YOSHIMIZU Hiroaki

写真a

Affiliation Department etc.

Department of Life Science and Applied Chemistry
Department of Life Science and Applied Chemistry

Title

Associate Professor

Mail Address

E-mail address

Research Fields, Keywords

polymer materials, physical chemstry of polymers, transport properties: diffusion

Graduating School

  • 1982.04
    -
    1986.03

    Tokyo University of Agriculture and Technology   Faculty of Engineering   Graduated

Graduate School

  • 1988.04
    -
    1991.03

    Tokyo Institute of Technology  Graduate School, Division of Science and Engineering  Doctor's Course  Completed

  • 1986.04
    -
    1988.03

    Tokyo University of Agriculture and Technology  Graduate School, Division of Engineering  Master's Course  Completed

Degree

  • Tokyo University of Agriculture and Technology -  Master of Engineering

  • Tokyo Institute of Technology -  Doctor of Engineering

Academic Society Affiliations

  • 2013.10
    -
    Now

    The Membrane Society of Japan

  • 2002.04
    -
    Now

    The Nuclear Magnetic Resonance Siciety of Japan

  • 1992.01
    -
    Now

    The Society of Polymer Science, Japan (SPSJ)

  • 1991.04
    -
    Now

    The Society of Fiber Science and Technology, Japan

Field of expertise (Grants-in-aid for Scientific Research classification)

  • Nanomaterials chemistry

  • Thin film/Surface and interfacial physical properties

  • Polymer/Textile materials

  • Analytical chemistry

  • Structural/Functional materials

 

Research Career

  • Study on Fine Structure and, Gas Sorption, Diffusion and Permeation Propeties of Polymer Membrane by means of NMR Spectroscopy

    Individual   Grant-in-Aid for Scientific Research  

    Project Year:  1996.04  -  Now

  • The High Ordered Polymeric Materials and Separation Properties

    Collaboration in Organization   Grant-in-Aid for Scientific Research  

    Project Year:  1994.04  -  Now

  • A Study of the Structure of Ionomers by Solid-State NMR

    Collaboration in Organization   Grant-in-Aid for Scientific Research  

    Project Year:  1991.04  -  2004.04

  • Structural Analyses of Biopolymers by Solid-state NMR

    Individual   Grant-in-Aid for Scientific Research  

    Project Year:  1986.04  -  1999.03

Papers

  • NMR Spectral Observations of the Gases in Polymer Materials

    Hiroaki YOSHIMIZU

    NMR Spectral Observation of the Gasees of the Gases in Polymer Materials, Experiment al Approaches of NMR Spectroscopy, The NMR Societey of Japan, Ed. ( Springer Nature Singapore Pte Ltd. )    365 - 381   2017  [Refereed]  [Invited]

    Research paper (scientific journal)   Single Author

    The gas transport properties of polymeric materials, including sorption, diffusion, and permeation, are closely related to the structural characteristics of the polymers. As a result, the analysis of polymers exposed to certain gases by NMR spectroscopy can determine detailed correlations between gas sorption and diffusion in the polymer and high-order structurers. One such method involving the analysis of 129Xe NMR chemical shifts is presented herein. This chapter also discusses the estimation of gas diffusion properties from the peak widths in the NMR spectra of polymers, as well as from data generated using pulsed field gradient NMR.

  • Gas Transport Properties of the Crystalline Phase Controlled Its Orientation of Poly(4-methyl-1-pentene)

    Hiroaki YOSHIMIZU, Yuki OKUMURA

    KOBUNSHI RONBUNSHU   71 ( 11 ) 601 - 607   2014.11  [Refereed]  [Invited]

    Research paper (scientific journal)   Multiple Authorship

  • Magnetic Orientation and Gas Diffusion Properties if Layered Structures of Liquid Crystalline Copolyesters with Alkyl Side Chains of Different Length

    Hiroaki YOSHIMIZU, Toshihito KARAKASA

    KOBUNSHI RONBUNSHU   71 ( 7 ) 325 - 333   2014.07  [Refereed]  [Invited]

