25. T. Higashihara,* T. Mikata, H. Sun, C.-C. Chueh, “Recent Progress in Semiconducting Block Copolymers Suited for Organic Photovoltaics”, Chem. Lett., 55(6), upag104 (2026). https://doi.org/10.1093/chemle/upag104

24. T. Higashihara,* K. Yokawa, “Synthesis of Imide–based Semiconducting Polymers by Nonstoichiometric Step–growth Polycondensation via Intramolecular Catalyst–transfer System”, J. Photopolym. Sci. Technol., 38(2), 111–116 (2025). https://doi.org/10.2494/photopolymer.38.111

23. K. Yokawa, T. Higashihara,* “Recent Progress in Nonstoichiometric Step–growth Polymerization”, Polym. Chem., 16(1), 11–16 (2025).
https://doi.org/10.1039/D4PY01091D

22. M. Matsuda, K. Sato, K. Terayama, Y. Ochiai, K. Enomoto, T. Higashihara,* “Synthesis of Electron Deficient Semiconducting Polymers Suitable as Intrinsically Stretchable n–Type Semiconducting Materials”, Polym. J., 55(4), 365–373 (2023). https://doi.org/10.1038/s41428–022–00729–6

21. T. Higashihara,* “Strategic Design and Synthesis of π–Conjugated Polymers Suitable as Intrinsically Stretchable Semiconducting Materials”, Polym. J., 53, 1061–1071 (2021). https://doi.org/10.1038/s41428–021–00510–1

20. M.–C. Fu, T. Higashihara, M. Ueda,* ”Recent Progress in Thermally Stable and Photosensitive Polymers”, Polym. J., 50(1), 57–76 (2018). https://doi.org/10.1038/pj.2017.46

19. R. Goseki,* S. Ito, Y. Matsuo, T. Higashihara, A. Hirao,* “Precise Synthesis of Macromolecular Architectures by Novel Iterative Methodology Combining Living Anionic Polymerization with Specially Designed Linking Chemistry”, Polymers, 9(10), 470 (2017). https://doi.org/10.3390/polym9100470

18. T. Higashihara,* “Precise Synthesis of Block and Miktoarm Star–branched Polymers Containing Polythiophene Segments with Low Dispersity by Combination of Living Anionic Polymerization and Catalyst–transfer Polycondensation Systems”, Macromol. Chem. Phys., 218(12), 1600434 (2016). https://doi.org/10.1002/macp.201600434

17. T. Higashihara, M. Ueda,* “Recent Progress in High Refractive Index Polymers”, Macromolecules, 48(7), 1915–1929 (2015). (Front Cover) https://doi.org/10.1021/ma502569r

16. X. Zhang, T. Higashihara, M. Ueda,* L. Wang,* “Polyphenylenes and the Related Copolymer Membranes for Electrochemical Device Applications”, Polym. Chem., 5(21), 6121–6141 (2014). (Back cover) https://doi.org/10.1039/C4PY00898G

15. T. Higashihara,* E. Goto, “Controlled Synthesis of Low–polydisperse Regioregular Poly(3–hexylthiophene) and Related Materials by Zincate–complex Metathesis Polymerization”, Polym. J., 46(7), 381–390 (2014). https://doi.org/10.1038/pj.2014.14

14. J. Wang, T. Higashihara,* “Synthesis of All–conjugated Donor–acceptor Block Copolymers and Their Application in All–polymer Solar Cells”, Polym. Chem., 4(22), 5518–5526 (2013). (Back Cover) https://doi.org/10.1039/C3PY00979C

13. T. Higashihara,* M. Ueda, “Precision Synthesis of Tailor–made Polythiophene–based Materials and Their Application to Organic Solar Cells”, Macromol. Res., 21(3), 257–271 (2013). https://doi.org/10.1007/s13233–013–1123–5

