Tokushima University / Educator and Researcher Directory --- Kawatani, Ryo

Personal Web Page

https://researchmap.jp/ryo_kawatani (researchmap)

https://orcid.org/0000-0003-1449-3347 (ORCID)

Field of Study

○	Nanotechnology/Materials [Polymer chemistry]

Subject of Study

Book / Paper

(See https://researchmap.jp/ryo_kawatani (researchmap) for Published Book / Papers / Presentations.)

Book:

1.	Ryo Kawatani, 高坂泰弘, 他 29名 and 監修松本章一 : 接着と剥離のための高分子設計とその応用, CMC Publishing Co.,Ltd., 2023.
2.	Ryo Kawatani, 網代広治, 他 156名 and 監修宮田隆志 : Stimuli-Responsive Polymers Handbook, CMC Publishing Co.,Ltd., 2018.

Academic Paper (Judged Full Paper):

1.	Yuta Tsukaguchi, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : Predicting molecular weight of end-capped polystyrenes via multivariate analysis of 1H NMR spectra, Polymer, 365, 10, 130706, 2026. (Tokushima University Institutional Repository) ● Metadata: 2014901 (Link to Publication Site) ● Publication site (DOI): 10.1016/j.polymer.2026.130706 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-105047796000 (Tokushima University Institutional Repository: 2014901, DOI: 10.1016/j.polymer.2026.130706, Elsevier: Scopus)
2.	Tomohiro Hirano, Reina Tamakoshi, Yoshiro Ishikawa, Hitoshi Nishimura, Ryo Kawatani, Kohei Torii, Ken Yoshida and Hitoshi Mizuguchi : Chemical structure analysis of a polystyrene gel cross-linked by diacrylate via postpolymerization reaction and multivariate analysis of NMR spectra of the primary chain, Polymer, 358, 130166, 2026. (Summary) Gels are generally insoluble in solvents, making it difficult to elucidate key structural parameters, such as cross- linking efficiency and the degree of polymerization between cross-linking points. Even when cross-linking points can be selectively cleaved to convert a gel into primary polymer chains thereby enabling structural analysis of the cross-linking sites it remains challenging to obtain detailed information on chemical structures, including monomer sequence distribution. In this study, the cross-linking points of a styrene (St) gel cross-linked with a diacrylate were selectively cleaved via transesterification with methanol, converting the gel into a soluble styrene/methyl acrylate (St/MA) copolymer. The monomer sequence distribution of the resulting primary polymer chains was estimated by multivariate analysis of 1H NMR spectra, using separately synthesized St/MA copolymers as training data. Through this indirect approach, the chemical structures of the original gel were successfully analyzed. This strategy offers a practical route to elucidating the chemical structures of otherwise inaccessible insoluble gels. (Tokushima University Institutional Repository) ● Metadata: 2014913 (Link to Publication Site) ● Publication site (DOI): 10.1016/j.polymer.2026.130166 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.polymer.2026.130166 (Tokushima University Institutional Repository: 2014913, DOI: 10.1016/j.polymer.2026.130166)
3.	Tomohiro Hirano, Yusuke Horita, Jui-Ting Sun, Ryo Kawatani and Ken Yoshida : Temperature-responsive phase-transition behavior characterized by a gradual increase in transition temperature accompanied by inverse hysteresis in aqueous solutions of poly(N-acryloylglycine methyl ester), Polymer, 356, 130079, 2026. (Summary) Poly(N-acryloylglycine methyl ester) [poly(NAcGlyMe)], bearing both amide and ester carbonyl groups in each side chain, was designed to enhance the hydrogen bonding between adjacent side chains, leading to an anomalous hysteresis phenomenon. An atactic polymer was prepared, as a reference for stereoregularity effects, via photo-iniferter reversible addition-fragmentation chain transfer polymerization in methanol at 60 °C. The lower critical solution temperature (LCST) type phase transition behavior of its aqueous solution was investigated by monitoring the transmittance at 500 nm. Contrary to conventional LCST behavior, the polymer exhibited a remarkably rare phase transition, namely inverse hysteresis, in which the phase transition temperature during cooling (80.2 °C) was higher than that during heating (77.8 °C). Moreover, the transition temperature increased irreversibly upon repeated heating cooling cycles, and by the fifth cycle, no distinct decrease in transmittance was observed. Notably, an amide proton signal was detected in the 1H nuclear magnetic resonance (NMR) spectrum of the polymer recovered after the sixth heating cooling cycle, although it is typically undetectable in D2O due to H/D exchange. Dynamic light scattering (DLS) measurements revealed the presence of associated species even below the phase transition temperature, and their fraction increased with increasing temperature. Furthermore, stereoregularity significantly affected the phase transition behavior: a heterotactic-rich polymer exhibited inverse hysteresis similar to the atactic polymer, whereas an isotactic-rich polymer showed no LCST type phase transition. These findings suggest that hydrogen bonding between adjacent side chains, enhanced by ester carbonyl group, is responsible for the anomalous phase transition behavior of poly(NAcGlyMe). (Tokushima University Institutional Repository) ● Metadata: 2014912 (Link to Publication Site) ● Publication site (DOI): 10.1016/j.polymer.2026.130079 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.polymer.2026.130079 (Tokushima University Institutional Repository: 2014912, DOI: 10.1016/j.polymer.2026.130079)
