信州大学ロゴ

Publication

Original papers

  1. 3-Methylenephthalide derivatives

    "3-Methylenephthalide derivatives enable degradation of vinyl (co)polymers via simultaneous main- and side-chain cleavage"
    Y. Chiba, Y. Hirabayashi, Y. Kohsaka, Polym. Chem. 2026.

  2. Vitrimer-like acrylic glass

    "Vitrimer-like acrylic glass with fast stress relaxation by high-speed carboxy exchange reaction"
    Y. Kohsaka, M. Mizuma, M. Hayashi, RSC Appl. Polym. 2025. (Open Access)

  3. Poly(bridged bicycle)s synthesized via cyclopolymerization Pioneering Investigators 2025 Cover

    "Poly(bridged bicycle)s synthesized via cyclopolymerization of cyclic diacrylates"
    Y. Kohsaka, T. Yoshida, N. Nishiie, Polym. Chem. 2025, 16, 4009-4012.
    Pioneering Investigators 2025 Invited

  4. Iterative Synthesis and Marine-Biodegradation Assessment

    "Iterative Synthesis and Marine-Biodegradation Assessment of Discrete Oligomers Based on Poly(Butylene Succinate), Poly(Ethylene Terephthalate), Polyamide 6, and Polyisoprene"
    T. Kubo, R. T. Ananthu, T. Noda, Y. Amamoto, H. Taguchi, Y. An, R. Kamiki, C. Homma, H. Masunaga, S. Sasaki, M. Uchiyama, M. Kamigaito, T. Kikuchi, Y. Kohsaka, A. Takahara, K. Satoh, Macromolecules 2025, 58 (16), 8649–8657. (Open Access)

  5. Main-Chain Scission of Acrylic Polymers

    "Main-Chain Scission of Acrylic Polymers via Intrachain Transesterification and Their Application in UV-curable Dismountable Adhesives"
    Y. Kohsaka, K. Naganuma, ACS Polyms Au 2025, 5, (5), 481–487. (Open Access)

  6. Synthesis and polymerization of modified dehydroaspirin

    "Synthesis and polymerization of modified dehydroaspirin with increased stability and polymer solubility"
    Y. Kohsaka, H. Torisawa, A. Kazama, Polym. J. 2025, in press. (Open Access)

  7. Enhanced Recyclability of Methacrylic Resins Chemical Science Front Cover

    "Enhanced Recyclability of Methacrylic Resins by Copolymerization or Pendant Modification Using Trityl Esters"
    Y. Chiba, S. Hirabayashi, Y. Kohsaka, Chemical Science 2025, 16, 12804-12811. (Open Access)

  8. Rauhut–Currier Polyaddition

    "Rauhut–Currier Polyaddition: Self-Polymerization of Divalent Aryl Vinyl Ketones for Unsaturated Polyketones"
    M. Ohyama, R. Kawatani, N. Ohtani, R. Fukuchi, R. Yasuda, H. Kuratani, S. Miyauchi, Y. Kohsaka, Macromolecules 2025, 58, 5796-5806.
    (Collaborated work with Osaka Gas Chemicals Co. Ltd.)

  9. Vinyl Ketones Containing Fluorene Skeletons

    "Vinyl Ketones Containing Fluorene Skeletons for Acrylic Resins with High Refractive Index and Negative Birefringence"
    M. Ohyama, R. Yasuda, H. Kuratani, S. Miyauchi, Y. Kohsaka, J. Polym. Sci. 2025, 63, 650-657.
    (Collaborated work with Osaka Gas Chemicals Co. Ltd.) (Open Access)

  10. Vitrimer-like Elastomers with Rapid Stress-Relaxation

    "Vitrimer-like Elastomers with Rapid Stress-Relaxation by High-Speed Carboxy Exchange through Conjugate Substitution Reaction"
    N. Nishiie, R. Kawatani, S. Tezuka, M. Mizuma, M. Hayashi, Y. Kohsaka, Nat. Commun. 2024, 15, 8657.
    (Collaborated work with Dr. M. Hayashi at NITech)

  11. Carbon-Resource Recovery from Vinyl Polymers ACS Sustain. Resour. Manage. Cover

    "Carbon-Resource Recovery from Vinyl Polymers of Cyclic Ketene Acetal Esters Using High-Temperature Water"
    Y. Kohsaka, A. Kazama, K. Matsuo, S. Deguchi, M. Osada, ACS Sustain. Resour. Manage. 2024, 1, 2234-2240.
    (Collaborated work with Prof. Deguchi at JAMSTEC and Prof. Osada at Shinshu Univ.)

