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OKUBO, Masayoshi; MIYANAGA, Masataka; Nakamura, Yoshinobu; Matsumoto, Tsunetaka

doi:10.1295/koron.40.707

Cited by 11 publications

(4 citation statements)

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“…We call such a procedure "MEK -alkali treatment" . 20 The emulsion was subjected to centrifugation-washing-centrifugation procedure and the precipitate was dried to give Microsphere B. Microsphere C: to the emulsion were added MEK (8 g) and Glc solution (2.0X10-1 mol dm 3, 16 g). The pH was adjusted to 10 and the mixture was treated similarly to Microsphere B.…”

Section: Preparation Of Microspheresmentioning

confidence: 99%

Preparation and Characterization of Polymer Microspheres Which Haye Specific Binding Ability for Saccharide Molecules

et al. 1996

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Section: Preparation Of Microspheresmentioning

confidence: 99%

Preparation and Characterization of Polymer Microspheres Which Haye Specific Binding Ability for Saccharide Molecules

et al. 1996

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“…Nonionic emulsifiers have been widely used in emulsion polymerization. We have carried out a series of investigations on the redistribution of carboxyl groups within carboxylated polymer particles stabilized with nonionic emulsifiers [4][5][6][7][8]. Throughout the studies it was found that multihollow polymer particles could be prepared by two-step post-treatment of styrene-butyl acrylate-methacrylic acid terpolymer particles with alkali and acid.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of nonionic emulsifier inside methacrylic polymer particles in emulsion polymerization

2006

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The incorporations of polyoxyethylene lauryl ether (Emulgen 109P) and polyoxyethylene nonyl phenyl ether (Emulgen 911) nonionic emulsifiers inside poly(methyl methacrylate) (PMMA), poly(ethyl methacrylate) (PEMA) and poly(iso-butyl methacrylate) (Pi-BMA) particles, prepared by emulsifier-present emulsion polymerizations were examined. In order to measure the amounts of the incorporated nonionic emulsifiers, optimum compositions of 2-propanol aqueous solutions to remove the nonionic emulsifier from the particle surfaces without removal from the insides were determined. The amount of the incorporation measured by gel permeation chromatography was increased in order of PMMA >PEMA > Pi-BMA, which accorded with the order of miscibility between each polymer and the emulsifier.

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“…The glass transition temperature (Tg) of the S-BA-MAA terpolymer measured by differential scanning calorimetry was 74 ~ In the previous articles [12,13], we have pointed out that mobility of polymer segments in particles was a significant factor for localization of carboxyl groups at the surface by the alkalitreatment. From this point of view, it seems that the effects of alkali-and acid-treatments on the variations of As values are related to the Tg of the base terpolymer.…”

Section: Resultsmentioning

confidence: 99%

“…The first trial was a direct alkali hydrolysis of the ester group at the surface of poly(ethyl acrylate) emulsion particles [11]. The second was localization of carboxyl groups from the inside to the surface of carboxylated polymer partides [12], which was induced by following treatments. First of all, carboxyl groups in styrene(S)-MAA copolymer emulsion were neutralized with alkali and then organic solvent, e.g.…”

Section: Introductionmentioning

confidence: 99%

Localization of carboxyl groups at surface layer of carboxylated polymer emulsion particles by alkali treatment

Okubo

Kanaida

et al. 1987

Colloid & Polymer Sci

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For the purpose of localizing carboxyl groups from inside to particle surface, styrene -butyl acrylate -methacrylic acid (74.3/17.0/8.7, mol ratio) terpolymer emulsion was kept under pH 9 at different temperatures. The amount of carboxyl groups at the particle surface, As, was remarkably increased by the alkali-treatment above 35 ~ On the other hand, As value of the alkalitreated emulsion was decreased by keeping under ph 3 above 45 ~ C, although in the case of the original emulsion without the alkalitreatment, it was not changed by the acid-treatment. These results suggest that a part of polymer segments which have ionized carboxyl groups is dragged out at the surface by an increase in the affinity of the groups against water, and the dragged segments turn back into the inside again when the carboxyl groups are deionized.

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Cited by 11 publications

References 0 publications

Preparation and Characterization of Polymer Microspheres Which Haye Specific Binding Ability for Saccharide Molecules

Preparation and Characterization of Polymer Microspheres Which Haye Specific Binding Ability for Saccharide Molecules

Incorporation of nonionic emulsifier inside methacrylic polymer particles in emulsion polymerization

Localization of carboxyl groups at surface layer of carboxylated polymer emulsion particles by alkali treatment

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