| 研究課題/領域番号 |
17J01195
|
|---|
| 研究機関 | 北海道大学 |
|---|
研究代表者 |
Ree Brian J. 北海道大学, 大学院総合化学院, 特別研究員(DC1)
|
|---|
| 研究期間 (年度) |
2017-04-26 – 2020-03-31
|
| キーワード | functional brush polymer / brush block copolymer / ferroelectric memory / oxygen-based memory |
|---|
| 研究実績の概要 |
The first year began with the molecular design and synthesis of functional topological brush block copolymers of novel ferroelectric digital memory and novel drug delivery micelle system. Due to high complexity of drug delivery polymer synthesis, it was replaced with oxygen-based novel polymers for digital memory.
Novel ferroelectric digital memory system is defined by the perfluorinated block (for exhibiting ferroelectric digital memory properties) and alkyl block (dielectric matrix). The anionic polymerization of epichlorohydrin yielded well-defined poly(epichlorohydrin) (PECH). PECH was then reacted with 1-methylimidazole and then mixed with perfluorinated carboxylic acids to form four types of perfluorinated brush hompolymers with varying length of brushes. The anionic polymerization of alkyl brush epoxide (tetradecyl gylcidyl ether) yielded well-defined poly(tetradecyl gylcidyl ether) (PTGE). The molecular characterization of these brush homopolymers (1H NMR, IR, SEC, TGA/DSC) are currently ongoing.
Novel polymers with oxygen-based electroactive moieties will investigate the charge transferring ability of oxygen and develop a new memory polymer system. A commercially available copolymer of ethylene and maleic anhydride was reacted with eight different types of oxygen containing alcohols through esterification. Alcohols were selected to have oxygen participating in conjugation, oxygen separated from conjugation, or oxygen present with no conjugation. Molecular characterization through 1H NMR, IR, and SEC have confirmed successful synthesis of all polymers.
|
| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
Despite replacing drug delivery systems with a new memory system, the synthetic progress of the well-defined polymers for ferroelectric memory system and oxygen-based memory system have been successful.
The synthesis of ferroelectric memory system will continue to the production of topological block copolymers alongside the basic characterization of prepared brush hompolymers via 1H NMR, IR, SEC, and TGA/DSC. The measurement of ferroelectric property, digital memory performance, and nanostructure formation ability of perfluorinated brush homopolymers will begin shortly as well to feedback useful insights for the synthesis of block copolymers.
The synthesis of the oxygen-based polymers for digital memory has been completed and the basic characterization via 1H NMR, IR, and SEC have confirmed successful synthesis for all polymers. The measurement of thermal property, digital memory performance, and nanostructure formation ability of these polymers will shortly begin to look further into the mechanisms behind charge transportation and correlation between memory behavior and oxygen.
|
| 今後の研究の推進方策 |
As stated in the research proposal, synthetic work and basic molecular characterization of the synthesized polymers will continue.
As for the ferroelectric memory system, the homopolymers will be subject to basic characterization as well as synchrotron X-ray reflectivity (XR) and X-ray scattering (XS) techniques to measure the nanostructure formation. The homopolymers will also be fabricated into thin film memory devices to evaluate their ferroelectric property and resistive memory performance. These information will provide crucial insights for the upcoming synthesis of topological brush block copolymers.
The synthetic procedure and basic molecular characterization for the oxygen-based polymers have been completed. These polymers will be further characterized with TGA/DSC, XR, and XS techniques to reveal their nanostructure formation ability. In addition, nanoscale thin film memory devices will be fabricated for the evaluation of resistive memory performance as well as the investigation of the role of oxygen in resistive memory phenomenon.
|
