Updated on 2024/07/14

写真a

 
WATANABE, Seigo
 
Affiliation
Faculty of Science and Engineering, Waseda Research Institute for Science and Engineering
Job title
Junior Researcher(Assistant Professor)
Degree
Ph. D. ( 2024.03 Waseda University )

Research Experience

  • 2024.04
    -
    Now

    Waseda University   Research Institute for Science and Engineering   Junior Researcher (Assistant Professor)

  • 2024.04
    -
    2024.06

    Technical University of Munich   Campus Straubing   Visiting Researcher

  • 2022.04
    -
    2024.03

    Japan Society for the Promotion of Science   Research Fellowship for Young Scientists (DC2)

Education Background

  • 2021.04
    -
    2024.03

    Waseda University   Graduate School of Advanced Science and Engineering   Department of Applied Chemistry, Doctoral Course  

  • 2019.04
    -
    2021.03

    Waseda University   Graduate School of Advanced Science and Engineering   Department of Applied Chemistry  

  • 2015.04
    -
    2019.03

    Waseda University   School of Advanced Science and Engineering   Department of Applied Chemistry  

Professional Memberships

  • 2019
    -
    Now

    高分子学会

  • 2018
    -
    Now

    日本化学会

Research Areas

  • Polymer materials / Polymer chemistry

Awards

  • 水野賞

    2024.03   早稲田大学  

  • 帝人賞

    2024.01   TEIJIN MIRAI FORUM 2024  

  • Best Presentation Award

    2023.11   6th G'L'owing Polymer Symposium in KANTO  

  • 第12期アーリーバード 若手研究者奨励賞

    2023.03   早稲田大学理工学術院総合研究所  

  • 第71回高分子学会年次大会 優秀ポスター賞

    2022.06  

  • 関東高分子若手研究会 学生発表会・交流会 2022 優秀口頭発表賞

    2022.03  

  • 第11回CSJ化学フェスタ2021 優秀ポスター発表賞

    2021.12  

  • 第11回CSJ化学フェスタ2021 CSJ化学フェスタ博士オーラル賞

    2021.12  

  • 森村豊明会奨励賞

    2021.03   公益財団法人森村豊明会  

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Media Coverage

  • Great strides in the development of high refractive index polymers for optoelectronics

    Internet

    EurekAlart!  

    https://www.eurekalert.org/news-releases/1042653  

    2024.04

  • 高屈折率・高透過率・高分解性プラ、有機ELの輝度向上に期待

    Internet

    日経クロステック  

    https://xtech.nikkei.com/atcl/nxt/news/24/00645/  

    2024.04

 

Papers

  • Polarizable H‐Bond Concept in Aromatic Poly(thiourea)s: Unprecedented High Refractive Index, Transmittance, and Degradability at Force to Enhance Lighting Efficiency

    Seigo Watanabe, Luca M. Cavinato, Vladimir Calvi, Richard van Rijn, Rubén D. Costa, Kenichi Oyaizu

    Advanced Functional Materials    2024.04  [Refereed]

    Authorship:Lead author

     View Summary

    Abstract

    Developing transparent and highly refractive environmentally friendly polymers has not been realized yet toward sustainable optoelectronics. This work describes poly(thiourea)s (PTUs) design following a new “polarizable group synergy” concept, combining highly polarizable hydrogen bonding groups and aromatic‐based spacers to form densely packed and high‐refractive‐index polymer networks. Specifically, PTUs containing m‐ and p‐phenylene spacers exhibit an easy synthesis, high thermostability (Tg = 159 °C), visible transparency (>92%T at 1 µm‐film), ultra‐high refractive index (nD = 1.81) based on the random H‐bonding arrays with a high packing constant (Kp = 0.738), and straightforward preparation of flexible films via solvent‐based techniques. Capitalizing on these assets, PTU‐films are integrated into benchmark graphene‐based lighting device architectures based on the light‐emitting electrochemical cells (LECs) concept. A joint optical modeling and experimental validation confirm the increase in external quantum efficiency expected by the enhanced light out‐coupling of PTU‐films. Finally, PTUs are efficiently depolymerized to low molecular weight compounds by simply adding diamines under heating, following the dynamic covalent bond exchange between thiourea moieties. Overall, this work highlights the PTU family as new promising materials with a unique polarizable H‐bond design to meet efficient and sustainable thin‐film lighting devices.