    Research paper (scientific journal)   Multiple Authorship

  • Temperature dependence of the mean size of polyphenyleneoxide microvoids, as studied by Xe sorption and 129Xe NMR chemical shift analyses

    Hiroaki Yoshimizu, Satoshi Ohta, Tomoko Asano, Tomoyuki Suzuki, Yoshiharu Tsujita

    Polymer Journal   44 ( 8 ) 821 - 826   2012.08  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    129Xe NMR spectra of 129Xe in polyphenyleneoxide, PPO were measured at various temperatures below Tg. From the analysis of 129Xe NMR chemical shifts, the mean volume of individual microvoids in PPO, v could be determined. The temperature when value of v becomes same as a Xe atom, was very close to Tg of PPO. Temperature dependence of individual microvoid’s volume was very similar with that of CH′, which is obtained by dual-mode sorption model from Xe sorption isotherms and is corresponding to the unrelaxed volume of PPO in the glassy state.

  • Characterization of the microvoids of a tetramethyl polycarbonate/polystyrene blend system using Xe sorption measurements and 129Xe NMR spectroscopy

    Hiroaki Yoshimizu, Takafumi Murakami, Tomoyuki Suzuki, Yoshiharu Tsujita

    Polymer Journal   44 ( 8 ) 827 - 831   2012.08  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    Xe sorption properties of tetramethyl bisphenol A polycarbonate (TMPC)/polystyrene (PS) blends indicated the reduction of microvoids by blending. From the analysis of 129Xe NMR chemical shifts of the 129Xe in these blends, the mean volume of individual microvoids (v) was calculated. The v values for these blends were smaller than those of predicted by a simple additive rule, as well as the cases of variation of density and Xe sorption properties. This fact indicates that the volume contraction induced by blending for TMPC/PS blends is mainly attributed to contraction volume of individual microvoids.

  • Characterizations of gas diffusion properties of polyphenyleneoxide in several glassy states by means of NMR spectroscopy

    Hiroaki Yoshimizu, Masahiro Okazawa, Satoshi Jinno, Tomoko Asano, Tomoyuki Suzuki

    Kobunshi Ronbunshu   69 ( 7 ) 424 - 434   2012.07  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Dependence of the Amount of Xe Sorption on the 129Xe NMR Chemical Shift in Glassy Polymers

    Hiroaki YOSHIMIZU

    In NMR Spectroscopy of Polymers: Innovative Strategies for Complex Macromolecules; H. Cheng, et al.; ACS Symposium Series 1077; American Chemical Society: Washington, DC, 2011.   1077   509 - 523   2011.05  [Refereed]

    Research paper (scientific journal)   Single Author

    種々の高分子固体の分子凝集状態をXe-129 NMR法から評価し得ることを解説した.具体的には,Xe-129 NMR化学シフト値から,ガラス状高分子のミクロボイドの平均サイズを推定できる事実とその精度を紹介し,新規な高分子固体の構造解析法として有用であることを主張した.

  • Gas Transport Properties of n-Alkylated Liquid Crystalline Aromatic Polyester Oriented by Magnetic Field

    H. Yoshimizu, S. Ono, M. Mizusaki, T. Karakasa

    Kobunshi Ronbunshu   66 ( 12 ) 605 - 611   2009.12  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Enhancement of Gas Permeability in HPC, CTA, and PMMA under Microwave Irradiation

    Y. Nakai, H. Yoshimizu, Y. Tsujita

    Polymer Journal   38 ( 4 ) 376 - 380   2006.04  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    双極子を有する種々の高分子膜のマイクロ波照射による気体透過性制御を検討したところ,最適な気体分子サイズと試料膜の緻密さとの間に相関関係のあることが明らかとなった.

  • Enhanced gas permeability of cellulose acetate membranes under microwave irradiation

    Y. Nakai, H. Yoshimizu, Y. Tsujita

    Journal of Membrane Science   256 ( 10 ) 72 - 77   2005.10

    Research paper (scientific journal)   Multiple Authorship

    セルロースアセテート膜のマイクロ波照射による気体透過性制御を詳しく検討したところ,気体分子サイズに最適値のあることが明らかとなった.

