Original papers


  1. R. Cho, H. Kamata, Y. Tsuji, A. Fujisawa, Y. Miura, S. Ishikawa, R. Sato, T. Katashima, T. Sakai, M. Fujishiro, “Optimizing self-solidifying hydrogels as an endoscopically deliverable hydrogel coating system: A proof-of-concept study in porcine endoscopic submucosal dissection-induced ulcers” Polymer Journal, accepted.
  2. R. Kobayashi, M. Naito, K. Miyata, T. Sakai, U. Chung, T. Katashima*, “Prediction of degradation effects on viscoelastic relaxation time using model transient networks” Polymer Journal, published online.
  3. R. Kobayashi, M. Naito, K. Miyata, T. Sakai, U. Chung, T. Katashima*, “Prediction of degradation effects on viscoelastic relaxation time using model transient networks” Polymer Journal, Accepted. K. Tsuchiya, K. Terada, Y. Tsuji, S. Law, H. Masunaga, T. Katashima, T. Sakai, K. Numata, “Cross-linking polybutadiene rubber via a thiol-ene reaction with polycysteine as a degradable cross-linker” Polymer Journal, 56, 391-400 (2024)


  4. S. Ishikawa, Y. Iwanaga, T. Uneyama, X. Li, H. Hojo, I. Fujinaga, T. Katashima, T. Saito, Y. Okada, U. Chung, N. Sakumichi and T. Sakai, “Percolation-induced gel–gel phase separation in a dilute polymer network” Nature Materials, 22, 1564-1570 (2023)
  5. M. Kato, S. Ishikawa, Q. Shen, Z. Du, T. Katashima, M., T. Numahata, M. Okazaki, T. Sakai, M. Kurita, “In situ-formable, dynamic crosslinked poly(ethylene glycol) carrier for localized adeno-associated virus infection and reduced off-target effects” Communication Biology, 6: 508 (2023)
  6. S. Ishikawa, M. Kato, J. Si, L. Chenyu, K. Kimura, T. Katashima, M. Naito, M. Kurita, T. Sakai, “Molecular Weight-Dependent Diffusion, Biodistribution, and Clearance Behavior of Tetra-Armed Poly(ethylene glycol) Subcutaneously Injected into the Back of Mice” ACS Macro Letters, 12(4) 510-517 (2023)

  7. T. Katashima*, R. Kobayashi, S. Ishikawa, M. Naito, K. Miyata, U. Chung, T. Sakai, “Decoupling between Translational Diffusion and Viscoelasticity in Transient Networks with controlled network connectivity” Gels, 8 (12), 830 (2022)
  8. T. Katashima*, R. Kudo, R. Onishi, M. Naito, S. Nagatoishi, K. Miyata, K. Tsumoto, U. Chung, T. Sakai, “Effects of Network Connectivity on Viscoelastic Relaxation in Transient Networks using Experimental Approach” Frontiers in Soft Matter, 2:1059156(2022)
  9. T. Murakami, S. Hoshi, F. Okamoto, T. Sakai, T. Katashima, M. Naito, T. Oshika, “Analysis of the sustained release ability of bevacizumab-loaded tetra-PEG gel” Experimental Eye Research, 223 109206 (2022)
  10. T. Katashima*, R. Kudo, M. Naito, S. Nagatoishi, K. Miyata, U. Chung, K. Tsumoto, T. Sakai, ” Experimental Comparison of Bond Lifetime and Viscoelastic Relaxation in Transient Networks with Well-Controlled Structures” ACS Macro Letters, 11 753-759 (2022)
  11. J. Tang, T. Katashima*, C.I. Gupit, X. Li, Y. Mitsukami, Y. Yokoyama, N. Sakumichi, U. Chung, T. Sakai, “Non-swellability of polyelectrolyte gel in divalent salt solution due to aggregation formation” Polymer, 124894 (2022)
  12. T. Fujiyabu, N. Sakumichi, T. Katashima, C. Liu, K. Mayumi, U. Chung, T. Sakai, “Tri-branched gels: Low branching factors make rubbery materials ultra-elastic” Science Advances, 8(14) (2022)
  13. M. Ohira, T. Katashima, M. Naito, D. Aoki, Y. Yoshikawa, H. Iwase, S. Takata, K. Miyata, U. Chung, T. Sakai, M. Shibayama, X. Li, “Star-Polymer-DNA Gels Showing Highly Predictable and Tunable Mechanical Responses” Advanced Materials, e2108818 (2022)

  14. T. Fujiyabu, T. Sakai, R. Kudo, Y. Yoshikawa, T. Katashima, U. Chung, N. Sakumichi, “Temperature Dependence of Polymer Network Diffusion” PHYSICAL REVIEW LETTERS 127, 23 (2021)
  15. J. Tang, T. Katashima*, X. Li, Y. Mitsukami, Y. Yokoyama, U. Chung, M. Shibayama, T. Sakai “Effect of Nonlinear Elasticity on the Swelling Behaviors of Highly Swollen Polyelectrolyte Gels” Gels, 7 (1), 25 (2021)