4.	Tomohiro Hirano, Reina Tamakoshi, Yuzuki Kobayashi, Tamaki Nakano, Ryo Kawatani, Kohei Torii, Ken Yoshida and Hitoshi Mizuguchi : Statistical prediction of chemical composition and monomer sequences in methyl acrylate ethyl acrylate copolymers by multivariate analysis of NMR spectra, Polymer, 343, 129388, 2026. (Summary) Quantitative characterization of copolymer microstructures, including chemical composition and monomer sequences, is essential because these primary structures strongly influence material properties. In this study, we applied multivariate analysis to NMR spectra of methyl acrylate (MA) ethyl acrylate (EA) copolymers to predict their chemical composition and monomer sequences. By applying partial least squares (PLS) regression, the MA composition was successfully predicted from 13C NMR spectra. 1H NMR spectra also provided satisfactory predictions, but 13C NMR spectra yielded more accurate results, likely because the chemical shifts of the 13C signals of the individual monomeric units were more distinct, despite spectral overlap creating an apparently featureless line shape. Monomer sequences, particularly the hetero-diad sequence, were difficult to predict using 1H NMR spectra, whereas the use of 13C NMR spectra markedly improved the prediction accuracy owing to their wider chemical shift range. This level of primary structural detail in acrylate copolymers cannot be achieved using conventional NMR analysis that relies on peak assignment and integration. These findings demonstrate that NMR spectroscopy combined with statistical multivariate analysis offers a powerful approach for determining the primary structures of acrylate copolymers. (Tokushima University Institutional Repository) ● Metadata: 2013967 (Link to Publication Site) ● Publication site (DOI): 10.1016/j.polymer.2025.129388 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.polymer.2025.129388 (Tokushima University Institutional Repository: 2013967, DOI: 10.1016/j.polymer.2025.129388)
5.	Tomohiro Hirano, Yuto Takahashi and Ryo Kawatani : Syndiotactic-specific radical polymerization of N-isopropylacrylamide complexed with carboxylic acids by hydrogen bonds, Polymer, 337, 129010, 2025. (Summary) Although highly isotactic polymers can be prepared through the radical polymerization of N-isopropylacrylamide (NIPAAm), achieving stereocontrol remains challenging. In particular, the synthesis of syndiotactic poly(NIPAAm)s rich in r diads, which consist of monomeric units oriented in opposition, is difficult. To investigate the stereocontrol in radical polymerization by hydrogen bonding interactions, the radical polymerization of NIPAAm was carried out in toluene at low temperatures in the presence of carboxylic acids, such as benzoic acid (BA) derivatives. The 1H NMR spectra of the obtained polymers revealed that the addition of BA derivatives increased the r diad content greater than 60%. This indicates that the carboxylic acid plays an important role in inducing syndiotactic-specificity in the NIPAAm polymerization. Introducing two CH3 groups at the 2- and 6-positions and one CF3 group at the 2-position of BA increased the r diad content to 70.6% and 70.7%, respectively. NMR analysis of the mixtures of NIPAAm and BA revealed a 2:1 complex formation through two types of hydrogen bonds. Therefore, a plausible mechanism for the syndiotactic-specific polymerization of the complexed monomers was proposed. (Tokushima University Institutional Repository) ● Metadata: 2013488 (Link to Publication Site) ● Publication site (DOI): 10.1016/j.polymer.2025.129010 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.polymer.2025.129010 (Tokushima University Institutional Repository: 2013488, DOI: 10.1016/j.polymer.2025.129010)
6.	Hiroaki Yoshida, Takanori Maeno, Ryo Kawatani, Yumi Miyaji and Hiroharu Ajiro : Ultra-stretchable Transparent Hydrogels with Low Hydrophobic and Amphiphilic Monomers Using Asymmetric Crosslinker to Give Low Mechanical Hysteresis, Chemistry - A European Journal, 31, 55, e00778, 2025. (Summary) Exploring a reasonable network design to develop highly stretchable hydrogels with over 1,000% extension is still a big challenge in the field of hydrogel chemistry and materials. Micellar copolymerization with hydrophobic monomers and surfactants/proteins is a well-studied approach to provide stretchable hydrogels with hydrophobic association domains as sacrificial bonds when subjected to large deformation, but some limitations, such as dose increase of such monomers and surfactant-free synthesis have not yet been well considered. In this study, we demonstrate a simple but powerful approach to produce transparent, ultra-stretchable hydrogels expressing more than 3,000% elongation by surfactant-free copolymerization of low hydrophobic monomer and amphiphilic monomer. We believe that this result offers wider availability of low hydrophobic groups in various water-containing polymer materials, including gels, micelles, etc. (Link to Publication Site) ● Publication site (DOI): 10.1002/chem.202500778 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 40767022 ● Summary page in Scopus @ Elsevier: 2-s2.0-105012591962 (DOI: 10.1002/chem.202500778, PubMed: 40767022, Elsevier: Scopus)