  12. Noncorrosive Pressure-Sensitive Adhesives

    "Noncorrosive Pressure-Sensitive Adhesives of Acryl Polymers by Sulfur-Free Addition–Fragmentation Chain Transfer Agents"
    R. Kawatani, Y. Mizuki, H. Matsuzaki, T. Miyamoto, Y. Kohsaka, Macromolecules 2024, 57, 8861.
    (Collaborated work with Soken Chemical & Engineering Co., Ltd.)

  13. Divalent vinyl ketones derived from fluorene

    "Divalent vinyl ketones derived from fluorene: a facile synthesis of bifunctional acrylic monomers with high reactivity in thia-/aza-Michael addition and Morita-Baylis-Hillman reactions"
    M. Ohyama, R. Yasuda, S. Miyauchi, Y. Kohsaka, Polym. J. 2024, 56, 1111-1116.
    (Collaborated work with Osaka Gas Chemical Co., Ltd.) (Open Access)

  14. Fast and Selective Main-Chain Scission of Vinyl Polymers ACS Macro Lett. Cover

    "Fast and Selective Main-Chain Scission of Vinyl Polymers Using the Domino Reaction in the Alternating Sequence for Transesterification"
    Y. Kohsaka, K. Toyama, M. Kawauchi, K. Naganuma, ACS Macro Lett. 2024, 13, 1016-1021.

  15. Synthesis of itaconyl dichloride with high purity

    "Synthesis of itaconyl dichloride with high purity and its application to polycondensation"
    R. Kawatani, Y. Aoki, S. Tezuka, Y. Kimura, Y. Kohsaka, Tetrahedron, 2024, 161, 134071.
    (Collaborated work with Iharanikkei Chemical Industry Co. Ltd.)

  16. Regulatable endothermic behavior of one-chain-tethered sliding graft copolymers

    "Regulatable endothermic behavior of one-chain-tethered sliding graft copolymers as novel solid-solid phase change materials"
    J. Araki, C. Otsubo, S. Morimoto, K. Ohta, Y. Kohsaka, Polymer, 2024, 294, 126687.
    (Collaborated work with Prof. Araki and Prof. Ohta)

  17. Degradation of poly(conjugated ester)s

    "Degradation of poly(conjugated ester)s using a conjugate substitution reaction with various amines and amino acids in aqueous media."
    T. Noda, T. Kitagawa, Y. Kohsaka, Polym. J. 2024, 56, 343–353.
    (Invited for a special issue of Polymer Degradation for a Sustainable Future)

  18. Chemically Recyclable Vinyl Polymers ACS Macro Lett. Cover

    "Chemically Recyclable Vinyl Polymers by Free Radical Polymerization of Cyclic Styrene Derivatives"
    Y. Chiba, R. Kawatani, Y. Kohsaka, ACS Macro Lett. 2023, 12 (12), 1672–1676.
    (Ranked 2nd in Most Read papers in 30 days)

  19. Polythioethers bearing side groups for efficient degradation

    "Polythioethers bearing side groups for efficient degradation by E1cB reaction: reaction design for polymerization and main-chain scission"
    R. Kawatani, K. Hagiwara, A. Tanaka, Y. Kohsaka, RSC Advances, 2023, 13, 20782-20786.

  20. Unsaturated polyurethanes degradable by conjugate substitution

    "Unsaturated polyurethanes degradable by conjugate substitution reactions with amines and carboxylate anions"
    T. Noda, A. Tanaka, Y. Akae, Y. Kohsaka, RSC Adv. 2023, 13, 20336-20341.