  16. S. Konishi, Y. Kashiwagi, G. Watanabe, M. Osaki, T. Katashima, O. Urakawa, T. Inoue, H. Yamaguchi, A. Harada, Y. Takashima “Design and mechanical properties of supramolecular polymeric materials based on host-guest interactions: the relation between relaxation time and fracture energy” Polymer Chemistry, 11 (42) 6811-6820 (2020)
  17. J. Tang, T. Katashima*, X. Li, Y. Mitsukami, Y. Yokoyama, N. Sakumichi, U. Chung, M. Shibayama, T. Sakai “Swelling Behaviors of Hydrogels with Alternating Neutral/Highly Charged Sequences” Macromolecules 53, 19 (2020)
  18. A. D. Malay, T. Suzuki, T. Katashima, N. Kono, K. Arakawa, K. Numata “Spider silk self-assembly via modular liquid-liquid phase separation and nanofibrillation” Science Advances, 6 (45) (2020)
  19. T. Katashima, R. Kagami, U. Chung, T. Sakai “Similarity in linear viscoelastic behaviors of network formation and degradation processes” Nihon Reoroji Gakkaishi 48 (4) (2020)
  20. J. Kim, T. Fujiyabu, N. Sakumichi, T. Katashima, Y. Yoshikawa, U. Chung, T. Sakai “Mixing and Elastic Contributions to the Diffusion Coefficient of Polymer Networks” Macromolecules 53, 18, 7717-7725 (2020)
  21. I. Fujinaga, T. Yasuda, M. Asai, U. Chung, T. Katashima, T. Sakai “Cluster growth in percolation process from diluted system” Polymer Journal 52 (3) 289-297 (2020)
  22. H. Sogawa, T. Katashima, K. Numata “A covalently crosslinked silk fibroin hydrogel using enzymatic oxidation and chemoenzymatically synthesized copolypeptide crosslinkers consisting of a GPG tripeptide motif and tyrosine: control of gelation and resilience” Polymer Chemistry 11 (18), 3152-3161 (2020)
  23. T. Chiba, T. Katashima, O. Urakawa, T. Inoue “Rheological Test for the Homogeneity of Aqueous Blends of Associative Polymer Network and Entangled Linear Polymer” Nihon Reoroji Gakkaishi, 48(1) 49-54 (2020)

  24. C. J. Love, B. A. Serban, T. Katashima, K. Numata, M. A. Serban “Mechanistic insights into silk fibroin’s adhesive properties via chemical functionalization of serine side chains” ACS Biomaterials Science & Engineering, 5, 11, 5960-5967 (2019)
  25. M. Ohnishi, T. Katashima*, M. Nakahata, O. Urakawa “Relationships between Diffusion and Viscoelasticity of Associative Polymer Networks” Nihon Reoroji Gakkaishi, 47 (4) 133-142 (2019)
  26. Y. Kashiwagi, T. Katashima, Y. Takashima, A. Harada, T. Inoue “Effect of Host-Guest Interaction on Swelling Behavior and Equilibrium Swollen State of Host-Guest Gel” Nihon Reoroji Gakkaishi, 47 (3), 99-104 (2019)
  27. T. Katashima*, U. Chung, and T. Sakai “Mechanical Properties of Doubly Crosslinked Gels” Polymer Journal, 3, 1-9 (2019)
  28. T. Katashima*, H. Sakurai, U. Chung, and T. Sakai “Dilution effect on the cluster growth near the gelation threshold” Nihon Reoroji Gakkaishi, 47, (2), 61-66 (2019)

  29. Y. Okada, Y. Goto, R. Tanaka, T. Katashima, X. Jiang, K. Terao, T. Sato, and T. Inoue “Viscoelastic Properties of Tightly Entangled Semiflexible Polymer Solutions” Macromolecules, 51 (23), pp 9626–9634 (2018)
  30. Y. Kashiwagi, T. Katashima, M. Nakahata, Y. Takashima, A. Harada, and T. Inoue “Linear Viscoelastic Studies on a Transient Network Formed by Host-Guest Interaction.” Journal of Polymer Science Part B: Polymer Physics, 56, 1109-1117 (2018)

  31. T. Inoue, Y. Narihisa, T. Katashima, S. Kawasaki, and T. Tada “A Rheo-Optical Study on Reinforcement Effect of Silica Particle Filled Rubber” Macromolecules, 50, 20, 8072-8082, (2017)
  32. K. Hayashi, F. Okamoto, S. Hoshi, T. Katashima, D. Zujur, X. Li, M. Shibayama, E. P. Gilbert, U. Chung, S. Ohba, T. Oshika, and T. Sakai “Fast-forming hydrogel with ultralow polymeric content as an artificial vitreous body” Nature Biomedical Engineering, 1, 0044 (2017)

