Importance of reversible reaction for the selective synthesis of telechelic polymer by means of polycondensation

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01989
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 35010:Polymer chemistry-related
• Research Institution: Kanagawa University
• Principal Investigator: Yokozawa Tsutomu 神奈川大学, 化学生命学部, 教授 (80182690)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 重縮合 / テレケリックポリマー / 可逆反応 / 平衡重合 / 末端官能基化 / ポリエステル / ポリカーボネート / ポリエーテルスルホン

Outline of Final Research Achievements

Quantitative end-functionalization in the polycondensation of difunctional nucleophilic monomer and difunctional electrophilic monomer (A2 + B2 polycondensation) is not necessarily easy, because the polymer ends A and B undergo cyclization in competition with propagation even when any of the two monomers is used in excess. In this research, we investigated a simpler approach to end-functionalized polymer by means of unstoichiometric reversible polycondensation of two monomers. The use of an excess of one monomer resulted in the formation of linear polymer end-capped with the excess monomer at both ends without formation of cyclic polymer. Furthermore, the reversible polycondensation of equimolar monomers in the presence of a small molecule, having the same functional group as that of the main chain, afforded a variety of telechelic polymers with the functional groups derived from the small molecule at both ends.

Free Research Field

高分子合成化学

Academic Significance and Societal Importance of the Research Achievements

重縮合において環状ポリマーを含まずに選択的にテレケリックポリマーを合成するための手法を開発するという問題提起がこれまで行われていなかった。さらにはこれまで常識的に良く行われていた、どちらかのモノマーを過剰に用いる重縮合において不可逆反応を用いると環状ポリマーが混ざるが、可逆反応にすれば選択的にテレケリックポリマーが生成するという可逆反応の重要性を明らかにした。この手法によって純度の高いテレケリックポリマーを社会に提供できるようになった。