  21. Polymeric Surfactants Bearing Divalent Carboxy Pendants

    "Polymeric Surfactants Bearing Divalent Carboxy Pendants for Stable Color Dispersions with High Redispersibility"
    T. Ohtake, H. Ito, K. Horiba, N. Toyoda, Y. Kohsaka, ACS Appl. Mater. 2023, 5 (7), 4901–4909.

  22. Effect of Amino Group Modification at Allyl Position Polym. Chem. Front Cover

    "Effect of Amino Group Modification at Allyl Position of Methacrylamides on Polymerization and Polymer pH-/Thermo-Responsiveness"
    Y. Kohsaka, N. Chinbat, K. Ito, Y. Akae, Polym. Chem. 2023, 14, 1585-1590.
    (Front Cover), (Invited Article)

  23. Highly integrated, breathable, metalized phase change fibrous membranes

    "Highly integrated, breathable, metalized phase change fibrous membranes based on hierarchical coaxial fiber structure for multimodal personal thermal management"
    J. Wu, M. Wang, L. Dong, Y. Zhang, J. Shi, M. Ohyama, Y. Kohsaka, C. Zhu, H. Morikawa, Chem. Eng. J. 2023, 465, 142835.

  24. High-Speed Synthesis of Thermo-responsive Polymers

    "High-Speed Synthesis of Thermo-responsive Polymers by Boosted Polymerization of N,N-Diethyl Acrylamide in High-Temperature Water"
    S. Ishii, A. Sezai, Y. Kohsaka, S. Deguchi, M. Osada, Ind. Eng. Chem. Res. 2022, 61, 46, 17012–17016.

  25. Diverse chemically recyclable polymers Polym. Chem. Back Cover

    "Diverse chemically recyclable polymers obtained by cationic vinyl and ring-opening polymerizations of the cyclic ketene acetal ester 'dehydroaspirin'"
    A. Kazama, Y. Kohsaka, Polym. Chem. 2022, 13, 6484-6491.
    (Back Cover)

  26. A Trimode Thermoregulatory Flexible Fibrous Membrane

    "A Trimode Thermoregulatory Flexible Fibrous Membrane Designed with Hierarchical Core–Sheath Fiber Structure for Wearable Personal Thermal Management"
    J. Wu, M. Wang, L. Dong, J. Shi, M. Ohyama, Y. Kohsaka, C. Zhu, H. Morikawa, ACS Nano, 2022, 16, 8, 12801–12812.

  27. Synthesis of polyarylates and aliphatic polyesters

    "Synthesis of polyarylates and aliphatic polyesters by divalent acyl-1,2,4-triazole: a route to metal-free synthesis at low temperature"
    Y. Kohsaka, I. Mori, K. Homma, Y. Akae, D. Matsuura, Y. Kimura, Polym. J. 2021, 57, 887-893.

  28. Magnesium bromide (MgBr2) as a catalyst

    "Magnesium bromide (MgBr2) as a catalyst for living cationic polymerization and ring-expansion cationic polymerization"
    Y. Daito, R. Kojima, N. Kusuyama, Y. Kohsaka, M. Ouchi, Polym. Chem. 2021, 12, 702-710.
    (Collaboration with Prof. Ouchi's Group in Kyoto University; Invited for 'Molecularly Defined Polymers: Synthesis and Function')

  29. Controls and Effects of Monomer Junctions

    "Controls and Effects of Monomer Junctions and Sequences in Curable and Degradable Polyarylate Containing Acrylate Moieties"
    Y. Kohsaka, K. Nagai, Macromol. Rapid Commun. 2021, 42, 2000570.

  30. Degradable and curable poly(conjugated ester)s

    "Degradable and curable poly(conjugated ester)s prepared by acryl- and conjugate-substitutions of the 'smallest' monomer"
    Y. Kohsaka, K. Nagai, Eur. Polym. J. 2020, 141, 110049.