7.	Masatoshi Ohyama, Ryo Kawatani, Naoki Ohtani, Ryo Fukuchi, Rie Yasuda, Hirotsugu Kuratani, Shinsuke Miyauchi and Yasuhiro Kohsaka : RauhutCurrier Polyaddition: Self-Polymerization of Divalent Aryl Vinyl Ketones for Unsaturated Polyketones, Macromolecules, 58, 11, 5796-5806, 2025. (Link to Publication Site) ● Publication site (DOI): 10.1021/acs.macromol.5c00990 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-105006846187 (DOI: 10.1021/acs.macromol.5c00990, Elsevier: Scopus)
8.	Natsumi Nishiie, Ryo Kawatani, Sae Tezuka, Miu Mizuma, Mikihiro Hayashi and Yasuhiro Kohsaka : Vitrimer-like elastomers with rapid stress-relaxation by high-speed carboxy exchange through conjugate substitution reaction, Nature Communications, 15, 1, 8657, 2024. (Summary) We report vitrimer-like elastomers that exhibit significantly fast stress relaxation using carboxy exchange via the conjugate substitution reaction of α-(acyloxymethyl) acrylate skeletons. This network design is inspired by a small-molecule model that shows the carboxy exchange reaction even at ambient temperature in the presence of 1,4-diazabicyclo[2.2.2]octane (DABCO). The acrylate and acrylic acid copolymers are cross-linked using bis[α-(bromomethyl)acrylates] and doped with 10 wt% DABCO, exhibiting processability to obtain a transparent film by hot pressing. The high-speed bond exchange in the network, validated by stress-relaxation tests, allows quick molding with household iron. In addition, the material is applied as an adhesion sheet for plastic and metal substrates. Because dynamic cross-linking with the proposed bond exchange mechanism can be implemented for any polymer bearing carboxyl pendants, our approach can be applied to versatile backbones, which must thus be meaningful in the practical sense. (Tokushima University Institutional Repository) ● Metadata: 2012303 (Link to Publication Site) ● Publication site (DOI): 10.1038/s41467-024-53043-5 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 39368967 ● Search Scopus @ Elsevier (PMID): 39368967 ● Search Scopus @ Elsevier (DOI): 10.1038/s41467-024-53043-5 (Tokushima University Institutional Repository: 2012303, DOI: 10.1038/s41467-024-53043-5, PubMed: 39368967)
9.	Ryo Kawatani, Mizuki Yoshino, Hironori Matsuzaki, Takeshi Miyamoto and Yasuhiro Kohsaka : Noncorrosive Pressure-Sensitive Adhesives of Acryl Polymers bySulfur-Free AdditionFragmentation Chain Transfer Agents, Macromolecules, 57, 8861-8868, 2024. (Tokushima University Institutional Repository) ● Metadata: 2012295 (Link to Publication Site) ● Publication site (DOI): 10.1021/acs.macromol.4c01418 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85204212877 (Tokushima University Institutional Repository: 2012295, DOI: 10.1021/acs.macromol.4c01418, Elsevier: Scopus)
10.	Ryo Kawatani, Yoshino Aoki, Souichi Tezuka, Yoshikazu Kimura and Yasuhiro Kohsaka : Synthesis of itaconyl dichloride with high purity and its application to polycondensation, Tetrahedron, 161, 134071, 2024. (Keyword) Itaconic acid / Dichloromethyl alkyl ether / Bio-based monomer / polycondensation / Unsaturated polyester (Tokushima University Institutional Repository) ● Metadata: 2012117 (Link to Publication Site) ● Publication site (DOI): 10.1016/j.tet.2024.134071 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85194760400 (Tokushima University Institutional Repository: 2012117, DOI: 10.1016/j.tet.2024.134071, Elsevier: Scopus)
11.	Kazuma Abe, Miyuki Oshimura, Ryo Kawatani, Tomohiro Hirano and Koichi Ute : Synthesis of photodegradable polyesters from bio-based 3,4-dimethoxycinnamic acid and investigation of their degradation behaviors, Polymer, 306, 127204, 2024. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.polymer.2024.127204 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85194087953 (DOI: 10.1016/j.polymer.2024.127204, Elsevier: Scopus)
12.	Yota Chiba, Ryo Kawatani and Yasuhiro Kohsaka : Chemically Recyclable Vinyl Polymers by Free Radical Polymerization of Cyclic Styrene Derivatives, ACS Macro Letters, 12, 1672-1676, 2023. (Link to Publication Site) ● Publication site (DOI): 10.1021/acsmacrolett.3c00573 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1021/acsmacrolett.3c00573 (DOI: 10.1021/acsmacrolett.3c00573)
13.	Ryo Kawatani, Hagiwara Keito, Tanaka Anri and Kohsaka Yasuhiro : Polythioethers Bearing Side Groups for Efficient Degradation by E1cB Reaction: Reaction Design for Polymerization and Main Chain Scission, RSC Advances, 13, 20782, 2023. (Tokushima University Institutional Repository) ● Metadata: 2011818 (Link to Publication Site) ● Publication site (DOI): 10.1039/D3RA03751G (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1039/D3RA03751G (Tokushima University Institutional Repository: 2011818, DOI: 10.1039/D3RA03751G)
