Publications

Block copolymer

  1. Y. Shiraki, K. Ito, H. Yokoyama, "Direct observation of the fracture mechanism at polyurethane/polyolefin adhesive interfaces involving needle-like polyolefin crystals", Polymer, 308, 127380 (2024).
  2. Y. Shiraki, N. L. Yamada, K. Ito, H. Yokoyama, "Adhesion to untreated polyethylene by diffusion: Effect of polyurethane adhesive molecular weight on polyethylene penetration", Polymer, 302, 127061 (2024).
  3. M. Saito, N. L. Yamada, K. Ito, and H. Yokoyama, "Mechanical Properties and Swelling Behaviors of Ultrathin Chemically Cross-Linked Polybutadiene Films", Macromolecules, 56, 4000−4011 (2023).
  4. M. Saito, K. Ito, and H. Yokoyama, "Negative interfacial energies of dynamic polymer brush interfaces: a discussion of the free energy balance", Polymer Journal, 55, 897–902 (2023).
  5. Y. Shiraki, M. Saito, N. L. Yamada, K. Ito, and Hideaki Yokoyama, "Adhesion to Untreated Polyethylene and Polypropylene by Needle-like Polyolefin Crystals", Macromolecules, 56, 2429−2436 (2023).
  6. M. Saito, K. Ito, H. Yokoyama, "Film thickness and strain rate dependences of the mechanical properties of polystyrene-b-polyisoprene-b-polystyrene block copolymer ultrathin films forming a spherical domain", Polymer, 258, 125302(2022).
  7. M. Saito, K. Ito, H. Yokoyama, "Mechanical Properties of Ultrathin Polystyrene-b-Polybutadiene-b-Polystyrene Block Copolymer Films: Film Thickness-Dependent Young’s Modulus", Macromolecules, 54(18), 8538-8547(2021).
  8. Y. Shiraki, H. Yokoyama, "Novel Hydrophobic and Oleophobic Surfaces Using Polyurethane with Hydrogenated Polyisoprene Soft Segment", Mater. Today Commun., 24, 101243(2020).
  9. M. Saito, N. L. Yamada, K. Ito, H. Yokoyama, "Interfacial Energy Measurement on the Reconstructive Polymer Surface: Dynamic Polymer Brush by Segregation of Amphiphilic Block Copolymers", Langmuir, 36(23), 6465–6472(2020).
  10. T. Aoki, K. Ito, H. Yokoyama, "Adhesion Force Analysis of Dynamic Polymer Brushes", Langmuir, 36(22), 6210–6215(2020).
  11. R. Goseki, S. Miyao, S. Uchida, H. Yokoyama, K. Ito, T. Ishizone, "Surface Characterization of Amphiphilic Block Copolymers Possessing Polyisoprene and Poly[Tri(Ethylene Glycol) Methacrylate] Segments and the Effect of Side Chain ω-Function on Surface Energy", Polymer, 190(), 122257(2020).
  12. H. Tanoue, K. Inoue, N. L. Yamada, K. Ito, S. Miyao, T. Ishizone, H. Yokoyama, "A Thermoresponsive Dynamic Polymer Brush Fabricated by the Segregation of Amphiphilic Diblock Copolymers", Soft Matter, 14(28), 5930–5935(2018).
  13. K. Yanagi, N. L. Yamada, K. Kato, K. Ito, H. Yokoyama, "Polyrotaxane Brushes Dynamically Formed at a Water/Elastomer Interface", Langmuir, 34(18), 5297–5302(2018).
  14. Y. Tang, X. Lin, K. Ito, L. Hong, T. Ishizone, H. Yokoyama, M. Ulbricht, "Tunable Magneto-Responsive Mesoporous Block Copolymer Membranes", J. Memb. Sci., 544, 406–415(2017).
  15. H. Tanoue, M. Inutsuka, N. L. Yamada, K. Ito, H. Yokoyama, "Kinetics of Dynamic Polymer Brush Formation" Macromolecules", Macromolecules, 50(14), 5549–5555(2017).
  16. A. Seki, T. Ishizone, A. Oyane, H. Yokoyama, "A Segregation and Deprotection Approach for Hydrophilic Surfaces Using Amphiphilic Block Copolymers Possessing Polystyrene and Poly[(Tri(Ethylene Glycol) Methacrylate)] Segments", Macromol. Chem. Phys., 218(12), (2017).
  17. H. Tanoue, N. L. Yamada, K. Ito, H. Yokoyama, "Quantitative Analysis of Polymer Brush Formation Kinetics Using Quartz Crystal Microbalance: Viscoelasticity of Polymer Brush", Langmuir, 33(21), 5166–5172(2017).
