Synthesis of novel microfilters with ion-exchange capacity and its application to ultrapure water production systems

Hori, Takayoshi; Hashino, Masatoshi; Omori, Akira; Matsuda, Takato; Takasa, Kenji; Watanabe, Kohei

doi:10.1016/s0376-7388(97)00076-8

Cited by 20 publications

(5 citation statements)

References 2 publications

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“…The properties of a graft chain appended onto a porous trunk polymer by radiation-induced graft polymerization have remained unclear because the isolation of a graft chain from a porous trunk polymer by chemical treatment is difficult and the characterization of a graft chain by instrumental analysis is ineffective. At present, materials functionalized by radiation-induced grafting under reproducible irradiation conditions have a wide range of applications including metal recovery, − ultrapure water production, protein purification, , and enzyme immobilization . However, to precisely design and manufacture sophisticated porous polymeric materials, graft chain characterization is essential.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dose on Mole Percentages of Polymer Brush and Root Grafted onto Porous Polyethylene Sheet by Radiation-Induced Graft Polymerization

Ishihara

Uchiyama

Ikezawa

et al. 2013

Ind. Eng. Chem. Res.

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Glycidyl methacrylate (GMA) was graft-polymerized onto a porous sheet ( 75% porosity and 1.6-μm average pore size) previously irradiated with an electron beam. The resultant grafted poly-GMA chain can be classified as a polymer brush extending from the pore surface toward the pore interior and a polymer root invading the polymer matrix. The boundary crossing the pore/matrix interface can be detected in two independent ways: molar conversion of the epoxy group into a sulfonic group providing a plateau in the molar conversion versus reaction time curve and molar conversion exhibiting a breakthrough point in the swelling ratio versus molar conversion curve. A higher irradiation dose was found to lead to a higher mole percentage of polymer brush in the graft chain. The dose range from 20 to 200 kGy corresponded to the mole percentage range of polymer brush from 6% to 15%.

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Section: Introductionmentioning

confidence: 99%

Effect of Dose on Mole Percentages of Polymer Brush and Root Grafted onto Porous Polyethylene Sheet by Radiation-Induced Graft Polymerization

Ishihara

Uchiyama

Ikezawa

et al. 2013

Ind. Eng. Chem. Res.

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“…Moreover, other vinyl monomers, such as acrylonitrile and styrene as precursors for functionalization can be used for grafting. Functional materials with the polymer brush have been reported for the recovery of polyunsaturated fatty acid (41), collection of uranium from seawater (42), and removal of metal ions from ultrapure water (43).…”

Section: Discussionmentioning

confidence: 99%

Charged polymer brush grafted onto porous hollow-fiber membrane improves separation and reaction in biotechnology

Saito

2002

Separation Science and Technology

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An epoxy-group-containing polymer brush anchored onto the pore surface of a porous hollow-fiber membrane, followed by the introduction of ionizable groups, extends due to mutual electrostatic repulsion, and holds proteins in multilayers. This phenomenon provides novel insight into the static structure and dynamic behavior of the charged polymer brush, and enables highly efficient protein recovery, chiral separation, and enzymatic reaction. Various proteins were recovered using the porous hollow-fiber membranes immobilizing the charged polymer brush at a higher rate and higher capacity compared to bead-packed column because of convection of the protein solution through the pores and multilayering of the proteins in the polymer brush. 535

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“…Sulfonic‐acid (SO 3 H)‐group‐containing hollow‐fiber membranes were prepared by graft polymerization of styrene onto polyethylene porous hollow‐fiber membrane, with subsequent sulfonation of the polystyrene graft chain (18). This hollow‐fiber membrane had inner and outer diameters of 1 and 2 mm, respectively, with an average pore diameter of 0.1 μm and a porosity of 60%.…”

Section: Methodsmentioning

confidence: 99%

Purification of Docosahexaenoic Acid Ethyl Ester Using a Silver-Ion-Immobilized Porous Hollow-Fiber Membrane Module

et al. 2001

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Docosahexaenoic acid ethyl ester (DHA-Et) was purified by adsorption on Ag-ionimmobilized membranes via selective interaction between silver ion and carbon-carbon double bonds of DHA-Et. Silver ions were immobilized onto sulfonic-acid-groupcontaining porous hollow-fiber membranes at an Ag ion density of 1.4 mol/kg of membrane, and 30 membranes were housed in one module (inner diameter ) 18 mm and effective length ) 80 mm). The adsorption isotherms of DHA-Et in various organic solvents revealed that DHA-Et was adsorbed on the immobilized Ag ions with a DHAEt/Ag ion molar binding ratio of 1/5 in methanol, and that acetonitrile was the solvent of choice for the elution of the adsorbed DHA-Et. Permeation of bonito oil ethyl ester solution in methanol through the Ag-ion-immobilized hollow-fiber membrane module demonstrated that the displacement adsorption of other lower unsaturated fatty-acid ethyl esters by DHA-Et proceeded along the membrane thickness. The purity of DHAEt was improved to 99 wt % by permeating first bonito oil ethyl ester containing 95 wt % DHA-Et and then acetonitrile through the module.

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Synthesis of novel microfilters with ion-exchange capacity and its application to ultrapure water production systems

Cited by 20 publications

References 2 publications

Effect of Dose on Mole Percentages of Polymer Brush and Root Grafted onto Porous Polyethylene Sheet by Radiation-Induced Graft Polymerization

Effect of Dose on Mole Percentages of Polymer Brush and Root Grafted onto Porous Polyethylene Sheet by Radiation-Induced Graft Polymerization

Charged polymer brush grafted onto porous hollow-fiber membrane improves separation and reaction in biotechnology

Purification of Docosahexaenoic Acid Ethyl Ester Using a Silver-Ion-Immobilized Porous Hollow-Fiber Membrane Module

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