From LCST to crystals: structural modulation of ionic liquids drives the phase transition of poly(2-isopropyl-2-oxazoline)

Mai Kamiyama-Ueda; Takeshi Ueki; Yuji Kamiyama; Ryota Tamate; Keisuke Watanabe; Yukiteru Katsumoto

doi:10.1039/D5CC01017A

From LCST to crystals: structural modulation of ionic liquids drives the phase transition of poly(2-isopropyl-2-oxazoline)†

Mai Kamiyama-Ueda,

‡^ab Takeshi Ueki,

‡*^ab Yuji Kamiyama,

^a Ryota Tamate,

^a Keisuke Watanabe

^c and Yukiteru Katsumoto

*^c

Author affiliations

* Corresponding authors

^a Research Centre for Macromolecules and Biomaterials, National Institute of Materials and Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
E-mail: UEKI.Takeshi@nims.go.jp

^b Graduate School of Life Science, Hokkaido University, Kita 10, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan

^c Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Johnan-ku, Fukuoka 814-0180, Japan
E-mail: katsumoto@fukuoka-u.ac.jp

Abstract

Poly(2-isopropyl-2-oxazoline) (PiPrOx) exhibits UCST- or LCST-type phase transitions in ionic liquids (ILs) depending on the IL structure. In LCST-type ILs, where low solution entropy is favorable, PiPrOx crystallizes immediately after phase separation, unlike in water. FT-IR reveals a trans-rich conformation with structural constraint, facilitating both LCST-type phase separation and rapid crystallization.

Supplementary files

Article information

DOI: https://doi.org/10.1039/D5CC01017A
Article type: Communication
Submitted: 25 Feb 2025
Accepted: 09 Apr 2025
First published: 10 Apr 2025
This article is Open Access

Download Citation

Chem. Commun., 2025, Advance Article

Permissions

Request permissions

From LCST to crystals: structural modulation of ionic liquids drives the phase transition of poly(2-isopropyl-2-oxazoline)

M. Kamiyama-Ueda, T. Ueki, Y. Kamiyama, R. Tamate, K. Watanabe and Y. Katsumoto, Chem. Commun., 2025, Advance Article , DOI: 10.1039/D5CC01017A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

Chemical Communications

From LCST to crystals: structural modulation of ionic liquids drives the phase transition of poly(2-isopropyl-2-oxazoline)†

Abstract

Supplementary files

Article information

Download Citation

Permissions

From LCST to crystals: structural modulation of ionic liquids drives the phase transition of poly(2-isopropyl-2-oxazoline)

Social activity

Search articles by author

Spotlight

Advertisements