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

https://mdr.nims.go.jp/datasets/92747813-8442-4981-ad1b-b363ab9e56aa

## File

- [[Chem.Commun.]From LCST to crystals Structural modulation of ionic liquids drives the phase transition of PiPrOx.pdf](https://mdr.nims.go.jp/filesets/e9ab073c-cb42-4714-b494-56adb3e185be/download) ([Detail](https://mdr.nims.go.jp/filesets/e9ab073c-cb42-4714-b494-56adb3e185be.md))

## Id

92747813-8442-4981-ad1b-b363ab9e56aa

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-06-13T00:19:14.621122Z

## Updated at

2025-06-13T03:30:20.323642Z

## Published at

2025-06-13T03:22:25.193909Z

## Doi



## First published url

https://doi.org/10.1039/d5cc01017a

## Date published

2025-04-10

## Recorded date published

2025-6-12

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: 'From LCST to crystals: structural modulation of ionic liquids drives the
    phase transition of poly(2-isopropyl-2-oxazoline)'
  title_type: original
  lang: en

## Description

- description: This study investigates the phase behavior and crystallization properties
    of poly(2-isopropyloxazoline) (PiPrOx) in ionic liquid systems. While PiPrOx is
    known to exhibit lower critical solution temperature (LCST)-type phase separation
    in water, our findings reveal that in ionic liquids, PiPrOx displays either LCST-
    or upper critical solution temperature (UCST)-type transitions depending on the
    chemical structure of the ionic liquid, particularly the anion. Notably, only
    under LCST-type conditions does PiPrOx undergo immediate and irreversible crystallization
    following phase separation. FT-IR spectroscopy shows that PiPrOx adopts a trans-rich
    conformation in ionic liquids exhibiting LCST-type transitions, even in the dissolved
    state. This ordered conformation is hypothesized to both lower the entropy of
    mixing, thereby satisfying the thermodynamic requirement for LCST behavior, and
    facilitate rapid crystallization. These findings offer new insights into polymer-solvent
    interactions in ionic liquids and their implications for designing functional
    polymer materials.
  description_type: abstract
  lang: und

## Creator

- name: Mai Kamiyama-Ueda
  role: author
  orcid: https://orcid.org/0009-0003-4029-893X
- name: Takeshi Ueki
  role: author
  orcid: https://orcid.org/0000-0001-9317-6280
- name: Yuji Kamiyama
  role: author
  orcid: https://orcid.org/0000-0001-9483-2112
- name: Ryota Tamate
  role: author
  orcid: https://orcid.org/0000-0002-1704-1058
- name: Keisuke Watanabe
  role: author
  orcid: https://orcid.org/0000-0001-6374-3918
- name: Yukiteru Katsumoto
  role: author
  orcid: https://orcid.org/0000-0001-7773-2558

## Contact agent



## Publisher

organization: Royal Society of Chemistry (RSC)

## Managing organization



## Keyword

- subject: ionic liquid
  schema: not_defined
- subject: LCST
  schema: not_defined
- subject: crystallization
  schema: not_defined
- subject: UCST
  schema: not_defined
- subject: phase transition
  schema: not_defined
- subject: poly(2-isopropyl-2-oxazoline)
  schema: not_defined

## Rights

- identifier: cc-by-3.0

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Chemical Communications
  issn: '13597345'
  volume: '61'
  issue: '49'
  start_page: 8843
  end_page: 8846

## Conference



## Related item



## Funding

- identifier: 20H02804
  funder_name: Japan Society for the Promotion of Science
- identifier: 20K21229
  funder_name: Japan Society for the Promotion of Science
- identifier: 23H02030
  funder_name: Japan Society for the Promotion of Science

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: e9ab073c-cb42-4714-b494-56adb3e185be
  filename: "[Chem.Commun.]From LCST to crystals Structural modulation of ionic liquids
    drives the phase transition of PiPrOx.pdf"
  content_type: application/pdf
  size: 2618023
  md5: 8af6755150de857b6f265f4b347d14e0

## Thumbnail

fileset_id: e9ab073c-cb42-4714-b494-56adb3e185be
filename: "[Chem.Commun.]From LCST to crystals Structural modulation of ionic liquids
  drives the phase transition of PiPrOx.pdf"