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Molecular Weight Fractionation by Confinement of Polymer in One-dimensional Pillar[5]arene Channels by Tomoki Ogoshi; Ryuta Sueto; Masafumi Yagyu; Ryosuke Kojima; Takahiro Kakuta; Tada-aki Yamagishi; Kazuki Doitomi; Anil Kumar Tummanapelli; Hajime Hirao; Yoko Sakata; Shigehisa Akine; Motohiro Mizuno is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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## Abstract Confinement of polymers in nano-spaces can induce unique molecular dynamics and properties. Here we show molecular weight fractionation by the confinement of single polymer chains of poly(ethylene oxide) (PEO) in the one-dimensional (1D) channels of crystalline pillar[5]arene. Pillar[5]arene crystals are activated by heating under reduced pressure. The activated crystals are immersed in melted PEO, causing the crystals to selectively take up PEO with high mass fraction. The high mass fractionation is caused by the greater number of attractive CH/π interactions between PEO C-H groups and the π-electron-rich 1D channel of the pillar[5]arene with increasing PEO chain length. The molecular motion of the confined PEO (PEO chain thickness of ~3.7 Å) in the 1D channel of pillar[5]arenes (diameter of ~4.7 Å) is highly restricted compared with that of neat PEO.

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Author

Tomoki Ogoshi; Ryuta Sueto; Masafumi Yagyu; Ryosuke Kojima; Takahiro Kakuta; Tada-aki Yamagishi; Kazuki Doitomi; Anil Kumar Tummanapelli; Hajime Hirao; Yoko Sakata; Shigehisa Akine; Motohiro Mizuno

Publisher

Springer Science and Business Media LLC

Published

2019

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)