  33. 山﨑香奈,片島拓弥*,井上正志,中村綾野,那須昭夫 「マイクロゲル・高分子混合系のレオロジー」 高分子論文集,73, 6, 532-538 (2016)
  34. T. Sakai, T. Katashima, T. Matsushita, and U. Chung “Sol-gel transition behavior near critical concentration and connectivity” Polymer Journal, 48, 629-634 (2016)

  35. T. Katashima, U. Chung, and T. Sakai, “Effect of swelling and deswelling on mechanical properties of polymer gels” Macromolecular Symposia, 358, 128-139 (2015)
  36. M. Asai, T. Katashima, T. Sakai, and M. Shibayama “Supercoiling Transformation of Chemical Gels” Soft Matter, 11, 7101-7108 (2015)
  37. T. Katashima, K. Urayama, U. Chung, and T. Sakai, “Probing the cross-effect of strains in non-linear elasticity of nearly regular polymer networks by pure shear deformation” Journal of Chemical Physics, 142, 174908, (2015)

  38. T. Katashima, M. Asai, K. Urayama, U. Chung, and T. Sakai, “Mechanical properties of tetra-PEG gels with supercoiled network structure” Journal of Chemical Physics, (140), 074902, (2014)
  39. K. Numata, S. Yamazaki, T. Katashima, J. Chuah, N. Naga, and T. Sakai, “Silk-Pectin Hydrogel with Superior Mechanical Properties, Biodegradability, and Biocompatibility” Macromolecular Bioscience, (14), 6, 799-806 (2014)

  40. M. Asai, T. Katashima, T. Sakai, U. Chung, and M. Shibayama “Correlation between local and global inhomogeneities of chemical gels” Macromolecules, (46), 24, 9772-9781 (2013)

  41. Y. Akagi, T. Katashima, H. Sakurai, U. Chung, and T. Sakai “Ultimate elongation of polymer gels with controlled network structure” RSC Advances, 3, (32), 13251-13258. (2013)


  42. T. Katashima, K. Urayama, U. Chung, and T. Sakai “Strain energy density function of near-ideal polymer network estimated by biaxial deformation of Tetra-PEG gel” Soft Matter, 8, 8217-8222 (2012)


  43. Y. Akagi, T. Katashima (Co-first), Y. Katsumoto, K. Fujii, T. Matsunaga, U. Chung M. Shibayama, and T. Sakai, “Examination of the theories of rubber elasticity using an ideal polymer network” Macromolecules, 44, 5817-5821 (2011)
  44. K. Numata, T. Katashima, and T. Sakai, “State of Water, Molecular Structure, and Cytotoxicity of Silk Hydrogels” Biomacromolecules, 12, 2137-2144 (2011)


  45. M. Kurakazu, T. Katashima (Co-first), M. Chijiishi, K. Nishi, Y. Akagi, T. Matsunaga, M. Shibayama, U. Chung, and T. Sakai, “Evaluation of gelation kinetics of Tetra-PEG gel” Macromolecules, 43, 3935-3940 (2010)

Review papers

  1. S.Michida, U. Chung, T. Katashima*, “Probing the Molecular Mechanism of Viscoelastic Relaxation in Transient Networks”
    Gels, 9(12), 945 (2023)
  2. T. Katashima*, “Precise rheological analysis of permanently and transiently crosslinked polymer networks with well-controlled structures”
    Nihon Reoroji Gakkaishi, accepted (Award Lecture Article)
  3. T. Katashima*, “Molecular Understanding of Viscoelasticity in Transient Polymer Networks Based on Multiple Methods”
    Nihon Reoroji Gakkaishi, 50, 51-56 (2022) (Invited Review)
  4. T. Katashima*, “Rheological studies on polymer networks with static and dynamic crosslinks”
    Polymer Journal, 53, 1073–1082 (2021) (Invited Review)
  5. T. Katashima, A. Malay (co-first), and K. Numata, “Chemical modification and biosynthesis of silk-like polymers”
    Current Opinion in Chemical Engineering, 24, 61-68 (2019)
  6. 片島拓弥、酒井崇匡、「均一網目構造を用いた高分子ゲルの弾性と構造の相関の研究」
    ネットワークポリマー, (37), 2, 73-80 (2016) 
  7. 片島拓弥、倉員麻奈美、赤木友紀、鄭雄一、酒井崇匡、「高分子ゲルにおける調製時および測定時高分子体積分率と力学特性の関係」
    日本レオロジー学会誌, (42), 2, 97-102 (2014) 

Books and Chapters

  1. 技術情報協会編、「動的粘弾性測定とそのデータ解釈事例」
    技術情報協会 (一部分担4-1章) (2021年)
  2. Takamasa Sakai “Physics of Polymer Gels”
    Wiley‐VCH Verlag GmbH & Co. KGaA (2020) (一部分担)
  3. 高分子学会編、「基礎高分子化学 第2版」
    東京化学同人 (一部分担8-2章) (2020年)
  4. 酒井崇匡、赤木友紀、片島拓弥、Xiang Li「高分子ゲルの物理学」

Invited Talks