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Books

  • Organic material analysis by NMR, sample preparation, data interpretation

    Tetsuo Asakura, Yuji Sasanuma, et., al. (Part: Multiple Authorship ,  370-380 )

    Technical information institute co., ltd.  2021.09 ISBN: 4-86104-860-9

    370-380

  • Study examples on IR analyses

    S. Todaka Edt. (Part: Multiple Authorship )

    Technical Information Institute CO., LTD.  2013.10 ISBN: 9784861044946

  • "Fiber" Super Biomimetics

    Tatsuya Hongu, Toshihiro Akaike, Yoshiharu Tsujita, et., al., (Part: Multiple Authorship ,  832-837 )

    NTS  2006.10 ISBN: 4860431324

    832-837

  • Dictionary of Polymers "jointly worked"

    Edited by the Society of Polymer Sience, Japan, H. Yoshimizu (Part: Multiple Authorship )

    Asakura Book  2005.06

  • Solid State NMR of Polymers "jointly worked"

    吉水広明, 朝倉哲郎, 出村誠, 西川直樹、分担執筆者:安藤勲、他39名 (Part: Multiple Authorship ,  pp. 853-890 )

    Elsevier Science B. V.  1998.04

    各種タンパク質、特に繊維状タンパク質のNMRによる固体構造解析について解説した。

  • Structure of Polymer (1) Magnetic Resonance Spectroscopy "jointly worked"

    I. Ando, H. Yoshimizu and 28 members (Part: Multiple Authorship )

    Kyoritsu Press  1995.10

  • Solid State NMR of Polymers "jointly worked"

    I. Ando, H. Kurosu, K. Sato, T. Yamanobe, H. Yoshimizu (Part: Multiple Authorship )

    Koudansha Sientific  1994.03

Review Papers

  • Gas Separation by Polymer Membranes

    YOSHIMIZU Hiroaki

    Kobunshi (High Polymers, Japan) ( The Society of Polymer Science, Japan )  67 ( 7 ) 400 - 401   2018.07  [Invited]

    Introduction and explanation (scientific journal)   Single Author

    There is no strong interaction between polymers and
    gases. Therefore, it can be said that the general princple of gas-separation by polymer membranes is diffusion controlling not affinity tuning. Some unique polymer crystals were useful and had high-potential for gas-separation, because the interchain distances between polymer chains were well-adjusting to the size of gas molecules. In addition, these crystals showed diffusion anisotrpy. The enhancement of gas diffusion and permeation properties was confirmed by mono-axially orienting the crystal with a magnetic field. This method is one of the proposals to obtain a good gas-separation polymer membrane.

  • NMR Characterizations of Polymers Using Gases as Probes

    Hiroaki YOSHIMIZU

    J. Jpn. Soc. Colour Mater. ( Japan Society of Colour Material (JSCM) )  88 ( 8 ) 265 - 270   2015.08  [Refereed]  [Invited]

    Introduction and explanation (scientific journal)   Single Author

    The gas transport properties (gas solubility, diffusivity and permeability) of polymer materials are directly influenced by their structural characteristics. In this article several studies wherein we obtained the NMR spectral data of polymer-gas systems are introduced. Namely, the gas sorption amount can be determined, detailed images of fine higher-ordered structures can be gained through the analysis of Xe-129 NMR chemical shifts, and clarification of the relationship between gas diffusion properties and the higher-ordered structures is possible.

  • Application of NMR Spectroscopy to the Characterization of Gas Separation Membranes

    Hiroaki Yoshimizu

    Sen'i Gakkaishi ( The Society of Fiber Science and Technology, Japan )  68 ( 11 ) P_323 - P_328   2012.12

    Introduction and explanation (international conference proceedings)   Single Author

  • Characterization of higher-odered structures of solid polymers by 129Xe NMR

    Hiroaki YOSHIMIZU

    Chemical Engineering ( Kagaku Kogyosha, Inc. )  56 ( 8 ) 636 - 643   2011.08

    Introduction and explanation (scientific journal)   Single Author

  • Function of Separation by Polymer Gas Separation by Using the Polymer Crystal

    H. Yoshimizu, Y. Tsujita

    Kobunshi (High Polymers, Japan) ( The Society of Polymer Science, Japan )  54 ( 11 ) 827 - 832   2005.11

