| Project/Area Number |
17H04879
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Polymer chemistry
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| Research Institution | Osaka University (2019)
Tokyo Institute of Technology (2017-2018) |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥23,530,000 (Direct Cost: ¥18,100,000、Indirect Cost: ¥5,430,000)
Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
Fiscal Year 2017: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
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| Keywords | ラダーポリマー / 高分子反応 / ジアザシクロオクタン / 高分子化学 / 高分子物性 / 高分子構造 / コンフォメーション変化 / 溶液物性 / 熱物性 / ガス吸着特性 / ガス透過性 / 高分子合成 |
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| Outline of Final Research Achievements |
The synthesis of ladder polymers is still a big challenge in polymer chemistry, and in particular, there have been no reports on structurally well-defined ladder polymers with a conformationally flexible main chain. Recently, we have reported the first successful synthesis of conformationally flexible diazacyclooctane (DACO)-containing ladder polymers by a post-polymerization reaction of a rigid Troeger’s base (TB)-containing ladder polymer. The post-polymerization reaction involves sequential N-alkylation and hydrolysis for the TB base unit, resulting in a DACO skeleton that can exhibit a ring-flipping motion. The secondary amine group can readily be functionalized by various acylation or alkylation reagents. Furthermore, reversible switching of the conformational flexibility of the polymer backbone by coordination and elimination of BPh2Cl. In this presentation, we will detail the synthesis, properties and conformational switching of the DACO-containing flexible ladder polymers.
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| Academic Significance and Societal Importance of the Research Achievements |
高分子材料は現代の人類の生活を支える不可欠な物質であり、今後もより高機能な高分子の開発が望まれている。ラダーポリマーは、主鎖に沿って二本以上の化学結合を有するため、優れた熱安定性や力学特性ばかりでなく、制限されたコンフォメーション挙動より、通常のポリマーでは実現できない特異な物性の発現が古くから期待されている。本研究ではこれまで高分子化学分野でこれまで未開拓であった、配座柔軟性と構造対称性を併せ持つ新しいラダーポリマーを世界に先駆けて開発することに成功し、そのユニークな物性を明らかにした。
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