14.	Ryo Kawatani, Taiga Hamawaki, Tomonori Waku, Naoki Tanaka and Hiroharu Ajiro : Evaluation of Biocompatible Films using Copolymers of N-Vinylbenzamide with Cationic Moieties by Hydrolysis of N-Vinylformamide, Macromolecular Chemistry and Physics, 224, 2200386, 2023. (Tokushima University Institutional Repository) ● Metadata: 2011817 (Link to Publication Site) ● Publication site (DOI): 10.1002/macp.202200386 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1002/macp.202200386 (Tokushima University Institutional Repository: 2011817, DOI: 10.1002/macp.202200386)
15.	Yoshiaki Haramiishi, Ryo Kawatani, Nalinthip Chanthaset and Hiroharu Ajiro : Preparation of block copolymer of poly(trimethylene carbonate) with oligo(ethylene glycol) and the surface properties of the dip coated film, Polymer Testing, 86, 106484-e49154, 2020. (Tokushima University Institutional Repository) ● Metadata: 2011816 (Link to Publication Site) ● Publication site (DOI): 10.1016/j.polymertesting.2020.106484 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.polymertesting.2020.106484 (Tokushima University Institutional Repository: 2011816, DOI: 10.1016/j.polymertesting.2020.106484)
16.	Ryo Kawatani, Kelland A. Malcolm and Ajiro Hiroharu : Design of a Rigid Side Chain for Poly(N-vinylamide) Derivatives Bearing an Alkenyl Group and Evaluation of Their Ability to Inhibit Tetrahydrofuran Hydrate Crystal Growth, Journal of Applied Polymer Science, 2020, e49154, 2020. (Tokushima University Institutional Repository) ● Metadata: 2011815 (Link to Publication Site) ● Publication site (DOI): 10.1002/app.49154 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1002/app.49154 (Tokushima University Institutional Repository: 2011815, DOI: 10.1002/app.49154)
17.	Kenta Yamatani, Ryo Kawatani and Hiroharu Ajiro : Synthesis of Glucosamine Derivative with Double Caffeic Acid Moieties at N- and 6-O-Positions for Developments of Natural Based Materials, Journal of Molecular Structure, 1206, 127689, 2020. (Tokushima University Institutional Repository) ● Metadata: 2011814 (Link to Publication Site) ● Publication site (DOI): 10.1016/j.molstruc.2020.127689 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.molstruc.2020.127689 (Tokushima University Institutional Repository: 2011814, DOI: 10.1016/j.molstruc.2020.127689)
18.	Haramiishi Yoshiaki, Ryo Kawatani, Chanthaset Nalinthip and Ajiro Hiroharu : Viscoelastic Evaluation of Poly(trimethylene carbonate)s Bearing Oligoethylene glycol Units Which Shows Thermoresponsive Properties at Body Temperature, Macromolecular Chemistry and Physics, 220, 1900019, 1-6, 2019. (Tokushima University Institutional Repository) ● Metadata: 2011813 (Link to Publication Site) ● Publication site (DOI): 10.1002/macp.201900019 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1002/macp.201900019 (Tokushima University Institutional Repository: 2011813, DOI: 10.1002/macp.201900019)
19.	Ryo Kawatani, Yuki Kawata, Shin-ichi Yusa, Malcolm A. Kelland and Hiroharu Ajiro : Synthesis of Thermosensitive Poly(N-vinylamide) Derivatives Bearing Oligo Ethylene Glycol Chain for Kinetic Hydrate Inhibitor, Macromolecules, 51, 19, 7845-4852, 2018. (Tokushima University Institutional Repository) ● Metadata: 2011812 (Link to Publication Site) ● Publication site (DOI): 10.1021/acs.macromol.8b01573 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1021/acs.macromol.8b01573 (Tokushima University Institutional Repository: 2011812, DOI: 10.1021/acs.macromol.8b01573)
20.	Zhang Qian, Ryo Kawatani, Ajiro Hiroharu and Kelland A. Malcolm : Optimizing the Kinetic Hydrate Inhibition Performance of NAlkylNVinylamide Copolymers, Energy & Fuels, 32, 4925-4931, 2018. (Link to Publication Site) ● Publication site (DOI): 10.1021/acs.energyfuels.8b00251 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1021/acs.energyfuels.8b00251 (DOI: 10.1021/acs.energyfuels.8b00251)
21.	Ryo Kawatani, Nishiyama Yasuhiro, Kamikubo Hironari, Kakiuchi Kiyomi and Ajiro Hiroharu : Aggregation control by multi-stimuli-responsive poly(N-vinylamide) derivatives in aqueous system, Nanoscale Research Letters, 12, 461-467, 2017. (Tokushima University Institutional Repository) ● Metadata: 2011811 (Link to Publication Site) ● Publication site (DOI): 10.1186/s11671-017-2221-7 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1186/s11671-017-2221-7 (Tokushima University Institutional Repository: 2011811, DOI: 10.1186/s11671-017-2221-7)
22.	Ryo Kawatani, Kan Kai, Kelland A. Malcolm, Akashi Mitsuru and Ajiro Hiroharu : Remarkable Effect on Thermosensitive Behavior Regarding Alkylation at the Amide Position of Poly(N-vinylamide)s, Chemistry Letters, 45, 6, 589-591, 2016. (Keyword) General Chemistry (Tokushima University Institutional Repository) ● Metadata: 2011810 (Link to Publication Site) ● Publication site (DOI): 10.1246/cl.160145 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1360565169059210496 ● Search Scopus @ Elsevier (DOI): 10.1246/cl.160145 (Tokushima University Institutional Repository: 2011810, DOI: 10.1246/cl.160145, CiNii: 1360565169059210496)