    Introduction and explanation (international conference proceedings)   Multiple Authorship

  • Characterization of Polymers in the Solid State by 129Xe NMR Spectroscopy

    H. Yoshimizu, T. Suzuki, Y. Tsujita

    Sen'i Gakkaishi ( The Society of Fiber Science and Technology, Japan )  60 ( 10 ) 498 - 503   2004.10

    Introduction and explanation (international conference proceedings)   Multiple Authorship

  • Control of Gas Permeability for Cellulose Membrane by Microwavw Irradiation

    Y. Nakai, Y. Tsujita, H. Yoshimizu, S. Okamoto

    Cellulose Communications ( The Cellulose Society of Japan )  11 ( 2 ) 58 - 62   2004.02

    Introduction and explanation (international conference proceedings)   Multiple Authorship

  • Applications of NMR Spectroscopy to the Structure and Ionic Aggregates of Ionomers

    H.Yoshimizu, Y.Tsujita

    Annual Reports on NMR Spectroscopy ( Academic Press )  44   1 - 22   2001.07

    Introduction and explanation (scientific journal)   Multiple Authorship

    NMR法を用いたアイオノマーの研究例を最新の報告から紹介した.特にエチレンアイオノマーではイオン会合体の存在に加えてエチレンマトリックス相が結晶・非晶の両方を含み,複雑であるが,各種NMR法はこれの構造的知見を詳細に得る一つの有力な手段,との立場で解説した.

  • Gas sorption properties and fine structures of glassy polymers

    Hiroaki Yoshimizu, Yoshiharu Tsujita

    Polymer application ( Kobunshi Knkoukai )  48 ( 12 ) 541 - 547   1999.12

    Introduction and explanation (scientific journal)   Multiple Authorship

  • Gas permeation membranes of polyimides

    Yoshiharu Tsujita, Hiroaki Yoshimizu

    New Materials ( JAPAN INDUSTRIAL PUBLISHING CO., LTD. )  7 ( 5 ) 13 - 17   1996.05

    Introduction and explanation (scientific journal)   Multiple Authorship

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Presentations

  • NMR observations of the gases diffusing in polymer crystals

    Tomohiro Ueji, Hiroaki Yoshimizu

    (Online Virtual Meeting)  2021.12  -  2021.12  The Society of Polymer Science, Japan Research Group on the Interaction between Polymer and Water and Separation Science

  • NMR characterizations of the gas sorption properties in silicon rubber

    Shogo Iwama, Hiroaki Yoshimizu

    (Online Virtual Meeting)  2021.12  -  2021.12  The Society of Polymer Science, Japan Research Group on the Interaction between Polymer and Water and Separation Science

  • NMR observations of the gases in polymers

    Shohei Ariga, Hiroaki Yoshimizu

    (Online Virtual Meeting)  2021.12  -  2021.12  The Society of Polymer Science, Japan Research Group on the Interaction between Polymer and Water and Separation Science

  • The relationships between gas diffusion properties and structural features estimated by NMR spectral analyses of the sorption gases.

    H.Yoshimizu

    Annual Autumn Meeting 2021  (Online Virtual Meeting)  2021.11  -  2021.11  The Society of Fiber Science and Technology, Japan

  • Correlation between polymer structure and function by NMR observation of dissolved gases

    Hiroaki Yoshimizu

    70th Symposium on Macromolecules  (Online Virtual Meeting)  2021.09  -  2021.09  The Society of Polymer Science, Japan

  • Gas diffusion anisotropy of the crystal-oriented polymethyl pentene fiber.

    Ryoto Kiyose, Hiroaki Yoshimizu

    Annual Meeting of The Society of Fiber Science and Technology, Japan 2021  (On line)  2021.06  -  2021.06  The Society of Fiber Science and Technology, Japan

  • Temperature dependences on gas transport properties of crystalline phases of syndiotactic polystyrene.

