Swelling of latex particles

Morton, Maurice; Kaizerman, S.; Altier, Mary W.

doi:10.1016/0095-8522(54)90040-9

Cited by 356 publications

(167 citation statements)

References 11 publications

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“…(4) - (7)]: of each component between the two phases is based on the Flory-Huggins theory, 19 completed by Morton 20 to take into account the interfacial…”

Section: Theorymentioning

confidence: 99%

Dispersion polymerization of styrene in ethanol-water media: Monomer partitioning behavior and locus of polymerization

Lacroix‐Desmazes

Guillot

1998

J. Polym. Sci. B Polym. Phys.

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“…(4) - (7)]: of each component between the two phases is based on the Flory-Huggins theory, 19 completed by Morton 20 to take into account the interfacial…”

Section: Theorymentioning

confidence: 99%

Dispersion polymerization of styrene in ethanol-water media: Monomer partitioning behavior and locus of polymerization

Lacroix‐Desmazes

Guillot

1998

J. Polym. Sci. B Polym. Phys.

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“…7 When the gel is a microsphere, a curvature effect should be taken into account. 8 It is speculated that larger gel spheres can include a large amount of monomer if the other factors are kept unchanged. The equilibrated amount of monomer absorbed in a series of gel particles, obtained by precipitation polymerization or the following seeded polymerization, was measured by adding a defined amount of monomer to the dispersion of 0.2 g particles in I 00 g water and keeping it at 70°C for I h with gentle stirring.…”

Section: Seeded Polymerization Of Apr In Watermentioning

confidence: 99%

Hydrogel Microspheres I. Preparation of Monodisperse Hydrogel Microspheres of Submicron or Micron Size

Kawaguchi

Kawahara

Yaguchi

et al. 1988

Polym J

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ABSTRACT:Precipitation polymerization of acrylamide derivatives in water resulted in the formation of monodisperse submicron particles. Repetitive seeded polymerizations using the product of precipitation polymerization or precipitation polymerization in ethanol-water media gave larger monodisperse particles. Especially, the latter was very effective for the preparation of micro-size particles.KEY WORDS Hydrogel / Microsphere / Precipitation Polymerization / Seeded Polymerization / Swelling / Hydrogel is a subject of great interest in these days due to its characteristic swellingdeswelling behavior in response to changes of temperature, pH, medium components, etc. and applications based on this character in medical, agricultural, and industrial fields. In many cases, quick and uniform responses are necessary for successful applications. The rate of response is inversely proportional to the square of its size. 1 Therefore, hydrogels are often used in small pieces, fine filaments, or thin films. Small pieces of hydrogels are usually prepared by crashing a bulk of gel or by inverse suspension polymerizations. 2 • 3 The particles given by inverse suspension polymerization have a diameter in the range of IO to 100 µm and not necessarily monodisperse.Recently, smaller and monodisperse microspheres were prepared by a novel precipitation polymerization by Pelton and Chibante. 4 They polymerized N-isopropyl acrylamide with N,N' -methylenebisacrylamide in water at 70°C. As the polymerization temperature was much higher than the lower critical solution temperature (LCST) of resulting polymer, ca. 35°C, the reaction accompanied precipitation of polymers and produced a dispersion of polymer particles with submicron diameter. Some other acrylamide derivatives also give polymers with their specific LCSTs. For example, the polymers of acryloyl pyrrolidine and acryloyl piperidine have their LCSTs at 50°C and 5°C, respectively. We have used such monomers with styrene to prepare latex particles having shells composed of them, which exhibited reversible expansion-shrinkage with changing temperature. 5 • 6 The precipitation polymerization of these acrylamide derivatives was found to result in the formation of monodisperse submicron hydrogel microspheres.The most suitable size of hydrogel microspheres in their applications differs from case to case. Submicron-size might be too small to treat in many cases. The smaller the particles t Present address: Mitsui

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“…Note that the seed was diluted to insure that the surfactant concentration was well below the CMC so as to avoid second-generation particles. The preemulsion was pumped into the reactor over a [12][13][14][15][16][17][18] h period. These were…”

Section: Methodsmentioning

confidence: 99%

Supermicron poly(butyl acrylate)/polystyrene core‐shell latexes

Cook

Rudin

Plumtree

1992

J of Applied Polymer Sci

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SYNOPSISLatex particles of up to 2 pm can be made by standard emulsion polymerization methods, but attempts at larger sizes usually results in a crop of smaller particles or coagulation of the latex. In this work, it is shown that use of an oil-soluble initiator (2,Z' azodiisobutyronitrile [AIBN]) provides a means by which large (6 p m diameter) polybutyl acrylate latex particles can be made by sequential core-shell polymerizations. It is suggested that the limited water solubility of AIBN decreases the formation of secondary particles and that the lower ionic strength of the water phase enhances stability of the latex compared to a conventional persulfate initiator. To further minimize formation of secondary particles, long reaction times and progressively larger proportions of seed latex are used in successive reactions.

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Swelling of latex particles

Cited by 356 publications

References 11 publications

Dispersion polymerization of styrene in ethanol-water media: Monomer partitioning behavior and locus of polymerization

Dispersion polymerization of styrene in ethanol-water media: Monomer partitioning behavior and locus of polymerization

Hydrogel Microspheres I. Preparation of Monodisperse Hydrogel Microspheres of Submicron or Micron Size

Supermicron poly(butyl acrylate)/polystyrene core‐shell latexes

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