    DOI

    Scopus

  • Diverse Side-Chain Transformation of High Refractive Index Methylthio-Substituted Poly(phenylene sulfide)s

    Seigo Watanabe, Yoshino Tsunekawa, Teru Takayama, Kenichi Oyaizu

    Macromolecules   57 ( 6 ) 2897 - 2904  2024.03  [Refereed]

    Authorship:Lead author

    DOI

    Scopus

    1
    Citation
    (Scopus)
  • Designing Strategy for High Refractive Index Polymers: From the Molecular Level to Bulk Structure Control

    Seigo Watanabe, Kenichi Oyaizu

    Bulletin of the Chemical Society of Japan   96 ( 10 ) 1108 - 1128  2023.08  [Refereed]

    Authorship:Lead author

     View Summary

    Abstract

    High refractive index polymers (HRIPs) are essential materials for many optical applications, including organic light-emitting diodes (OLEDs), charge-coupled devices (CCDs), complementary metal oxide semiconductors (CMOS), eyeglasses, and optical waveguides. Various molecular designs, synthetic routes, and material preparation methods have been reported to increase the refractive index (RI) of polymers; however, increasing the RI using only organic (and classical) components is difficult. Other properties, such as low or high Abbe numbers (RI dispersion), low birefringence, and high transparency, are also required for HRIPs depending on the intended wavelength usage, which ranges from visible to infrared (IR) light and X-ray applications. This review summarizes the recent developments in HRIPs, including their synthesis, properties, and applications, and provides future prospects for achieving HRIPs with the desired performances.

    DOI

    Scopus

    5
    Citation
    (Scopus)
  • Supramolecular Cross-Linking of Thiophenylene Polymers via Multiple Hydrogen Bonds toward High Refractive Index

    Seigo Watanabe, Hiromichi Nishio, Teru Takayama, Kenichi Oyaizu

    ACS Applied Polymer Materials   5 ( 4 ) 2307 - 2311  2023.03  [Refereed]

    Authorship:Lead author

    DOI

    Scopus

    10
    Citation
    (Scopus)
  • Facile synthesis of telechelic poly(phenylene sulfide)s by means of electron-deficient aromatic sulfonium electrophiles

    Seigo Watanabe, Hiromichi Nishio, Kenichi Oyaizu

    RSC Advances   13 ( 46 ) 32363 - 32370  2023  [Refereed]

    Authorship:Lead author

     View Summary

    This paper reports a facile synthesis of telechelic poly(phenylene sulfide)s through the Friedel–Crafts type electrophilic substitution of the poly(phenylene sulfide) precursors and the halogenated electron-deficient aromatic sulfonium cation.

    DOI

    Scopus

  • Using GPT-4 in parameter selection of polymer informatics: improving predictive accuracy amidst data scarcity and ‘Ugly Duckling’ dilemma

    Kan Hatakeyama-Sato, Seigo Watanabe, Naoki Yamane, Yasuhiko Igarashi, Kenichi Oyaizu

    Digital Discovery   2 ( 5 ) 1548 - 1557  2023  [Refereed]

     View Summary

    Data scarcity in materials informatics hinders structure–property relationships. Using GPT-4 can address challenges, improving predictions like polymer refractive indices.

    DOI

    Scopus

    1
    Citation
    (Scopus)
  • Transcending the Trade-off in Refractive Index and Abbe Number for Highly Refractive Polymers: Synergistic Effect of Polarizable Skeletons and Robust Hydrogen Bonds

    Seigo Watanabe, Teru Takayama, Kenichi Oyaizu

    ACS Polymers Au   2 ( 6 ) 458 - 466  2022.08  [Refereed]

    Authorship:Lead author

    DOI

  • Designing Ultrahigh-Refractive-Index Amorphous Poly(phenylene sulfide)s Based on Dense Intermolecular Hydrogen-Bond Networks

    Seigo Watanabe, Kenichi Oyaizu

    Macromolecules   55 ( 6 ) 2252 - 2259  2022.03  [Refereed]

    Authorship:Lead author

    DOI

    Scopus

    14
    Citation
    (Scopus)
  • Synthesis of colorless and high-refractive-index sulfoxide-containing polymers by the oxidation of poly(phenylene sulfide) derivatives

    Seigo Watanabe, Teru Takayama, Hiromichi Nishio, Kanta Matsushima, Yoko Tanaka, Seiya Saito, Yushun Sun, Kenichi Oyaizu

    Polymer Chemistry   13 ( 12 ) 1705 - 1711  2022  [Refereed]