Review, Commentary:

1.	高坂泰弘, 風間茜 and Ryo Kawatani : ケミカルリサイクルが可能なビニルポリマーおよびポリエステルの開発, Chemical Industry, 72, 10, 248-256, 2022. (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1520291856305206912 (CiNii: 1520291856305206912)
2.	高坂泰弘 and Ryo Kawatani : Novel Polymers for Resource Recycling on the Molecular Level, Journal of the Society of Fiber Science and Technology, 78, 3, 111-115, 2022. (Keyword) General Medicine (Link to Publication Site) ● Publication site (DOI): 10.2115/fiber.78.111 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390854717504247552 ● Search Scopus @ Elsevier (DOI): 10.2115/fiber.78.111 (DOI: 10.2115/fiber.78.111, CiNii: 1390854717504247552)
3.	Ryo Kawatani, 野田拓海, 赤江要祐 and 高坂泰弘 : ケミカルリサイクルを志向したビニルポリマーおよびポリエステルの分子設計, 日本ゴム協会誌, 95, 11, 319-325, 2022.
4.	Yasuhiro Kohsaka, Yosuke Akae, Ryo Kawatani and Akane Kazama : Polymer chemistry of α-substituted acrylatges designed for functional-group synergy, Journal of Macromolecular Science - Pure and Applied Chemistry, 59, 2, 83-97, 2021. (Link to Publication Site) ● Publication site (DOI): 10.1080/10601325.2021.1989311 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1080/10601325.2021.1989311 (DOI: 10.1080/10601325.2021.1989311)

