2015 Fiscal Year Annual Research Report
スピロ炭素戦略を用いた立体規則性共役系高分子の創製
| Project/Area Number |
15J05745
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| Research Institution | University of Tsukuba |
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Principal Investigator |
徐 錦嘉 筑波大学, 数理物質科学研究科, 特別研究員(DC2)
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| Project Period (FY) |
2015-04-24 – 2017-03-31
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| Keywords | 立体規則性 / 共役系高分子 / ヘリシティ |
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| Outline of Annual Research Achievements |
This year I have conducted two related research topics to achieve the final goal.
(1) Chirally organized fluorene-based polymers based on spiro-carbon strategy
The introduction of chiral moieties on the backbone of conjugated polymers is widely used to induce helicity to the main chain of conjugated polymers. Based on our spirocarbon strategy proposed in this JSPS application, we anticipated that 9,9’-bifuloronilidene (99’BF) would become “prochiral” monomer unit to synthesize stereoregular conjugated polymers.
(2) Study on the relationship between structural conformers and photophysical / electrochemical properties: 99’BF-based conjugated polymers
The approach towards the synthesis of newly designed 99’-bifluorenylidene based monomers (BFFL27), which bears a twisting unit upper part. The chemical structure of BFFL27 and BFFL derivatives were characterized by NMR, MALDI-TOF MS. Polymers were synthesized through Yamamoto polymerization. The resulting polymer exhibits good solubility in conventional organic solvents, such as THF, Toluene, CHCl2 and CHCl3, etc. The molecular structures of synthesized polymers were verified by 1H NMR. The molecular weight of BFPF27 was analyzed by gel permeation chromatography (GPC) with THF as eluent and calibrated against polystyrene standards. The polymers displayed a high molecular weight with Mn of 18 KDa with polydispersity (PDI: Mw / Mn) in the range of 2.1 according to the GPC analysis. The thermal stability of BFPF27 was estimated by thermogravimetric (TGA) under nitrogen atmosphere.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
フルオレンそのものに選択的に不斉点を導入することに困難が生じたために、あらたにプロキラルなモノマーをデザインした。最終的な立体規則性高分子の合成には至っていないが、鍵となるモノマーの合成とその重合にすでに成功しており、物性の測定に着手している。
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| Strategy for Future Research Activity |
ポリマー主鎖に導入された置換基が生み出す立体規則性をスピロ炭素戦略により導入するために新たなモノマーを導入した研究を推進する。得られた不斉配向モノマー、ポリマーに関して、溶液、薄膜状態の詳細な分光学的特性を紫外可視吸収、発光、円偏光二色性スペクトル、によって検討する。また、得られオリゴマーあるいはポリマーが液晶相を示す可能性もあるため、DSC測定を行い熱的な特性を明らかとする。集合体形状はFE-SEMおよび原子間力顕微鏡（AFM）により確認し、主鎖配向に関する検討は XRD測定により行う。
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Research Products
(1 results)
