Latex de particules structurees

Daniel, Jean-Claude

doi:10.1002/macp.1985.020101985126

Cited by 52 publications

(21 citation statements)

References 49 publications

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“…For the application of these particles in paints [2], adhesives, or coatings [3], the morphology of the particles is crucial for achieving the desired properties. Figure 1 a gives an overview of different particle morphologies [4][5][6] e. g. coreshell, hemispheres, raspberry-or confetti-like particles obtained by emulsion polymerization. The structure of these particles depends on the choice of the monomers, the synthesis parameters such as temperature, kind of initiator and surfactant, crosslinking density and many more variables [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Characterization of interphases in core—shell latexes by solid-state NMR

Landfester¹,

Spieß

1998

Acta Polym.

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Concepts for the characterization of composite latex particles by advanced solid‐state NMR methods are discussed. The techniques are based on 1H spin‐diffusion experiments usually applied to detect heterogeneities in polymers and polymer blends. In latexes, they allow one to characterize the morphology, including substructures in the interphase between core and shell. Motional heterogeneities within the phases are also detected. The techniques are used to characterize an extended series of core—shell particles composed of poly(n‐butyl acrylate) (PBuA) and poly(methyl methacrylate) (PMMA) synthesized in semicontinuous two‐step emulsion polymerization processes. The influence of process parameters such as synthesis temperature, crosslinking density in the core, shell content, particle size, and annealing are investigated.

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Section: Introductionmentioning

confidence: 99%

Characterization of interphases in core—shell latexes by solid-state NMR

Landfester¹,

Spieß

1998

Acta Polym.

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“…7 In seeded polymerization affinity of the monomers for the latex beads plays a prime role. 8 Although the various steps of these polymerization reactions have not been completely worked out, polymerization does take place around each latex bead whose size increases progressively. 9 As polyacrylamide latex are hydrophilic and polystyrene latex are hydrophobic, two different mechanisms were respectively account for the growth of acrylamide and polystyrene latex.…”

Section: Discussionmentioning

confidence: 99%

“Inverted Microcarriers” for Cell Cultures Made by Polymerization of Shells around Agarose Microspheres in a Non-Cytotoxic Procedure

Cadic

Baquey

Dupuy

1991

Polym J

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ABSTRACT:A new process for microencapsulating cells is described. Cells in solution in agarose were extruded from a syringe into a paraffin oil containing medium. Solid microspheres were produced when the agarose gelled. A rigid interface around each bead was produced by polymerization of a latex seeded solution of a mixture of 5% acrylamide and 0.25% bisacrylamide. Cell viability was demonstrated by radioimmunoassay of prolactin liberated from encapsulated pituitary cells.

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“…[26] These spheres can be prepared from silica (Stöber process) [27] and latices (emulsion polymerization). [28] The real problem is their crystallization. Mesoscopic spheres do not gain as much as atoms do when they crystallize, because the driving forces are weak.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Crystals in Latex Films: Rubbery Opals

Ruhl¹,

Hellmann²

2001

Macromol. Chem. Phys.

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Elastomeric films were prepared, by uniaxial compression, from core‐shell latex particles with a rigid thermoplastic core and a soft elastomeric shell. The films are rubbery, yet well ordered. The latex spheres form a fcc lattice, the 111 plane of which is oriented parallel to the film plane. This colloidal crystallinity is also found in opals. The films are colored due to selective reflection of the light wavelength corresponding to the lattice spacing, but they are not opaque. The crystallization process is surprisingly simple and fast because the core‐shell latex spheres flow in the melt practically like a regular polymer melt. Under uniaxial compression, this flowing melt deposits crystalline layers of the latex spheres along the plates of the press. The order in the films was characterized with transmission electron microscopy and UV spectroscopy. Deformation of the films results in a shift of the reflected light wavelength.

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Latex de particules structurees

Cited by 52 publications

References 49 publications

Characterization of interphases in core—shell latexes by solid-state NMR

Characterization of interphases in core—shell latexes by solid-state NMR

“Inverted Microcarriers” for Cell Cultures Made by Polymerization of Shells around Agarose Microspheres in a Non-Cytotoxic Procedure

Colloidal Crystals in Latex Films: Rubbery Opals

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