12. Y. Segawa, T. Higashihara, M. Ueda,* “Synthesis of Hyperbranched Polymers with Controlled Structure”, Polym. Chem., 4(6), 1746–1759 (2013). https://doi.org/10.1039/C2PY20877F

11. T. Kurosawa, T. Higashihara, M. Ueda,* “Polyimide Memory: A Pith Guideline for Future Applications”, Polym. Chem., 4(1), 16–30 (2013). https://doi.org/10.1039/C2PY20632C

10. T. Higashihara, Y. Shibasaki, M. Ueda,* “Development of Thermally Stable and Photosensitive Polymers”, J. Photopolym. Sci. Technol., 25(1), 9–16 (2012). https://doi.org/10.2494/photopolymer.25.9

9. T. Higashihara,* Y. Saito, K. Mizoguchi, M. Ueda,* “Recent Progress in Negative–working Photosensitive and Thermally Stable Polymers”, React. Funct. Polym., 73(2), 303–315 (2012). https://doi.org/10.1016/j.reactfunctpolym.2012.04.020

8. T. Higashihara,* Y. Segawa, W. Sinananwanich, M. Ueda, “Synthesis of Hyperbranched Polymers with Controlled Degree of Branching”, Polym. J., 44(1), 14–29 (2012). https://doi.org/10.1038/pj.2011.99

7. T. Higashihara,* M. Hayashi, A. Hirao,* “Synthesis of Well–defined Star–branched Polymers by Stepwise Iterative Methodology Using Living Anionic Polymerization”, Prog. Polym. Sci., 36(3), 323–375 (2011). https://doi.org/10.1016/j.progpolymsci.2010.08.001

6. T. Higashihara,* K. Sugiyama, H.–S. Yoo, M. Hayashi, A. Hirao,* “Combining Living Anionic Polymerization with Branching Reactions in an Iterative Fashion to Design Branched Polymers”. Macromol. Rapid Commun., 31(12), 1031–1059 (2010). https://doi.org/10.1002/marc.200900773

5. K. Sugiyama,* K. Inoue, T. Higashihara, H. Hayashi, A. Hirao, “Synthesis of Well–defined Block Copolymers and Star–branched Polymers by Using Terminal 1,3–Butadiene Functionalized Polymers as Reactive Building Blocks”, React. Funct. Polym., 69(7), 480–492 (2009). https://doi.org/10.1016/j.reactfunctpolym.2008.12.020

4. T. Higashihara, K. Matsumoto, M. Ueda,* “Sulfonated Aromatic Hydrocarbon Polymers as Proton Exchange Membranes for Fuel Cells”, Polymer, 50(23), 5341–5357 (2009). https://doi.org/10.1016/j.polymer.2009.09.001

3. A. Hirao*, K. Inoue, T. Higashihara, M. Hayashi, “Successive Synthesis of Well–defined Star–branched Polymers by Iterative Methodology Based on Living Anionic Polymerization”, Polym. J., 40(10), 923–941 (2008). https://doi.org/10.1295/polymj.PJ2008064

2. A. Hirao,* M. Hayashi, S. Loykulnant, K. Sugiyama, S.W. Ryu, N. Haraguchi, A. Matsuo, T. Higashihara, “Syntheses of Chain–multi–functionalized Polymers, Star–branched Polymers, Star–linear Block Polymers, Densely Branched Polymers, and Dendritic Branched Polymers Based on Iterative Approach Using Functionalized 1,1–Diphenylethylene Derivatives”, Prog. Polym. Sci., 30(2), 111–182 (2005). https://doi.org/10.1016/j.progpolymsci.2004.12.002

1. A. Hirao,* M. Hayashi, Y. Tokuda, T. Higashihara, N. Haraguchi, S.W. Ryu, “Precise Synthesis of Regular and Asymmetric Star–branched Polymers and Densely Branched Polymers by Means of Living Anionic Polymerization”, Polym. J., 34(9), 633–658 (2002). https://doi.org/10.1295/polymj.34.633