  18. H. Hasegawa, T. Ohta, K. Ito, H. Yokoyama, "Stress-Strain Measurement of Ultra-Thin Polystyrene Films: Film Thickness and Molecular Weight Dependence of Crazing Stress", Polymer, 123(11), 179-183(2017).
  19. M. Inutsuka, H. Tanoue, N. L. Yamada, K. Ito and H. Yokoyama, “Dynamic contact angle on a reconstructive polymer surface by segregation”RSC Adv., 7, 17202-17207 (2017).
  20. S. Takahashi, N. L. Yamada, K. Ito, H. Yokoyama, "Inclusion Complex of α-Cyclodextrin with Poly(ethylene glycol) Brush", Macromolecules, 49(18), 6947-6952(2016).
  21. T. Shinkai, K. Sugiyama, K. Ito, H. Yokoyama, “Nanoporous fabrication of block copolymers via carbon dioxide swelling: Difference between CO2-swollen and nanoporous block copolymers” Polymer, 100, 19–27 (2016).
  22. Y. Tang, K. Ito, L. Hong, T. Ishizone, H. Yokoyama*, "Tunable Thermoresponsive Mesoporous Block Copolymer Membranes" Macromolecules, 49(20) , 7886-7896 (2016).
  23. T. Shinkai, K. Sugiyama, K. Ito, H. Yokoyama*, "Nanoporous fabrication of block copolymers via carbon dioxide swelling: Difference between CO2-swollen and nanoporous block copolymers" Polymer, 100 , 19-27 (2016).
  24. C. Dutriez, K. Satoh, M. Kamigaito, H. Yokoyama*, "Cross-linked nanocellular polymer films: water-and oil-repellent anti-reflection coating." Polymer Journal, 48 , 497-501 (2016).
  25. R. Ishige, T. Higuchi, X. Jiang, K. Mita, H. Ogawa, H. Yokoyama, H. Jinnai*, "Structural Analysis of Microphase Separated Interface in an ABC-Type Triblock Terpolymer by Combining Methods of Synchrotron-Radiation Grazing Incidence Small-Angle X-ray Scattering and Electron Microtomography." Macromolecules, 48(8) , 2697-2705 (2015).
  26. M. M. Ito, K. Ito, M. Shibayama, K. Sugiyama, H. Yokoyama*, "Phase Behavior of Block Copolymers in Selective Supercritical Solvent." Macromolecules, 48(11) , 3590-3597 (2015).
  27. T. Shinkai, M. Ito, K. Sugiyama, K. Ito, H. Yokoyama*, "Retrograde order-disorder transition of a semi-fluorinated block copolymer induced by supercritical carbon dioxide" Soft Matter, 9 , 10689-10693 (2013).
  28. M. Inutsuka, NL. Yamada, K. Ito, H. Yokoyama*, "High Density Polymer Brush Spontaneously Formed by the Segregation of Amphiphilic Diblock Copolymers to the Polymer/Water Interface" ACS Macro Letters, 2 , 265-268 (2013).
  29. H. Yokoyama*, "Small angle X-ray scattering studies of nanocellular and nanoporous structures" Polymer Journal, 45 , 3-9 (2013).
  30. T. Shinkai, M. Ito, K. Sugiyama, K. Ito, H. Yokoyama*, " Ordered and foam structures of semifluorinated block copolymers in supercritical carbon dioxide" Soft Matter, 8 , 5811-5817 (2012).
  31. C. Dutriez, K. Satoh, M. Kamigaito, H. Yokoyama*, "Nanocellular foaming of fluorine containing block copolymers in carbon dioxide: the role of glass transition in carbon dioxide", RSC Advances, 2 , 2821-2827 (2012).
  32. R. Zhang, C. Dutriez, K. Sugiyama, T. Ishizone, H. Yokoyama*, "Thermally robust nanocellular thin films of high-T-g semifluorinated block copolymers foamed with supercritical carbon dioxide", Soft Matter, 7, 4032-4038 (2011).
  33. J. Yamanaka, T. Kayasuga, M. Ito, H. Yokoyama, T. Ishizone*, "Synthesis of water-soluble poly[oligo(ethylene glycol) methacrylate]s by living anionic polymerization of oligo(ethylene glycol) vinyl ether methacrylates", Polymer Chemistry, 2 , 1837-1848 (2011).
