Details of a Researcher - WATANABE, Seigo

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WATANABE, Seigo

Scopus Paper Info

Paper Count: 12 Citation Count: 86 h-index: 6

Click to view the Scopus page. The data was downloaded from Scopus API in November 21, 2024, via http://api.elsevier.com and http://www.scopus.com .

Google Scholar Information (Citations per year)

Citation Count: 114 h-index: 8 i10-index: 7

Click to view the Google Scholar page.

Scopus Information

News & Topics

2024.05.01

Great Strides in the Development of High Refractive Index Polymers for Optoelectronics

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 )

Mail Address

Homepage URL

https://sites.google.com/view/seigowatanabe/

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 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

里見賞 (優秀賞)

2024.10 公益財団法人里見奨学会
ナノテクノロジーフォーラム賞

2024.10 早稲田大学ナノライフ創新研究機構
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

▼display all

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

Aromatic Poly(dithioacetal)s: Spanning Degradability, Thermostability, and High Refractive Index Towards Eco‐friendly Optics

Seigo Watanabe, Tomoya Yano, Zexin An, Kenichi Oyaizu

ChemSusChem 2024.09 [Refereed]

Authorship：Lead author

　View Summary

In the quest for eco‐friendly optics, high refractive index polymers (HRIPs) with degradability have been one of the desirable optical materials for realizing eco‐friendly and efficient lighting technologies. However, it has been challenging for HRIPs to simultaneously realize thermostability, high refractive index (RI), visible transparency, and efficient degradability, all of which are essential for their practical use. In this context, we herein focus on aromatic poly(dithioacetal)s, composed of visible‐transparent yet degradable dithioacetal moieties and rigid diphenyl disulfide spacers, exhibiting moderately high Tg (> 60 °C), high RI (> 1.7), and colorless film features. In addition, poly(dithioacetal)s can balance (1) high stability under the operating conditions even upon heating and (2) quantitative degradability that can selectively yield cyclic low‐molecular‐weight products that can be further repolymerized upon further addition of an acid catalyst. These results provide a key concept for high refractive index polymers that allow on‐demand degradability and recyclability without compromising their high potential thermal and optical properties.

DOI

Scopus
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 (T_g = 159 °C), visible transparency (>92%T at 1 µm‐film), ultra‐high refractive index (n_D = 1.81) based on the random H‐bonding arrays with a high packing constant (K_p = 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

3

Citation

(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

3

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

10

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

12

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

3

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

19

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

15

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

低誘電損失を示すポリ(フェニレンスルフィド)誘導体の設計戦略

渡辺清瑚, 三浦嵩真, 中村勇渡, 吉田有希, 小柳津研一

第73回高分子討論会

Presentation date： 2024.09
Ultrahigh Refractive Index Poly(thiourea)s: Synthesis, Properties, and Their Implementation for Light-emitting Devices

Seigo Watanabe, Kenichi Oyaizu

Polycondensation 2024

Presentation date： 2024.09
Sulfur Meets Interplay: Promising Pathway toward High Refractive Index and Low Dielectric Loss Polymers

Seigo Watanabe [Invited]

13th Jilin-Korea-Waseda Alliance Symposium

Presentation date： 2024.08
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

ヘテロ元素を置換した高屈折率ポリフェニレンスルフィドの合成と高分子反応による光学機能制御

公益財団法人里見奨学会研究提案表彰

Project Year :

2024.10

-

2026.03
高屈折率とリサイクル性を両立する循環型光学プラスチックの創出

早稲田大学ナノライフ創新研究機構ナノテクノロジーフォーラム賞研究助成

Project Year :

2024.10

-

2025.03
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