  31. Divergence of polycondensation Polym. Chem. Back Cover

    "Divergence of polycondensation by a tandem reaction based on sequential conjugate substitutions"
    K. Hagiwara, Y. Kohsaka, Polym. Chem. 2020, 11, 5128-5132.
    (Back Cover)

  32. End-reactive poly(tetrahydrofuran)

    "End-reactive poly(tetrahydrofuran) for functionalization and graft copolymer synthesis via a conjugate substitution reaction"
    Y. Kohsaka, N. Nagatsuka, Polym. J. 2020, 52, 75.

  33. Synthesis of Poly(Conjugated Ester)s

    "Synthesis of Poly(Conjugated Ester)s by Ring-Opening Polymerization of Cyclic Hemiacetal Ester Bearing Acryl Skeleton"
    Y. Kohsaka, M. Yamashita, Y. Matsuhashi, S. Yamashita, Eur. Polym. J. 2019, 120, 109185.

  34. Synthesis and properties of polyethers

    "Synthesis and properties of polyethers containing 1,3-butadiene skeleton in the backbones"
    Y. Kohsaka, A. Hiramatsu, Chem. Lett. 2019, 48, 894.

  35. Radical Polymerization of Dehydroaspirin Polym. Chem. Inside Cover

    "Radical Polymerization of 'Dehydroaspirin' with a Formation of Hemiacetal Ester Skeleton: A Hint for Recyclable Vinyl Polymers"
    A. Kazama, Y. Kohsaka, Polym. Chem. 2019, 10, 2764-2768.
    (Inside Cover)

  36. Conjugate substitution and addition of α-substituted acrylate

    "Conjugate substitution and addition of α-substituted acrylate: a highly efficient, facile, convenient, and versatile approach to fabricate degradable polymers"
    Y. Kohsaka, T. Miyazaki, K. Hagiwara, Polym. Chem. 2018, 9, 1610-1617.
    (Invited as Emerging Innovators)

  37. Bifunctional Acyl-1,2,4-triazole

    "Bifunctional Acyl-1,2,4-triazole: An Alternative Monomer of Dicarbonyl Chloride for Metal- and Halogen-Free Polyester Synthesis"
    Y. Kohsaka, K. Homma, I. Mori, S. Sugiyama, Y. Kimura, Chem. Lett. 2018, 47, 221-224.

  38. Esterification with aromatic acyl-1,2,4-triazole

    "Esterification with aromatic acyl-1,2,4-triazole catalyzed by weak base at the rate comparable to acyl chloride"
    Y. Kohsaka, K. Homma, S. Sugiyama, Y. Kimura, Chem. Lett. 2018, 47, 100-102.

  39. Acid- or photo-cleavable polyrotaxane

    "Acid- or photo-cleavable polyrotaxane: Subdivision of supramolecular main-chain type polyrotaxane structure induced by acidolysis or photolysis"
    J. Araki, Y. Honda, Y. Kohsaka, Polymer, 2017, 25, 134-137.

  40. Anionic polymerization of ethyl acrylate

    "Anionic polymerization of ethyl acrylate initiated by tetrabutylammonium azide: direct synthesis of end-clickable polyacrylate"
    Y. Kataoka, Y. Kohsaka, T. Kitaura, S. Domae, S. Ishihara, T. Kitayama, Polym. Chem. 2017, 8, 3858-3861.
    (Front Cover)

  41. Polymerization of α-(Halomethyl)acrylates

    "Polymerization of α-(Halomethyl)acrylates through Sequential Nucleophilic Attack of Dithiols using a Combination of Addition–Elimination and Click Reactions"
    Y. Kohsaka, K. Hagiwara, K. Ito, Polym. Chem. 2017, 8, 976-979.

  42. "Synthesis of isotactic poly[α-(hydroxymethyl)acrylate] by anionic polymerization of the protected monomer"
    Y. Kohsaka, K. Yamamoto, K. Suzawa, T. Kitayama, Polym. Bull. 2017, 74, 1934-1948.

