Papers - YOSHIMIZU Hiroaki

Continuous Nanospace in Nanoporous Liquid Crystal Investigated by 129Xe NMR Spectroscopy Reviewed

河野慎一郎(名古屋大学)、吉水広明(名古屋工業大学)、田中健太郎＊(名古屋大学) (＊は、責任著者)

Angewandte Chemie International Edition   63   e202316523 (1 of 5)   2023.11

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/anie.202316523

NMR Spectral Observations of the Gases in Polymer Materials Invited Reviewed International journal

Hiroaki YOSHIMIZU

Experimental Approaches of NMR Spectroscopy Methodology and Application to Life Science and Materials Science   365 - 381   2017.11

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Nature Singapore Pte Ltd.  

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.

DOI： 10.10.1007/978-981-10-5966-7_17

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

Hiroaki YOSHIMIZU, Yuki OKUMURA

KOBUNSHI RONBUNSHU   71 ( 11 )   601 - 607   2014.11

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1295/koron.71.601

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

Hiroaki YOSHIMIZU, Toshihito KARAKASA

KOBUNSHI RONBUNSHU   71 ( 7 )   325 - 333   2014.07

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DOI： 10.1295/koron.71.325

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

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

Polymer Journal   44 ( 8 )   821 - 826   2012.08

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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 C_H′, 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.

DOI： 10.1038/pj.2012.123

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

Hiroaki Yoshimizu, Takafumi Murakami, Tomoyuki Suzuki, Yoshiharu Tsujita

Polymer Journal   44 ( 8 )   827 - 831   2012.08

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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.

DOI： 10.1038/pj.2012.128

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

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

Kobunshi Ronbunshu   69 ( 7 )   424 - 434   2012.07

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DOI： 10.1295/koron.69.424

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

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

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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．

DOI： 10.1021/bk-2011-1077.ch031

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

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

Kobunshi Ronbunshu   66 ( 12 )   605 - 611   2009.12

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DOI： 10.1295/koron.66.605

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

Y. Nakai, H. Yoshimizu, Y. Tsujita

Polymer Journal   38 ( 4 )   376 - 380   2006.04

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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．

DOI： 10.1295/polymj.38.376

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

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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．

DOI： 10.1016/j.memsci.2005.02.008

Study on -form complex in syndiotactic polystyrene-organic molecules systems. IV. Formation of complexes with a mixture of solvents and structural changes during the sorption of solvents by syndiotactic polystyrene mesophase membranes International coauthorship

K.P.O. Mahesh, Y. Tsujita, H. Yoshimizu, S. Okamoto, D.R. Mohan

Journal of Polymer Science, Polymer Physics   43 ( 9 )   2380 - 2387   2005.09

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シンジオタクチックポリスチレンのメゾフェイズ構造から芳香族炭化水素系混合溶媒の収着による再コンプレックス結晶化を検討し，メゾフェイズ相への選択的収着挙動を明らかにした．

DOI： 10.1002/polb.20518

Structure and properties of the -form and mesophase of syndiotactic polystyrene membranes prepared from different organic solvents International coauthorship

M. Sivakumar, K.P.O. Mahesh, Y. Yamamoto, H. Yoshimizu, Y. Tsujita

Journal of Polymer Science, Polymer Physics   43 ( 9 )   1873 - 1880   2005.09

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種々の有機溶媒分子をゲストとするシンジオタクチックポリスチレンのコンプレックス結晶からメゾフェイズ構造を調製し，微細構造の解析を行なった．コンプレックス結晶における分子鎖間距離の若干の違いがメゾフェイズ構造に反映されていることを明らかにした．

DOI： 10.1002/polb.20474

Characterization and transport properties of a novel aliphatic polyamide with an ethyl branch

K. Kanekura, Y. Tsujita, H. Yoshimizu, S. Okamoto, H. Kunisada, M. Goto

Journal of Applied Polymer Science   98 ( 8 )   1955 - 1960   2005.08

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短い分岐構造を持つ新種のポリアミドを調製し，その構造並びに気体輸送特性を検討した．分岐の無い通常のポリアミド(ナイロン)と比べ，密度や溶解性に違いが観察された．