Proceeding of International Conference:

1.	eito takemura, Ryo Kawatani and Tomohiro Hirano : Elucidating the influence of lithium coordination on radical polymerization behavior of ethyl 2-acrylate, IUPAC 51st World Polymer Congress (MACRO 2026), Kuching (Malaysia), Jul. 2026.
2.	tsukaguchi yuta, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : Evaluation of the Utility of Molecular Weight Estimation for End-Modified Polystyrenes via Multivariate Analysis of ¹H NMR Spectra, IUPAC 51st World Polymer Congress (MACRO 2026), Kuching (Malaysia), Jul. 2026.
3.	Ryo Kawatani, YAMANO Ryoga and Tomohiro Hirano : Synthesis and Radical Polymerization of a Bio-Based Cyclic Acrylate Derived from Itaconyl Dichloride and 1,4-Butanediol, Bordeaux Polymer Conference 2026 (BPC2026), Bordeaux, France, Jun. 2026.
4.	Yuta Tsukaguchi, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : Analysis of 1H NMR Spectra of End-capped Polystyrene Using a Chain Transfer Agent to Analyze the Chain-end Structure, The 19th Pacific Polymer Conference (PPC19), Kokura, Jul. 2025.
5.	Yusuke Horita, Ju-Ting Sun, Ryotaro Miyoshi, Ryo Kawatani and Tomohiro Hirano : Unusual phase transition behavior of poly(N-acryloylglycine methyl ester) in water, The 19th Pacific Polymer Conference (PPC19), Kokura, Jul. 2025.
6.	Ryo Kawatani, Teppei Takahashi and Tomohiro Hirano : Radical Polymerization of Sulfur-Free Cyclic Acrylic Anhydrides with Leaving Groups at the Allylic Position, The 19th Pacific Polymer Conference (PPC19), Kokura, Jul. 2025.
7.	Ryo Kawatani and Kohsaka Yasuhiro : Investigation for Mechanical Properties of Polyurethane-Polyacrylate Hydrogels Prepared by Parallel Polymerization of Polyaddition and Radical Polymerization, The 13th SPSJ International Polymer Conference (IPC2023), 2023.

Proceeding of Domestic Conference:

