Molecular weight fractionation by confinement of polymer in one-dimensional pillar[5]arene channels

Tomoki Ogoshi (), Ryuta Sueto, Masafumi Yagyu, Ryosuke Kojima, Takahiro Kakuta, Tada-aki Yamagishi, Kazuki Doitomi, Anil Kumar Tummanapelli, Hajime Hirao, Yoko Sakata, Shigehisa Akine and Motohiro Mizuno
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Tomoki Ogoshi: Kanazawa University
Ryuta Sueto: Kanazawa University
Masafumi Yagyu: Kanazawa University
Ryosuke Kojima: Kanazawa University
Takahiro Kakuta: Kanazawa University
Tada-aki Yamagishi: Kanazawa University
Kazuki Doitomi: City University of Hong Kong, Tat Chee Avenue
Anil Kumar Tummanapelli: Nanyang Technological University
Hajime Hirao: Precursory Research for Embryonic Science and Technology (PRESTO), 4-1-8 Honcho
Yoko Sakata: Kanazawa University
Shigehisa Akine: Kanazawa University
Motohiro Mizuno: Kanazawa University

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-08372-1

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