    Authorship:Lead author

    DOI

  • Synthesis of methylated phenylene sulfide polymers via bulk oxidative polymerization and their heat curing triggered by dynamic disulfide exchange

    Seigo Watanabe, Seiya Saito, Motoyasu Hirai, Kenichi Oyaizu

    Polymer Journal    2022.01  [Refereed]

    Authorship:Lead author

    DOI

    Scopus

    1
    Citation
    (Scopus)
  • Catechol End-Capped Poly(arylene sulfide) as a High-Refractive-Index “TiO2/ZrO2-Nanodispersible” Polymer

    Seigo Watanabe, Kenichi Oyaizu

    ACS Applied Polymer Materials    2021.09  [Refereed]

    Authorship:Lead author

    DOI

    Scopus

    12
    Citation
    (Scopus)
  • Methoxy-Substituted Phenylenesulfide Polymer with Excellent Dispersivity of TiO2 Nanoparticles for Optical Application

    Seigo Watanabe, Kenichi Oyaizu

    Bulletin of the Chemical Society of Japan   93 ( 11 ) 1287 - 1292  2020.11  [Refereed]

    Authorship:Lead author

    DOI

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Presentations

  • Design of Highly Refractive Polymer for Optoelectronics

    Seigo Watanabe

    Applied Advancement of Renewable Materials for Advanced Applications 

    Presentation date: 2024.04

  • Hydrogen Bonds with Sulfur: A Rational High Refractive Index Polymer Design

    Seigo Watanabe, Kenichi Oyaizu

    2024 Peking-Waseda TGU Joint Symposium 

    Presentation date: 2024.02

  • 多点水素結合を利用した超高屈折率ポリマーの創出

    渡辺清瑚, 小柳津研一

    TEIJIN MIRAI FORUM 2024 

    Presentation date: 2024.01

  • High Refractive Index Aromatic Poly(thiourea)s Bearing Polarizable Hydrogen Bonds

    Seigo Watanabe, Kenichi Oyaizu

    6th G'L'owing Polymer Symposium in KANTO 

    Presentation date: 2023.11

  • 水素結合ネットワークと分極性官能基を併せ持つ超高屈折率ポリチオウレア

    渡辺清瑚, 小柳津研一

    第72回高分子討論会 

    Presentation date: 2023.09

  • Thiourea-Based High Refractive Index Polymers with Efficient Degradability

    Seigo Watanabe, Kenichi Oyaizu

    12th Jilin-Korea-Waseda Alliance Annual Symposium 

    Presentation date: 2023.08

  • Ultrahighly Refractive and Degradable Thiourea Polymers with Dense and Multiple Intermolecular Hydrogen Bonds

    Seigo Watanabe, Kenichi Oyaizu

    Presentation date: 2023.03

  • Thiourea-Incorporated Ultrahigh-Refractive-Index Polymers Based on Random yet Dense Hydrogen Bonding Networks

    Seigo Watanabe, Kenichi Oyaizu

    The 17th Pacific Polymer Conference (PPC17) 

    Presentation date: 2022.12

  • 側鎖に硫黄含有基と水酸基を併せ持つポリ(フェニレンスルフィド)誘導体の合成と特異な屈折率特性

    渡辺清瑚, 西尾博道, 小柳津研一  [Invited]

    第71回ポリマー材料フォーラム 

    Presentation date: 2022.11

  • ランダムな水素結合ネットワーク形成を基軸とした超⾼屈折率ポリ(チオウレア)の合成と性質

    渡辺清瑚, 小柳津研一

    第15回超分子若手懇親会 

    Presentation date: 2022.11

  • チオウレア基の無秩序な多点水素結合形成を駆動力とした超高屈折率ポリマーの創製

    渡辺清瑚, 小柳津研一

    第71回高分子討論会 

    Presentation date: 2022.09

  • 側鎖に硫黄含有基と水酸基を併せ持つポリ(フェニレンスルフィド)誘導体の合成と特異な屈折率特性

    渡辺清瑚, 西尾博道, 小柳津研一

    第71回高分子学会年次大会 

    Presentation date: 2022.05

  • 分極率と分子間相互作用の統合的制御による超高屈折率ポリ(フェニレンスルフィド)の合成

    渡辺清瑚, 高山央, 西尾博道, 小柳津研一

    関東高分子若手研究会 学生発表会・交流会 2022 

    Presentation date: 2022.03

  • Synthesis of Functionalized Poly(phenylene sulfide)s via Oxidative Polymerization and Their Ultrahigh Refractive Indices Driven by Hydrogen Bonds