1.	鈴木菜々美, Ryo Kawatani and Tomohiro Hirano : N,N-ジメチルアクリルアミドとp-メトキシスチレンとのラジカル共重合 ∼金属カチオンとの錯形成を利用した連鎖制御∼, 第75回高分子討論会, Sep. 2026.
2.	NAKAHARA Yuto, Ryo Kawatani and Tomohiro Hirano : 酸分解性主鎖構造の導入を志向した1-フェニルエチル-2-フェニルアクリレートのラジカル共重合, 高分子討論会, Sep. 2026.
3.	NISHIMURA Yuma, Ryo Kawatani and Tomohiro Hirano : 六員環アクリルイミドのアニオン重合挙動におけるイミドN-Hの役割, 高分子討論会, Sep. 2026.
4.	TSUKAGUCHI Yuta, Ryo Kawatani and Tomohiro Hirano : 1H NMRスペクトルの多変量解析を用いた末端修飾ポリスチレンの分子量推定, 高分子討論会, Sep. 2026.
5.	王禹恆, 平井健斗, Ryo Kawatani and Tomohiro Hirano : Li+との選択的錯形成を利用した N-置換フマルアミド酸エステルの位置選択的ラジカル重合, 第72回高分子研究発表会(関西), Jul. 2026.
6.	TSUKAGUCHI Yuta, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : 1H NMR スペクトルの多変量解析による末端修飾ポリスチレンの分子量推定における有用性評価, 第75回高分子学会年次大会, May 2026.
7.	原田将吾, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : 1H-NMR スペクトルの多変量解析を利用したポリエステル共重合体のモノマー連鎖解析, 第3回高分子学会NMRシンポジウム, Dec. 2025.
8.	玉越麗奈, 西村仁志, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : 1H-NMR スペクトルの多変量解析を用いたスチレン/ジアクリレートゲルの構造解析, 第30回高分子分析討論会, Nov. 2025.
9.	WAKAI Retsu, Ryo Kawatani and Tomohiro Hirano : けい皮酸クロリドを原料としたN-ビニルけい皮酸アミドの合成および重合検討, 第74回高分子討論会, Sep. 2025.
10.	YAMANO Ryoga, Ryo Kawatani and Tomohiro Hirano : イタコン酸ジクロリドと1,4-ブタンジオールを原料とした環状アクリレートのラジカル重合, 第74回高分子討論会, Sep. 2025.
11.	TAKEMURA Eito, Ryo Kawatani and Tomohiro Hirano : Li塩を添加したエチル2-(ヒドロキシメチル)アクリレートのラジカル共重合, 第74回高分子討論会, Sep. 2025.
12.	TSUKAGUCHI Yuta, Ryo Kawatani and Tomohiro Hirano : 連鎖移動剤を用いて合成したアルキル末端を有するポリスチレンの1H NMRスペクトルの多変量解析による末端構造解析, 第74回高分子討論会, Sep. 2025.
13.	TAKATA Risa, Ryo Kawatani and Tomohiro Hirano : アリル位にイソプロピル基を有する環状アクリルイミドのラジカル共重合, 第74回高分子討論会, Sep. 2025.
14.	小川大空, Ryo Kawatani and Tomohiro Hirano : 低温ラジカル重合で合成したポリ(N-ビニル-ε-カプロラクタム)の相転移挙動, 第74回高分子討論会, Sep. 2025.
15.	玉越麗奈, 西村仁志, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : 高分子反応と¹H NMRスペクトルの多変量解析との組み合わせによるスチレン/ジアクリレートゲルの構造解析, 第74回高分子討論会, Sep. 2025.
16.	植木悠斗, Koichi Ute, Atsushi Tabata, Hitoshi Matsuki, Masaki GOTO, Ryo Kawatani and Tomohiro Hirano : カチオン性高吸水性ポリマーによるリポソームの吸着挙動, 第71回高分子研究発表会(神戸), Jul. 2025.
17.	鈴木菜々美, Ryo Kawatani and Tomohiro Hirano : N,N-ジメチルアクリルアミドとp-メトキシスチレンとのラジカル共重合 ∼Li+との錯形成を利用した連鎖制御∼, 第71回高分子研究発表会(神戸), Jul. 2025.
18.	Yuta Tsukaguchi, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : 連鎖移動剤を用いて合成した芳香族末端を有するポリスチレンの1H NMRスペクトルの多変量解析による末端構造解析, 第71回高分子研究発表会(神戸), Pa-16, Jul. 2025.
19.	三好亮太朗, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : 1H NMRスペクトルの多変量解析によるビニルアルコール/酢酸ビニル共重合体の連鎖解析, 2024年日本化学会中国四国支部大会岡山大会, Nov. 2024.
20.	TOKIOKA Ryuya, Ryo Kawatani and Tomohiro Hirano : Ethyl 3-methyl-5-methylene-2,6-dioxo-4-phenylpiperidine-3-carboxylateのラジカル重合検討, 日本化学会中国四国支部大会 PA-22, Nov. 2024.
21.	TAKAHASHI Teppei, Ryo Kawatani and Tomohiro Hirano : アリル位にフェニル基と2-メチルアセト酢酸エステル基を有する環状アクリル無水物のラジカル(共)重合, 日本化学会中国四国支部大会 PA-15, Nov. 2024.
22.	玉越麗奈, 西村仁志, 竹田大登, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : ジアクリレートとスチレンとのラジカル共重合で合成したゲルのエステル交換反応を利用した構造解析, 第29回高分子分析討論会, Nov. 2024.