DOI： 10.1002/app.22368

Structure and gas sorption properties of an aromatic polyamide with long alkyl side chains Reviewed

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

Journal of Applied Polymer Science   97 ( 5 )   1771 - 1775   2005.05

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柔軟なアルキル側鎖を有する全芳香族ポリアミドは，主鎖と側鎖が交互に積層した層状構造を形成し，これを条件を選んでイミド化すると，比較的大きな気体収着サイトとしての微小空間，即ちミクロボイドを形成する性質を明らかにした．

DOI： 10.1002/app.21586

Smart membrane: preparation of molecular cavity and preferential sorption of small molecule Invited Reviewed

Y. Tsujita, H. Yoshimizu, S. Okamoto

Journal of molecular structure   739 ( 1-3 )   3 - 12   2005.02

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“分子キャビティー”を制御した高度な分離性能を期待される膜，「スマートメンブレン」の分子設計思想及び，シンジオタクチックポリスチレンなどの実例を紹介した．

DOI： 10.1016/j.molstruc.2004.07.043

Layered structure and Xe sorption and diffusion properties of low-density liquid-crystalline polyester with n-alkyl side chains Reviewed

H. Yoshimizu, M. Tsukahara, T. Suzuki, J. Toida, A. Ando, J. Watanabe, Y. Tsujita

Journal of molecular structure   739   19 - 26   2005.02

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柔軟なアルキル側鎖を有する液晶性全芳香族ポリエステルは，主鎖と側鎖が交互に積層した層状構造を形成する．このポリエステルの構造と気体収着特性の関係を調べた．アルキル側鎖の炭素数に比例して層間隔が広がるが，気体の溶解性と拡散性は層状構造の特徴が反映され，相反関係にあることが分かった．

DOI： 10.1016/j.molstruc.2004.07.044

Structure and properties of the mesophase of syndiotactic polystyrene V: preferential sorption performance of the mesophase for aromatic hydrocarbons Reviewed

Y. Yamamoto, Y. Nakai, T. Katsumata, K. Tsutsui, Y. Tsujita, H. Yoshimizu, S. Okamoto

Journal of molecular structure   739 ( 1-3 )   13 - 17   2005.02

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シンジオタクチックポリスチレンが形成する“分子キャビティー”含有メゾフェイズ構造に対する芳香族炭化水素系混合溶媒の収着現象を検討し，メゾフェイズ相への選択的収着挙動を明らかにした．

DOI： 10.1016/j.molstruc.2004.08.026

Structure and Properties of the Mesophase of Syndiotactic Polystyrene Membrane-VII. Isothermal Sorption Behavior of Xenone Reviewed International journal

M.Sivakumar, T.Suzuki, Y.Yamamoto, K.P.O.Mahesh, H.Yoshimizu, Y.Tsujita

Journal of Membrane Science   238 ( 1-2 )   75 - 81   2004.07

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シンジオタクチックポリスチレンが形成する“分子キャビティー”含有メゾフェイズ構造をXe収着実験および129Xe NMR法から検討した．メゾフェイズ構造含有試料膜におけるXe収着サイトとしてのミクロボイドは量も多くサイズも大きなことが明らかとなり，“分子キャビティー”の存在を再確認できた．

DOI： 10.1016/j.memsci.2004.03.022

Structure and properties of the mesophase of syndiotactic polystyrene. III. Selective sorption of the mesophase of syndiotactic polystyrene Reviewed International journal

S. Mohri, D. Amutharani, Y. Yamamoto, Y. Tsujita, H. Yoshimizu

Journal of Polymer Science, Polymer Physics   42 ( 2 )   238 - 245   2004.02

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シンジオタクチックポリスチレンが形成する“分子キャビティー”含有メゾフェイズ構造の有機蒸気収着現象を検討した．試料膜の非晶相への収着挙動は，溶解型であるのに対し，メゾフェイズ相のそれはラングミュア的であった．また，メゾフェイズの微細構造は，その前駆体であるコンプレックス結晶におけるゲスト分子の形状・サイズに依存して異なるが，メゾフェイズ

DOI： 10.1002/polb.10687