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Critical behavior and volume phase transition of hydrogels in a micro-space

Research Project

Project/Area Number 25620171
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Polymer/Textile materials
Research InstitutionShinshu University

Principal Investigator

SATO Takaaki  信州大学, 学術研究院繊維学系, 准教授 (20373029)

Co-Investigator(Renkei-kenkyūsha) SUZUKI Daisuke  信州大学, 学術研究院繊維学系, 准教授 (90547019)
Research Collaborator YANASE Keiichi  信州大学, 理工学系研究科
AMANO Kenshi  信州大学, 理工学系研究科
Project Period (FY) 2013-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords温度応答高分子 / ゲル微粒子 / 小角広角X線散乱法 / 相関長 / 臨界現象 / フラクタル / 誘電分光 / 疎水性相互作用 / 感温性高分子 / 小角広角X線散乱 / ポリイソプロピルアクリルアミド / 臨界挙動 / 誘電分散
Outline of Final Research Achievements

This study aimed at establishing a renovated technique for observation and quantitative evaluation of critical phenomena and volume phase transition that thermos-responsive hydrogels exhibit in an extreme micro-space. We targeted better understanding of their critical behavior, involving universality, its breakage, and the underlying molecular mechanisms. We used small- and wide-angle X-ray scattering, dynamic light scattering, and dielectric relaxation spectroscopy. First, we focused on a coil-to-globule transition of poly N-isopropylacrylamide (pNIPAm) in aqueous media, and gained deeper insights into microscopic correlation between the main chains, solvent deuterium isotope effects, and dehydration behavior. Then, we synthesized a series of microgel particles by crosslinking the thermo-responsive polymers. Using the static and dynamic scattering techniques, we succeeded in grasping the gist of their critical behavior, which was quantitatively different from those of bulk gels.

Report

(3 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • Research Products

    (10 results)

All 2014 2013

All Presentation (10 results) (of which Invited: 1 results)

  • [Presentation] 小角散乱法と誘電分光法による感温性高分子水溶液の臨界現象に対する分子論的描像2014

    • Author(s)
      柳瀬慶一, 佐藤高彰
    • Organizer
      第37回溶液化学シンポジウムプレシンポジウム
    • Place of Presentation
      アバンセ、佐賀
    • Year and Date
      2014-11-11
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] Poly(N-isopropylacrylamide)ゲル微粒子の構造揺らぎと特異な臨界挙動:普遍性とその破れ2014

    • Author(s)
      佐藤高彰、蓮岡和幸、鈴木大介
    • Organizer
      第18回高分子ミクロスフェア討論会
    • Place of Presentation
      福井大学
    • Year and Date
      2014-11-05 – 2014-11-07
    • Related Report
      2014 Annual Research Report
  • [Presentation] コイル-グロビュール転移を示す温度応答性高分子の臨界挙動と疎水性相互作用の分子論的メカニズム2014

    • Author(s)
      柳瀬慶一, 宮下拓也, Richard Buchner, 鈴木大介, 佐藤高彰
    • Organizer
      第18回高分子ミクロスフェア討論会
    • Place of Presentation
      福井大学
    • Year and Date
      2014-11-05 – 2014-11-07
    • Related Report
      2014 Annual Research Report
  • [Presentation] Poly(N-isopropylacrylamide) / Poly(N-isopropylmethacrylamide) 共重合体ゲル微粒子分散系が示す臨界挙動の組成依存性2014

    • Author(s)
      天野賢史, 呉羽拓真, 鈴木大介, 佐藤高彰
    • Organizer
      第18回高分子ミクロスフェア討論会
    • Place of Presentation
      福井大学
    • Year and Date
      2014-11-05 – 2014-11-07
    • Related Report
      2014 Annual Research Report
  • [Presentation] Temperature-Induced Structural Modifications and Cooperative Dynamics of Aqueous Poly(N-isopropylacrylamide) Solution2014

    • Author(s)
      Keiichi Yanase, Takuya Miyashita, Daisuke Suzuki, Richard Buchner, and Takaaki Sato
    • Organizer
      The International Symposium on Fiber Science and Technology (ISF2014)
    • Place of Presentation
      Tokyo Big Sight (Japan)
    • Year and Date
      2014-09-28 – 2014-10-01
    • Related Report
      2014 Annual Research Report
  • [Presentation] Static structure of copolymer microgels comprising poly(N-isopropylacrylamide) and poly(N-isopropylmethacrylamide) studied by small and wide-angle X-ray scattering2014

    • Author(s)
      Kenshi Amano, Takuma Kureha, Takuya Miyasita, Daisuke Suzuki, and Takaaki Sato
    • Organizer
      The International Symposium on Fiber Science and Technology (ISF2014)
    • Place of Presentation
      Tokyo Big Sight (Japan)
    • Year and Date
      2014-09-28 – 2014-10-01
    • Related Report
      2014 Annual Research Report
  • [Presentation] Effects of copolymerization on thermo-responsive properties of pNIPAm-based microgels studied by small- and wide-angle X-ray Scattering2014

    • Author(s)
      Kenshi Amano, Takuma Kureha, Daisuke Suzuki, and Takaaki Sato
    • Organizer
      International Meeting on Application of Statistical Mechanics of Molecular Liquid on Soft Matter
    • Place of Presentation
      Bangkok (Thailand)
    • Year and Date
      2014-09-14 – 2014-09-17
    • Related Report
      2014 Annual Research Report
  • [Presentation] Dielectric and Small Angle Scattering Study on Critical Phenomena of Poly(N-isopropyl acrylamide) in Aqueous Media2014

    • Author(s)
      柳瀬慶一, 鈴木大介, Richard Buchner, 佐藤高彰
    • Organizer
      EMLG-JMLG Annual meeting 2014
    • Place of Presentation
      Univ. of Roma TRE (Italia)
    • Year and Date
      2014-09-07 – 2014-09-12
    • Related Report
      2014 Annual Research Report
  • [Presentation] Dielectric and Small Angle Scattering Study on Critical Phenomena of Poly(N-isopropyl acrylamide) in Aqueous Media2014

    • Author(s)
      Takaaki Sato, Keiichi Yanase, Daisuke Suzuki, and Richard Buchner
    • Organizer
      EMLG-JMLG Annual Meeting 2014
    • Place of Presentation
      University Roma (Italia)
    • Related Report
      2013 Research-status Report
  • [Presentation] Temperature-dependent Structure of Aqueous Poly(N-isopropyl acrylamide): Further Microscopic Insights2013

    • Author(s)
      Takaaki Sato, Takuya Miyashita, Ayano Chiba, and Daisuke Suzuki
    • Organizer
      EMLG-JMLG Annual Meeting 2013
    • Place of Presentation
      University of Liile (France)
    • Related Report
      2013 Research-status Report

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Published: 2014-07-25   Modified: 2019-07-29  

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