  34. H. Yokoyama*, L. Li, C. Dutriez, Y. Iwakura, K. Sugiyama, H. Masunaga, S. Sasaki, H. Okuda, "Fabrication of Nanoporous Structures in Block Copolymer Using Selective Solvent Assisted with Compressed Carbon Dioxide", Macromolecules, 42 ,3559-3564 (2009).
  35. H. Yokoyama*, L. Li, C. Dutriez, Y. Iwakura, K. Sugiyama, H. Masunaga, S. Sasaki, H. Okuda, "Horizontally and vertically aligned polymeric nanosheets: CO2-induced morphological transition of block copolymer templates", Macromolecules, 41 ,8626-8631 (2008).
  36. T. Oka, C. He, K. Ito, C. Dutriez, H. Yokoyama, Y. Kobayashi, "Free Volume Expansion and Nanofoaming of Supercritical Carbon Dioxide Treated Polystyrene", J. Phys. Chem. 112, 12191-12194 (2008).
  37. T. Ishizone, A. Seki, M. Hagiwara, S. Han, H. Yokoyama, A. Oyane, A. Deffieux, S. Carlotti "Anionic Polymerizations of Oligo(ethylene glycol) Alkyl Ether Methacrylates: Effect of Side Chain Length and w-Alkyl Group of Side Chain on Cloud Point in Water", Macromolecules, 41, 2963-2967 (2008).
  38. R. Zhang, A. Seki, T. Ishizone, and H Yokoyama* "Reduced Hydrophobic Interaction of Polystyrene Surfaces by Spontaneous Segregation of Block Copolymers with Oligo (Ethylene Glycol) Methyl Ether Methacrylate Blocks: Force Measurements in Water Using Atomic Force Microscope with Hydrophobic Probes", Langmuir, 24, 5527-5533, (2008).
  39. C. Dutriez, K. Sato, M. Kamigaito, and H. Yokoyama*, "Nanometer Voids Prevent Crack Growth in Polymeric Materials", Macromolecules, 40, 7433-7436 (2007).
  40. H. Yokoyama*, C. Dutriez, L. Li, T. Nemoto, K. Sugiyama, S. Sasaki, H. Masunaga, M. Takata and H. Okuda "Grazing Incident Small Angle X-ray Scattering Study of Polymer Thin Films with Embedded Ordered Nanometer Cells" J. Chem. Phys., 127, 014904 (2007).
  41. L. Li, H. Yokoyama*, "Nanoscale Silica Capsules Ordered on a Substrate: Oxidation of Nanocellular Thin Films of Poly(styrene-b-dimethylsiloxane)" Angew. Chem. Int. Ed., 45, 6338-6341 (2006).
  42. T. Miyamae, H. Yokoyama, S. Han, T. Ishizone, "Surface Characterization of Block Copolymers with Water-soluble Block by using Sum-Frequency Generation Spectroscopy" e-Journal of Surface Science and Nanotechnology, 4, 515-520 (2006).
  43. L. Li, T. Nemoto, K. Sugiyama and H. Yokoyama*, "CO2 foaming in thin films of block copolymer containing fluorinated blocks" Macromolecules, 39, 4746-4755 (2006).
  44. T. Hayakawa, M. Seino, R. Goseki, T. Hirai, R. Kikuchi, M. Kakimoto, H. Yokoyama and S. Horiuchi, "Fabrication of Hierarchical Ordered Hybrid Structures over Multiple Length Scales: Self-Organizing Polyhedral Oligomeric Silsesquioxane (POSS) Functionalized Block Copolymer Templates" Polym. J., 38, 567-576 (2006).
  45. T. Hayakawa, T. Kouketsu, M. Kakimoto, H. Yokoyama and S. Horiuchi, "Patterned Surfaces in Self-Organized Block Copolymer Films with Hexagonally Ordered Microporous Structures" Macromolecular Research, 14, 52-58 (2006).
  46. T. Ishizone, S. Han, M. Hagiwara and H. Yokoyama*, "Synthesis and Surface Characterization of Well-Defined Amphiphilic Block Copolymers containing Poly[oligo(ethylene glycol) methacrylate] Segments", Macromolecules, 39, 962-970 (2006).
  47. A. A. El-Shehawy, H. Yokoyama, K. Sugiyama, and A. Hirao, "Precise Synthesis of Novel Chain-End-Functionalized Polystyrenes with a Definite Number of Perfluorooctyl Groups and Their Surface Characterization", Macromolecules, 38, 8285-8299 (2005).
  48. L. Li, H. Yokoyama*, "Aligning Single-Layer Cylinders of Block Copolymer Nanodomains using Soft Molding" Adv. Mater., 17, 1432-1436 (2005).
