microphase-separated structure of an amphiphilic block copolymer (BCP) as a template. Poly(amic acid)s (PAAs) as polyimide precursors and resol as a cross-linker for the stabilization of the nanostructure were found to be selectively miscible with the hydrophilic domain of the template BCP. Their mixture coassembled and formed the desired ordered nanostructures. The composite films tended to form well-ordered nanostructures when PAAs with a flexible domain such as ether or methylene were used. Mesoporous polyimide films were obtained on thermal treatment of the composite films formed via the sequential processes of cross-linking of the resol, imidization of the PAAs, and selective decomposition of the template BCPs. A polyimide film with well-ordered hexagonal-packed cylindrical mesopores was successfully fabricated after the thermal treatment of the composite film based on PAA/polystyrene-block-poly(methacrylic acid)/resol. The domain spacing based on small-angle X-ray scattering was 29.4 nm, and the pore diameter was determined by scanning electron microscopy to be ∼19 nm.

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Core-shell type polymer microspheres prepared from poly(styrene-b-methacrylic acid)—1. Synthesis of microgel

Cited by 30 publications

References 17 publications

Synthesis of microspheres with microphase-separated shells

Synthesis of microspheres with microphase-separated shells

Architecture of Polymeric Superstructures Constructed by Mesoscopically Ordered Cubic Lattices

Fabrication of Well-Ordered Mesoporous Polyimide Films by a Soft-Template Method

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