Study on the mechanisms of crosslinking of natural polymer by ionizing radiation

• Project/Area Number: 25871093
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Nuclear engineering; Green/Environmental chemistry
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: KIMURA Atsushi 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 量子ビーム応用研究センター, 研究員 (60465979)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: イオン液体 / 天然高分子 / 放射線 / セルロース / キチン / 天然多糖類 / ゲル / 架橋

Outline of Final Research Achievements

Natural polymers have been widely modified by use of chemical treatments such as their derivatives, or by using crosslinking reagents because they have poor solubility in water and organic solvents as well as low chemical reactivity. We produced natural polymer gels without any crosslinking reagent by ionizing radiation from neat cellulose in room temperature ionic liquids (RTILs) under humid conditions for the first time. Reactive species inducing the crosslinking of cellulose in the RTILs and molecular structure of the crosslinking point were investigated by the scavenging method and X-ray photoelectron spectroscopy.The chitin gel was also obtained in the RTILs by ionizing radiation.

Research Products

• [Journal Article] Crosslinking of polysaccharides in room temperature ionic liquids by ionizing radiation (2016)
  • Author(s): Atsushi Kimura, Naotsugu Nagasawa, Akihiko Shimada, Mitsumasa Taguchi
  • Journal Title: Radiation Physics and Chemistry Volume: 印刷中
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Cellulose gels produced in room temperature ionic liquids by ionizing radiation (2014)
  • Author(s): Atsushi Kimura, Nagasawa Naotsugu, Mitsumasa Taguchi
  • Journal Title: Radiation Physics and Chemistry Volume: 103 Pages: 216-221
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] Crosslinking of polysaccharides in room temperature ionic luquids by ionizing radiation (2015)
  • Author(s): Atsushi Kimura, Naotsugu Nagasawa, Akihiko Shimada, Mitsumasa Taguchi
  • Organizer: 13th Tihany symposium on radiation chemistry
  • Place of Presentation: Ramada Aurora Hotel & Resort (Balatonalmad,iHungary）
  • Year and Date: 2015-08-28
  • Int'l Joint Research
• [Presentation] Radiation-induced crosslinking of cellulose in room temperature ionic liquids (2015)
  • Author(s): Atsushi Kimura, Naotsugu Nagasawa, Akihiko Shimada, Mitsumasa Taguchi
  • Organizer: The 15th International Congress of Radiation Research
  • Place of Presentation: Kyoto International Conference Center (Kyoto, Japan)
  • Year and Date: 2015-05-26
  • Int'l Joint Research
• [Presentation] Study on the reaction of polysaccharides in ionic liquid by ionizing radiation (2014)
  • Author(s): Atsushi Kimura, Naotsugu Nagasawa, Mitsumasa Taguchi
  • Organizer: The 5th Asia Pasific Symposium on Radiation Chemistry
  • Place of Presentation: 東京大学 弥生キャンパス 弥生講堂(東京都文京区、日本)
  • Year and Date: 2014-09-08 – 2014-09-09
• [Presentation] イオン液体中の天然多糖類の放射線架橋に関する研究 (2013)
  • Author(s): 木村敦、長澤尚胤、田口光正
  • Organizer: 第５６回放射線化学討論会
  • Place of Presentation: 広島大学学士会館東広島キャンパス（東広島市）
• [Presentation] イオン液体中天然多糖類の放射線照射効果に関する研究
  • Author(s): 木村敦、長澤尚胤、田口光正
  • Organizer: 第１７回弥生研究会
  • Place of Presentation: 東京大学本郷キャンパス（文京区）