Structure and properties of microporous membranes prepared by applying phase separation during polymerization

Mizutani, Yukio; Nishimura, Masakatsu

doi:10.1002/app.1980.070251014

Cited by 11 publications

(3 citation statements)

References 10 publications

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“…The characteristics of membranes used are presented in Table I. Figure 1 The hydration of microporous Neosepta (1) cation-and (2) anion-exchange membranes. The membranes were regenerated with 0.5 M HCl and 0.5M NH,OH, conditioned with 0.5M NaCl, and thoroughly washed with deionized water.…”

Section: Membranesmentioning

confidence: 99%

“…af swollen polymer, ml I g Dependence of(1,2) specific surface of pores and (l', 2') specific volume of membrane on specific volume of swollen polymer in microporous Neosepta ion-exchange membranes. (1, 1') Cation-exchange and (2, 2' ) anion-exchange membranes.where A260 and A280 are the absorbances at 260 and 280 nm, respectively, measured by a diode array spectrophotometer (Hewlett Packard, U.S.A.) .…”

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confidence: 99%

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Morphology of microporous neosepta ion‐exchange membranes and its effect on separation of biological mixtures

Tishchenko

Bleha

Škvor³

et al. 1995

J of Applied Polymer Sci

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SYNOPSISSpecially prepared microporous Neosepta ion-exchange membranes were investigated to establish a correlation between their structural characteristics (pore-size distribution, porosity) and permeability to components of immunoglobulin (Ig) fractions of mouse ascitic fluids. The solutions to be separated contained IgG, with specificity to horseradish peroxidase or to the heavy chain of human IgM, some other proteins, and a large amount of ammonium sulfate (0.22-0.35M). Analysis of the membrane morphology carried out by scanning electron microscopy and mercury porosimetry showed that the membranes possess a polymodal pore-size distribution. There are large open pores (400-600 and 200-300 nm in diameter) on the membrane surfaces, but the void volume of the membranes is a system of connected pores of smaller diameters (from 60-100 to 7-10 nm). The main part of the pores in the membranes displaying the best separation ability was 8-17 nm in diameter. It was found that highly porous charged membranes (relative porosity 58-60%) with low ion-exchange capacity (0.02-0.1 meq/g) made it possible to achieve the desired desalination degree of protein mixture (80-83%) within 5-7 h instead of 5 days needed in the traditional dialysis. Moreover, the amount of separated accompanying proteins reached 25-30% depending on membrane porosity and the quality of specific IgG, was considerably improved. 0 1995 John Wiley & Sons, Inc.

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Section: Membranesmentioning

confidence: 99%

mentioning

confidence: 99%

Morphology of microporous neosepta ion‐exchange membranes and its effect on separation of biological mixtures

Tishchenko

Bleha

Škvor³

et al. 1995

J of Applied Polymer Sci

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“…The measurement was carried out at room temperature by the method shown in the previous paper. 5 The apparatus was similar to that used by KopeEek et a1. 6 It was confirmed beforehand that the water permeation rate linearly increased with the increase in the applied pressure in the range of 0-8 kg/cm2, as reported in the previous paper.5 The water permeability was determined from the slope of the linear relation.…”

Section: Water Permeability Measurementmentioning

confidence: 99%

Preparation of microporous membranes from cation exchange membranes prepared by the paste method

Mizutani

Kusumoto

Nishimura

et al. 1990

J of Applied Polymer Sci

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SynopsisA microporous membrane is prepared by treating the cation exchange membrane (Fe+++ form) with an H,O, aqueous solution. The cation exchange membrane is prepared by the paste method: the base membrane is prepared beforehand and then sulfonated. The preparative conditions of the base membrane were studied in connection with the characteristics of the resultant microporous membrane. Furthermore, the availability of the microporous membrane for ultrafiltration was studied by using an aqueous solution of a bovine hemoglobin.

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Preparation of porous ion‐exchange membranes from sulfonated polyethylene/poly(styrene‐co‐divinylbenzene)

Bryjak

Trochimczuk

1993

Angew. Makromol. Chem.

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It was shown that the etching of styrene-divinylbenzene copolymer from KESD-2 type ion-exchange membranes resulted in porous membranes. Modification of such membranes introduced both acidic or basic groups onto the pore surface. The ultrafiltration of bovine serum albumin through these membranes was mostly affected by coulombic interaction. Protein deposition on/in membrane was controlled by charge as well as hydrophilic properties of membranes. In addition, the effect of polystyrene crosslinking degree on the blend morphology was explained. The structure of polystyrene copolymer underwent the qualitative threshold when the crosslinking agent concentration reached the level of 2 wt.-To. ZUSAMMENFASSUNG:Das Atzen von Styrol-Divinylbenzol-Copolymeren von Ionenaustauschermembranen des Typs KESD-2 fiihrte, wie gezeigt werden konnte, zu porosen Membranen. Durch geeignete Modifizierung konnten sowohl saure als auch basische Gruppen auf die Porenoberflache aufgebracht werden. Die Ultrafiltration von Rinderserumalbumin durch diese Membranen wird hauptsachlich durch Coulomb-Wechselwirkungen beeinflufit. Die Proteinbelegung der Membran wird sowohl durch die Ladungen als auch durch die hydrophilen Eigenschaften der Membranen kontrolliert. Weiterhin wurde der Zusammenhang zwischen dem Vernetzungsgrad von Polystyrol und der Blendmorphologie erklart. Die Struktur des Polystyrol-Copolymeren unterschritt die qualitative Schwelle, sobald die Konzentration des Vernetzers unter 2 Gew.-To sank.

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Structure and properties of microporous membranes prepared by applying phase separation during polymerization

Cited by 11 publications

References 10 publications

Morphology of microporous neosepta ion‐exchange membranes and its effect on separation of biological mixtures

Morphology of microporous neosepta ion‐exchange membranes and its effect on separation of biological mixtures

Preparation of microporous membranes from cation exchange membranes prepared by the paste method

Preparation of porous ion‐exchange membranes from sulfonated polyethylene/poly(styrene‐co‐divinylbenzene)

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