論文雑誌「Polymer Chemistry」のカバーピクチャーを制作しました［東京大学］
弊社で制作しました東京大学 上沼駿太郎先生のカバーアートが
イギリスの王立化学会発行の学術雑誌 Polymer Chemistry
2022年1月号に選ばれました。
Client
東京大学
大学院新領域創成科学研究科 物質系専攻
上沼駿太郎先生
大学院新領域創成科学研究科 物質系専攻
上沼駿太郎先生
Journal
Polymer Chemistry
28 January 2022, Issue 4 Link
28 January 2022, Issue 4 Link
Thermally induced disassembly mechanism of pseudo-polyrotaxane nanosheets consisting of β-CD and a poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) triblock copolymer
Naoki Ando, Shuntaro Uenuma, Hideaki Yokoyama and Kohzo Ito
A pseudo-polyrotaxane (PPR) is a topological supramolecule in which an axis polymer chain is included by multiple cyclic molecules such as cyclodextrins (CDs). We recently reported the formation of a pseudo-polyrotaxane nanosheet (PPRNS), which possesses a self-assembled nanosheet structure bearing a PPR consisting of β-cyclodextrins (β-CDs) and a carboxyl-terminated poly(ethylene oxide)75-b-poly(propylene oxide)29-b-poly(ethylene oxide)75 triblock copolymer (COOH-EO75PO29EO75). In this study, we investigated the disassembly mechanism of the PPRNS upon heating from the viewpoint of crystallinity, particle morphology, and PPRNS concentration through proton nuclear magnetic resonance spectroscopy, scanning electron microscopy, and X-ray scattering analysis. The results revealed that the PPRNS dissolved in two steps during heating. First, β-CDs of the PPRNS de-threaded from the axis and the PPRNS dissolved in the out-of-plane direction thinned while maintaining the rhombic structure. Upon further heating, both β-CD and the PPR dissolved, collapsing the rhombic structure of the PPRNS in the in-plane direction—this occurred upon the melting of the β-CD crystals of the PPRNS—thereby achieving an amorphous state. In conclusion, the PPRNS showed structural changes in two directions over different temperature ranges upon heating, owing to the anisotropy of the topological constraint of β-CD by the axis polymer.
Link
Naoki Ando, Shuntaro Uenuma, Hideaki Yokoyama and Kohzo Ito
A pseudo-polyrotaxane (PPR) is a topological supramolecule in which an axis polymer chain is included by multiple cyclic molecules such as cyclodextrins (CDs). We recently reported the formation of a pseudo-polyrotaxane nanosheet (PPRNS), which possesses a self-assembled nanosheet structure bearing a PPR consisting of β-cyclodextrins (β-CDs) and a carboxyl-terminated poly(ethylene oxide)75-b-poly(propylene oxide)29-b-poly(ethylene oxide)75 triblock copolymer (COOH-EO75PO29EO75). In this study, we investigated the disassembly mechanism of the PPRNS upon heating from the viewpoint of crystallinity, particle morphology, and PPRNS concentration through proton nuclear magnetic resonance spectroscopy, scanning electron microscopy, and X-ray scattering analysis. The results revealed that the PPRNS dissolved in two steps during heating. First, β-CDs of the PPRNS de-threaded from the axis and the PPRNS dissolved in the out-of-plane direction thinned while maintaining the rhombic structure. Upon further heating, both β-CD and the PPR dissolved, collapsing the rhombic structure of the PPRNS in the in-plane direction—this occurred upon the melting of the β-CD crystals of the PPRNS—thereby achieving an amorphous state. In conclusion, the PPRNS showed structural changes in two directions over different temperature ranges upon heating, owing to the anisotropy of the topological constraint of β-CD by the axis polymer.
Link