23.	玉越麗奈, 西村仁志, 竹田大登, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : ジアクリレートとスチレンとのラジカル共重合で合成したゲルの構造解析, 第73回高分子討論会, Sep. 2024.
24.	西村仁志, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : 1H NMRスペクトルの多変量解析によるアクリル酸メチル/スチレン共重合体の統計的連鎖解析, 第73回高分子討論会, Sep. 2024.
25.	TAKAHASHI Teppei, Ryo Kawatani and Tomohiro Hirano : アリル位にフェニル基と脱離基を有する環状アクリル無水物のラジカル(共)重合, 第73回高分子討論会 1Pe001, Sep. 2024.
26.	原匠, ⻩凱銘, Miyuki Oshimura, Ryo Kawatani, Tomohiro Hirano and Koichi Ute : ポリビニルアルコール側鎖へのアミノ基修飾と pH 応答性評価∼第⼀級及び第⼆級アミノ酸エステルの違いが及ぼす影響, 第70回高分子研究発表会(神戸)・70周年記念講演会, Jul. 2024.
27.	堀田悠介, 孫瑞廷, 三好亮太朗, Ryo Kawatani and Tomohiro Hirano : ポリ(N-アクリロイルグリシンメチルエステル)の水中での特異な相転移挙動, 第70回高分子研究発表会(神戸)・70周年記念講演会, Jul. 2024.
28.	西村仁志, Ryo Kawatani, Kohei Torii, Ken Yoshida, Hitoshi Mizuguchi and Tomohiro Hirano : 1H NMRスペクトルの多変量解析によるアクリル酸メチル/スチレン共重合体の連鎖解析, 第70回高分子研究発表会(神戸)・70周年記念講演会, Jul. 2024.
29.	Miyuki Oshimura, 阿部一磨, Ryo Kawatani, Tomohiro Hirano and Koichi Ute : リグニン誘導体の二量化およびジオールとの縮合によるポリエステル合成とその熱特性および分解性評価, 第73回高分子学会年次大会, Jun. 2024.
30.	大谷尚輝, Ryo Kawatani and 高坂泰弘 : 環状アクリルイミドのラジカル重合:置換基導入による共重合性の改善, 第73回高分子討論会 2C14, 2024.
31.	Ryo Kawatani, 吉野聖月 and 高坂泰弘 : 硫黄フリー粘着剤を志向した連鎖移動剤の開発, 第187回東海高分子研究会講演会(夏季研究会), 2023.
32.	西家菜摘, 手塚紗英, Ryo Kawatani, 林幹大 and 高坂泰弘 : 共役置換反応に基づく可逆的結合交換を利用したアクリル酸共重合体の架橋と物性, 第72回高分子年次大会, 2023.
33.	大谷尚輝, Ryo Kawatani and 高坂泰弘 : 嵩高い置換基を有するアクリル型環状イミドモノマーのラジカル重合, 第72回高分子年次大会, 2023.
34.	千葉耀太, Ryo Kawatani and 高坂泰弘 : ペンダント基による改質が可能な循環型スチレンモノマーの開発, 第72回高分子年次大会, 2023.
35.	鳥澤華恵, 風間茜, Ryo Kawatani and 高坂泰弘 : 芳香環上に置換基を導入した変性脱水アスピリンの重合とポリマーの分解性評価, 第72回高分子年次大会, 2023.
36.	竹内真凜, Ryo Kawatani, 信川省吾 and 高坂泰弘 : アゾベンゼンをコアに有するポリ(δ-デカノラクトン)の合成とポリウレタン化, 第72回高分子年次大会, 2023.
37.	平林章司, 千葉耀太, Ryo Kawatani and 高坂泰弘 : 3-メチレンフタリドのカチオン重合, 第72回高分子年次大会, 2023.
38.	西家菜摘, Ryo Kawatani, 林幹大 and 高坂泰弘 : 共役置換反応を利用したビトリマー性アクリルエラストマーの創成:高速結合交換に基づく迅速な応力緩和, 第72回高分子討論会, 2023.
39.	大山真賢, 安田理恵, 鞍谷裕嗣, 宮内信輔, Ryo Kawatani and 高坂泰弘 : ビニルケトンの優れた求電子性を活かした重付加反応の開発, 第72回高分子討論会, 2023.
40.	竹内真凜, 池谷岳紀, Ryo Kawatani, 信川省吾 and 高坂泰弘 : アゾベンゼン含有ポリウレタンエラストマーの合成と光可塑化:アゾベンゼンの挿入位置が光可塑化に与える影響, 第72回高分子討論会, 2023.
41.	平林章司, 千葉耀太, Ryo Kawatani and 高坂泰弘 : 様々な特性結合を持つ環状スチレン誘導体の重合:特性結合が重合性に与える効果, 第72回高分子討論会, 2023. (Keyword) ケミカルリサイクル
42.	吉野聖月, 宮本豪, Ryo Kawatani and 高坂泰弘 : 非硫黄系連鎖移動剤を用いた粘着剤の末端構造解析と物性評価, 第32回ポリマー材料フォーラム, 2023. (Keyword) アクリル粘着剤 / ラジカル連鎖移動剤

Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)

Design of Cyclic Acrylic Monomers for Radical Polymerization (Project/Area Number: 25K18072 )
Strategy for Materials Recycling by Synergy of Vinyl Groups and Cyclic Skeletons (Project/Area Number: 23K23397 )
Development of Self-immolative Polymers by Radical Ring-Opening Polymerization (Project/Area Number: 22K14723 )
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Assistant Professor : Kawatani, Ryo

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Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)