  49. T. Hayakawa and H. Yokoyama* "Chemically Heterogeneous Surface on Self-Organized Microporous Films" Langmuir, 21, 10288-10291 (2005).
  50. A. Oyane, T. Ishizone, M. Uchida, K. Furukawa,T. Ushida and H. Yokoyama*, "Spontaneously formed blood compatible surfaces on hydrophobic polymers: surface enrichment of a block copolymer with a water-soluble block" Adv. Mater. 17, 2329 (2005).
  51. H. Yokoyama* and K. Sugiyama, "Nanocellular structures in block copolymers with CO2-philic blocks using CO2 as a blowing agent: Crossover from micro- to nano-cellular structures with depressurization temperature", Macromolecules; 38, 10516-10522 (2005).
  52. H. Yokoyama*, T. Miyamae, S. Han, T. Ishizone, K. Tanaka, A. Takahara, and N. Torikai, "Surface Segregation of Block Copolymers with a Water-Soluble Block", Macromolecules, 38, 5180-5189 (2005).
  53. H. Yokoyama*, L. Li, T. Nemoto, K. Sugiyama, "Effects of Saturation Pressure of CO2 on Nanofoams nucleated from Block copolymer Nanodomains" Trans. MRS-J., 30, 627-630 (2005).
  54. L. Li, H. Yokoyama*, K. Sugiyama, T. Nemoto, "Facile Fabrication of Nanocellular Block Copolymer Thin Films using Supercritical Carbon Dioxide", Adv. Mater., 16, 1226-1229 (2004).
  55. H. Yokoyama* and K. Sugiyama, "Surface Hydrophobicity of Fluorinated Block Copolymers Enhanced by Supercritical Carbon Dioxide Annealing", Langmuir, 20, 10001-10006 (2004).
  56. H. Yokoyama*, L. Li, K. Sugiyama, T. Nemoto, "Tunable Nanocellular Polymeric Monoliths using Fluorinated Block Copolymer Templates and Supercritical Carbon dioxide", Adv. Mater., 16, 1542-1546 (2004).
  57. H. Yokoyama*, K. Tanaka, A. Takahara, T. Kajiyama, K. Sugiyama and A. Hirao, "Surface Segregation of Fluoroalkyl Side Group of Fluorinated Block Copolymers", Trans. MRS-J., 29, 279-282 (2004).
  58. H. Yokoyama*, K. Tanaka, A. Takahara, T. Kajiyama, K. Sugiyama and A. Hirao, "Surface Structure of Asymmetric Fluorinated Block Copolymers", Macromolecules, 37, 939-945 (2004).
  59. R. A. Segalman, H. Yokoyama and E. J. Kramer, "Graphoepitaxy of Spherical Domain Block Copolymer Films", Adv. Mater., 13, 1152-1155 (2001).
  60. H. Yokoyama and E. J. Kramer, "Diffusion of Triblock Copolymers in a Spherical Domain Structure", Macromolecules, 33, 954 (2000).
  61. H. Yokoyama, T. E. Mates, and E. J. Kramer, "Structure of Asymmetric Diblock Copolymers in Thin Films", Macromolecules, 33, 1888 (2000).
  62. H. Yokoyama, E. J. Kramer and G. H. Fredrickson, "Simulation of Diffusion of Asymmetric Diblock and Triblock Copolymers in a Spherical Domain Structure", Macromolecules, 33, 2249-2257 (2000).
  63. H. Yokoyama and E. J. Kramer, "Mutual Diffusion of Asymmetric Block Copolymers with Homopolymers", Macromolecules, 33, 1871 (2000).
  64. H. Yokoyama, E. J. Kramer, D. A. Hajduk and F. S. Bates, "Diffusion in Mixtures of Asymmetric Diblock Copolymers with Homopolymers", Macromolecules, 32, 3353 (1999).
  65. H. Yokoyama, E. J. Kramer, M. H. Rafailovich, J. Sokolov and S. A. Schwarz, "Structure and Diffusion of Asymmetric Diblock Copolymers in Thin Films: A Dynamic Secondary Ion Mass Spectrometry Study", Macromolecules, 31, 8826 (1998).
  66. H. Yokoyama and E. J. Kramer, "Self-Diffusion of Asymmetric Diblock Copolymers with a Spherical Domain Structure", Macromolecules, 31, 7871 (1998).
  67. H. Yokoyama, A. Takano, M. Okada, T. Nose, "Phase-diagram of Star-shaped Polystyrene Cyclohexane System: Location of Critical Point and Profile of Coexistence Curve", Polymer, 32, 3218 (1991).

( * : HY is the corresponding author)

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