  43. Synthesis of thermo-responsive polymer

    "Synthesis of thermo-responsive polymer via radical (co)polymerization of N,N-dimethyl-α-(hydroxymethyl)acrylamide with N,N-diethylacrylamide"
    Y. Kohsaka, Y. Tanimoto, Polymers 2016, 8, 374.
    (Open Access)

  44. "Synthesis and reaction of block copolymer composed of independently clickable segments via monomer-selective living copolymerization"
    V. Ladelta, Y. Kohsaka, T. Kitayama, Microsystem Tech. in press.

  45. α-Exomethylene lactone possessing acetal-ester linkage

    "α-Exomethylene lactone possessing acetal-ester linkage: Polymerization and postpolymerization modification for water-soluble polymer"
    Y. Kohsaka, Y. Matsumoto, T. Zhang, Y. Matsuhashi, T. Kitayama, J. Polym. Sci. Part A: Polym. Chem. 2016, 54, 955-961.
    (Spotlight Article)

  46. α-(Aminomethyl)acrylate

    "α-(Aminomethyl)acrylate: polymerization and spontaneous post-polymerization modification of β-amino acid ester for a pH/temperature-responsive material"
    Y. Kohsaka, Y. Matsumoto, T. Kitayama, Polym. Chem. 2015, 6, 5026-5029.

  47. Termination of living anionic polymerization

    "Termination of living anionic polymerization of butyl acrylate with α-(chloromethyl)acrylate for end-functionalization and application to the evaluation of monomer reactivity"
    Y. Kohsaka, S. Ishihara, T. Kitayama, Macromol. Chem. Phys. 2015, 216, 1534-1539.

  48. Stereoregular poly(methyl methacrylate) with double-clickable ω-end

    "Stereoregular poly(methyl methacrylate) with double-clickable ω-end: Synthesis and click reaction"
    Y. Kohsaka, K. Yamamoto, T. Kitayama, Polym. Chem. 2015, 6, 3601-3607.
    (Inside Cover)

  49. "C60-Containing polymethacrylates: synthesis, properties, and potential application as n-type semiconductor for organic solar cell"
    V. Ladelta, Y. Kohsaka, T. Ohsnishi, M. Matsumura, T. Kitayama, Polym. Bull. 2015, 72, 1265-1280.

  50. "Stereospecific Anionic Polymerization of α-(Hydroxymethyl)acrylate with Protective Group"
    Y. Kohsaka, K. Suzawa, T. Kitayama, Macromol. Symp. 2015, 350, 86-98.

  51. Synthesis and post-polymerization reaction of end-clickable stereoregular polymethacrylates

    "Synthesis and post-polymerization reaction of end-clickable stereoregular polymethacrylates via termination of stereospecific living anionic polymerization"
    Y. Kohsaka, T. Kurata, K. Yamamoto, S. Ishihara, T. Kitayama, Polym. Chem. 2015, 6, 1078-1087.

  52. Anionic alternating copolymerization

    "Anionic alternating copolymerization of alpha-arylacrylates with methyl methacrylate: effect of monomer sequence on fluorescence"
    Y. Kohsaka, E. Yamaguchi, T. Kitayama, J. Polym. Sci. Part A: Polym. Chem. 2014, 52, 2806-2814.

  53. "Stimuli-degradable cross-linked polymers synthesized by radical polymerization using a size-complementary [3]rotaxane cross-linker"
    K. Iijima, Y. Kohsaka, Y. Koyama, K. Nakazono, S. Uchida, S. Asai, T. Takata, Polym. J. 2014, 46, 67-72.

  54. End-functional stereoregular poly(methyl methacrylate)

    "End-functional stereoregular poly(methyl methacrylate) with clickable C=C bonds: Facile synthesis and thiol-ene reaction"
    Y. Kohsaka, T. Kurata, T. Kitayama, Polym. Chem. 2013, 4, 5043-5047.

  55. "Photo-degradable cross-linked polymer derived from a vinylic rotaxane cross-linker possessing aromatic disulfide axle"
    Y. Koyama, T. Yoshii, Y. Kohsaka, T. Takata, Pure Appl. Chem. 2013, 85, 835-842.