    Seiya Kohno, Hiroaki Yoshimizu

    Annual Meeting of The Society of Fiber Science and Technology, Japan 2021  (On line)  2021.06  -  2021.06  The Society of Fiber Science and Technology, Japan

  • Observations of plasticization of the glassy polymer by gas sorption using NMR

    H.Yoshimizu

    Annual Autumn Meeting 2020  (Online Virtual Meeting)  2020.11  -  2020.11  The Society of Fiber Science and Technology, Japan

  • Anisotropic gas diffusion properties of the higher ordered structure of magnetic oriented liquid crystalline polyesters

    H.Yoshimizu

    Annual Autumn Meeting 2020  (Online Virtual Meeting)  2020.11  -  2020.11  The Society of Fiber Science and Technology, Japan

  • Analyses of plasticization phenomenon of polymer materials by gas sorption

    Hiroaki Yoshimizu, Hajime Ishitani

    69th Symposium on Macromolecules  (Online Virtual Meeting)  2020.09  -  2020.09  The Society of Polymer Science, Japan

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Industrial Property

  • The Method of Production of Polymeric Materials Containing Well-organized Cavities

    特願 P2002-234432  特開 P2004-75733A  特許 P3989332

    The Method of Production of Polymeric Materials Containing Well-organized Cavities

Academic Awards Received

  • Award of the NAGAI Foundation for Science and Technology

    2001.04    

    Winner: H. Yoshimizu

  • Award for Encouragement of Research in Polymer Science

    1998.04    

    Winner: H. Yoshimizu

Grant-in-Aid for Scientific Research

  • New creation of high-performance gas separation membranes consisting of highly controlled molecular orientation of liquid crystalline polymers

    Grant-in-Aid for Scientific Research(C)

    Project Year: 2012.04  -  2015.03  Investigator(s): Hiroaki YOSHIMIZU

    Magnetically oriented samples of spontaneous form highly ordered molecular aggregation structure of liquid crystalline polymers were prepared. Using the aromatic polyesters having alkyl side chains, the layered or honeycombed structure formed in a superconducting magnet. It was confirmed that the aromatic main chains of these polyesters are oriented parallel to the magnetic field direction. The gas diffusion properties of honeycombed structure was significantly higher than those of layered structure. In addition, gaseous diffusion direction is 90° variation sample was found. These results were, to prove that the creation of new high-performance gas separation membrane with high permeability and separation.

  • An accurate evaluation for free spaces and clarification of gas transport mechanisms of polymer solids with Xe gas and by means of NMR spectroscopy

    Grant-in-Aid for Scientific Research(C)

    Project Year: 2008.04  -  2011.03  Investigator(s): Hiroaki YOSHIMIZU

    The Xe sorption amounts and 129Xe NMR spectra of many polymer solid materials under various pressures of Xe were measured. It was established that the micro pore of 0.1 nm order can be surely estimated by analyses of these observed data, although the electron microscopic observations for the pore were impossible. In addition, it was also demonstrated that the diffusion behaviors of the gases in polymer materials were evaluated in detail by the some new proposed NMR techniques. These outcomes are very important for the development of novel gas separation and barrier polymeric materials.

 
 

Academic Activity

  • 2014.05
     
     

    The Society of Polymer Science, Japan (SPSJ)  

  • 2014.01
    -
    2015.12

    The Nuclear Magnetic Resonance Siciety of Japan  

  • 2013.02
    -
    2013.09

    The Society of Fiber Science and Technology, Japan  

  • 2012.10
    -
    2013.06

    The Society of Fiber Science and Technology, Japan  

  • 2012.09
     
     

    The Society of Polymer Science, Japan (SPSJ)  

  • 2012.04
    -
    2014.03

    The Society of Polymer Science, Japan (SPSJ)   Chairman of Research Group on the Interaction between Polymer and Water and Separation Science

  • 2012.02
    -
    2012.11

    The Nuclear Magnetic Resonance Siciety of Japan  

  • 2012.02
    -
    2012.09

    The Society of Polymer Science, Japan (SPSJ)  

  • 2010.04
    -
    2012.03

    The Society of Polymer Science, Japan (SPSJ)  

  • 2009.06
    -
    2015.06

    The Society of Polymer Science, Japan (SPSJ)  

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