    Seigo Watanabe, Hiromichi Nishio, Kenichi Oyaizu

    The International Chemical Congress of Pacific Basin Societies 2021 

    Presentation date: 2021.12

  • 水素結合ネットワークを導入した含硫黄超高屈折率ポリマー

    渡辺清瑚, 高山央, 小柳津研一

    第14回超分子若手懇親会 

    Presentation date: 2021.11

  • フェノール性水酸基の導入によるポリ(フェニレンスルフィド)の高屈折率・高アッベ数化と光学機能付与

    渡辺清瑚, 小柳津研一

    第11回CSJ化学フェスタ2021 

    Presentation date: 2021.10

  • 熱硬化性を示すポリ(フェニレンスルフィド)誘導体の合成とナイロン6との部分相溶ポリマーブレンド

    渡辺清瑚, 高山央, 三浦智弘, 小柳津研一

    第70回高分子討論会 

    Presentation date: 2021.09

  • Hydroxy-Bearing Poly(phenylene sulfide): A Colorless and Transparent Polymer with Unprecedented Ultrahigh Refractive Index

    Seigo Watanabe, Kenichi Oyaizu

    10th Jilin-Korea-Waseda Alliance Annual Symposium 

    Presentation date: 2021.09

  • Synthesis and Optical Properties of Ultrahigh Refractive Index Poly(phenylene sulfide)s via Oxidative Polymerization

    Seigo Watanabe, Hiromichi Nishio, Kenichi Oyaizu

    第70回高分子学会年次大会 

    Presentation date: 2021.05

  • 超高屈折率を示す非晶性ポリ(フェニレンスルフィド)誘導体の合成とその性質

    渡辺清瑚, 小柳津研一

    2020年度関東高分子若手研究会 学生発表会 

    Presentation date: 2021.02

  • High Refractive Index Poly(arylene sulfide)s with Functional Groups for Finely Compatibilized Hybrid Materials

    Seigo Watanabe, Teru Takayama, Kenichi Oyaizu

    3rd G'L'owing Polymer Symposium in KANTO 

    Presentation date: 2020.11

  • ナノコンポジット化を志向した熱硬化性ポリフェニレンスルフィド誘導体の合成とその性質

    渡辺清瑚, 髙山央, 小柳津研一

    第10回CSJ化学フェスタ2020 

    Presentation date: 2020.10

  • Synthesis of Poly(phenylene sulfide) Derivatives with High Dispersivity of TiO2 Nanoparticles and Their Application to High Refractive Index Hybrid Materials

    Seigo Watanabe, Kenichi Oyaizu

    第69回高分子討論会 

    Presentation date: 2020.09

  • 酸化重合によるメトキシ基置換ポリ(フェニレンスルフィド)の合成と有機-無機ハイブリッド材料への応用

    渡辺清瑚, 平井元康, 小柳津研一

    第9回CSJ化学フェスタ2019 

    Presentation date: 2019.10

  • 酸化重合によるメトキシ基置換ポリ(フェニレンスルフィド)の合成とその性質

    渡辺清瑚, 平井元康, 小柳津研一

    第68回高分子討論会 

    Presentation date: 2019.09

  • ジアリールジスルフィドの酸化重合によるメチル基置換ポリ(フェニレンスルフィド)および共重合体の合成とその性質

    渡辺清瑚, 平井元康, 小柳津研一

    日本化学会第99回春季年会 

    Presentation date: 2019.03

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Research Projects

  • Development of Sulfur-Containing Ultrahigh-Refractive-Index Polymers through Controlling Intermolecular Interactions

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows

    Project Year :

    2022.04
    -
    2024.03
     

  • 高密度な分子間相互作用を鍵とする高屈折・低誘電アモルファスポリマー

    みずほ学術振興財団 第66回工学研究助成

    Project Year :

    2023.04
    -
    2024.03
     

  • 高分極性原子団を無秩序かつ密に集積した超高屈折率ポリマーの創製

    早稲田大学 理工学総合研究所 アーリーバード

    Project Year :

    2022.06
    -
    2023.03
     

Misc

  • Using GPT-4 in Parameter Selection of Materials Informatics: Improving Predictive Accuracy Amidst Data Scarcity and 'Ugly Duckling' Dilemma

    Kan Hatakeyama-Sato, Seigo Watanabe, Naoki Yamane, Yasuhiko Igarashi, Kenichi Oyaizu

    ChemRxiv    2023.05

    DOI