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Review

Recent Progress in Charged Polymer Chains Grafted by Radiation-Induced Graft Polymerization; Adsorption of Proteins and Immobilization of Inorganic Precipitates

1
Department of General Education, Faculty of Medicine, Juntendo University, 1-1 Hirakagakuendai, Inzai, Chiba 270-1695, Japan
2
National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Umezono 1-1-1, Tsukuba, Ibaraki 305-8563, Japan
3
Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
*
Author to whom correspondence should be addressed.
Quantum Beam Sci. 2020, 4(2), 20; https://0-doi-org.brum.beds.ac.uk/10.3390/qubs4020020
Received: 15 March 2020 / Revised: 3 April 2020 / Accepted: 10 April 2020 / Published: 13 April 2020
(This article belongs to the Special Issue Quantum Beams Applying to Innovative Industrial Materials)
Radiation-induced graft polymerization provides industrially superior functionalization schemes by selection of existing polymer substrates and design of graft chains. In this review, by a pre-irradiation method of the radiation-induced graft polymerization and subsequent chemical modifications, charged polymer chains grafted onto various components and shapes of the polymer substrates are described. The charged graft chains immobilized onto a porous hollow-fiber membrane captured proteins in multilayers via multipoint binding. A membrane onto which positively charged graft chains are immobilized, i.e., an anion-exchange porous hollow-fiber membrane, was commercialized in 2011 for the removal of undesirable proteins in the purification of pharmaceuticals. On the other hand, a membrane onto which negatively charged graft chains are immobilized, i.e., a cation-exchange porous hollow-fiber membrane, exhibited a low permeation flux for pure water; however, the prepermeation of an aqueous solution of magnesium chloride through the membrane restored the permeation flux because of ionic crosslinking of graft chains with magnesium ions. The charged graft chains provide a precipitation field for inorganic compounds such as insoluble cobalt ferrocyanide. The graft chains entangle or penetrate a precipitate owing to electrostatic interactions with the surface charge on the precipitate. Braids and wound filters composed of insoluble-cobalt-ferrocyanide-impregnated fibers are used for the removal of radiocesium from contaminated water at Tokyo Electric Power Co. (TEPCO) Fukushima Daiichi Nuclear Power Plant. View Full-Text
Keywords: charged graft chain; radiation-induced graft polymerization; porous hollow-fiber membrane; protein capture; fibrous adsorbent; cesium removal charged graft chain; radiation-induced graft polymerization; porous hollow-fiber membrane; protein capture; fibrous adsorbent; cesium removal
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MDPI and ACS Style

Ishihara, R.; Asai, S.; Saito, K. Recent Progress in Charged Polymer Chains Grafted by Radiation-Induced Graft Polymerization; Adsorption of Proteins and Immobilization of Inorganic Precipitates. Quantum Beam Sci. 2020, 4, 20. https://0-doi-org.brum.beds.ac.uk/10.3390/qubs4020020

AMA Style

Ishihara R, Asai S, Saito K. Recent Progress in Charged Polymer Chains Grafted by Radiation-Induced Graft Polymerization; Adsorption of Proteins and Immobilization of Inorganic Precipitates. Quantum Beam Science. 2020; 4(2):20. https://0-doi-org.brum.beds.ac.uk/10.3390/qubs4020020

Chicago/Turabian Style

Ishihara, Ryo, Shiho Asai, and Kyoichi Saito. 2020. "Recent Progress in Charged Polymer Chains Grafted by Radiation-Induced Graft Polymerization; Adsorption of Proteins and Immobilization of Inorganic Precipitates" Quantum Beam Science 4, no. 2: 20. https://0-doi-org.brum.beds.ac.uk/10.3390/qubs4020020

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