  56. Graft polyrotaxane

    "Graft polyrotaxane: A new class of graft copolymer with mobile graft chains"
    Y. Kohsaka, Y. Koyama, T. Takata, Angew. Chem. Int. Ed. 2011, 50, 10417-10420.
    (Introduced by Chemistry World Magazine 2011)

  57. Size-complementary rotaxane cross-link

    "Size-complementary rotaxane cross-link for stabilization and degradation of supramolecular network"
    Y. Kohsaka, K. Nakazono, Y. Koyama, S. Asai, T. Takata, Angew. Chem. Int. Ed. 2011, 50, 4872-4875.
    (Introduced by NPG Asia Materials 2011)

  58. "An efficient synthetic entry to rotaxanes utilising reversible cleavage of aromatic disulphide bonds"
    T. Yoshii, Y. Kohsaka, T. Moriyama, T. Suzuki, Y. Koyama, T. Takata, Supramol. Chem. 2011, 23, 65-68.

  59. Synthesis of a main chain-type polyrotaxane

    "Synthesis of a main chain-type polyrotaxane consisting of poly(crown ether) and dumbbell sec-ammonium salt and its application to polyrotaxane network"
    Y. Kohsaka, G. Konishi, T. Takata, Polym. J. 2007, 39, 861-873.

  60. "Main chain-type polyrotaxane with controlled ratio of rotaxanated units"
    T. Takata, Y. Kohsaka, G. Konishi, Chem. Lett. 2007, 36, 292-293.

Reviews

  1. "Sustainable synthesis of fine chemicals and polymers using industrial chlorine chemistry"
    Y. Kohsaka, D. Matsuura, Y. Kimura
    Commun. Chem. 2024, 7, 265.

    Sustainable synthesis of fine chemicals

  2. "Polymer chemistry of α-substituted acrylates designed for functional-group synergy"
    Y. Kohsaka, Y. Akae, R. Kawatani, A. Kazama, J. Macromol. Sci. Part A: Pure and Appl. Chem. 2022, 59, 83–97.
    (DOI: 10.1080/10601325.2021.1989311)

  3. "Conjugate substitution reaction of α-(substituted methyl)acrylates in polymer chemistry"
    Y. Kohsaka, Polym. J. 2020, 52, 1175-1183 (DOI/10.1038/s41428-020-0376-z)
    Graphical Abstract

Books

  1. Polyester Resins IN Routledge Resources Online - Polymers, Materials, and Technology
    Y. Kohsaka, CRC Press

  2. "Polyrotaxane network as a topologically cross-linked polymer: Synthesis and properties" In "Supramolecular Polymer Chemistry (Ed. by A. Harada)",
    T. Takata, T. Arai, Y. Kohsaka, M. Shioya, Y. Koyama, pp.331-346 (2012), Wiley-VCH.

Invited Lectures

  1. Marriage of Radical Ring-Opening Polymerization and Domino Reaction Toward Selective Main-Chain Scission of Vinyl Polymers, IP'24(15th International Symposium on Ionic Polymerization), 2024/9/3

  2. Molecular Design for Degradable Vinyl Polymers and Chemical Recycling, IPC2023(The 13th SPSJ International Polymer Conference), 2023/7/21

  3. Atropos Polymerization: Controlled Polymerization by Programmed Termination,World Congress on Living Polymerizations and Polymers (LPP16),2016/5/30

  4. End-clickable stereoregular poly(methyl methacrylate)s by termination of stereospecific anionic polymerization, International Science and Nature Congress (ISNaC),2015 /9/22

  5. Ethyl α-(aminomethyl)acrylate : An amphiphilic monomer for pH- Temperature-responsive Polymers, International symposium on Amphiphilic polymers, networks gels, and membranes (APNGM15)

  6. Precise synthesis of poly(methyl methacrylate): Controls of molecular weight, stereoregularity, and end-Functionality, International Conference on Smart Systems Engineering 2015 (SmaSys 2015) 2015/1/9