Cyclodextrin-bearing telechelic poly(2-isopropyl-2-oxazoline): Extremely large shifts of phase transition temperature by photo-responsive guest inclusion

Jiyoung Lee, Jong Min Park, Woo Dong Jang

Research output: Contribution to journalArticle

Abstract

As a dual-stimuli-responsive polymer, α−cyclodextrin-bearing telechelic poly(2-isopropyl-2-oxazoline)(CD-PiPrOx-CD) was prepared by living cationic ring opening polymerization followed by click reaction (copper-catalyzed alkyne-azide cycloaddition). The phase transition temperature (TCP) of CD-PiPrOx-CD (0.33 mM) in 10 mM PBS solution (150 mM NaCl, pH 7.4) was 42.9 °C, and dramatically changed to 8.5 °C upon addition of the azobenzene-bearing penta(ethylene glycol)(Az-5EG)(3.3 mM). A change in the TCP was again observed for the mixture solution of CD-PiPrOx-CD and Az-5EG upon ultra-violet (UV) irradiation at 365 nm. Under 365-nm UV irradiation for 30 min, the TCP of CD-PiPrOx-CD changed to 41.3 °C, indicating the release of Az-5EG from the host-guest complex. During alternate irradiation at 365 and 254 nm, the TCP changed in a fully reversible manner.

Original languageEnglish
Pages (from-to)48-54
Number of pages7
JournalCarbohydrate Polymers
Volume221
DOIs
Publication statusPublished - 2019 Oct 1

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Bearings (structural)
Cyclodextrins
Superconducting transition temperature
Phase transitions
Irradiation
Cationic polymerization
Azobenzene
Cycloaddition
Ring opening polymerization
Ethylene glycol
Alkynes
Azides
Ethylene Glycol
Copper
Polymers
piproxen

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

@article{8c17bbede8a64633a1fa5202315bf4fd,
title = "Cyclodextrin-bearing telechelic poly(2-isopropyl-2-oxazoline): Extremely large shifts of phase transition temperature by photo-responsive guest inclusion",
abstract = "As a dual-stimuli-responsive polymer, α−cyclodextrin-bearing telechelic poly(2-isopropyl-2-oxazoline)(CD-PiPrOx-CD) was prepared by living cationic ring opening polymerization followed by click reaction (copper-catalyzed alkyne-azide cycloaddition). The phase transition temperature (TCP) of CD-PiPrOx-CD (0.33 mM) in 10 mM PBS solution (150 mM NaCl, pH 7.4) was 42.9 °C, and dramatically changed to 8.5 °C upon addition of the azobenzene-bearing penta(ethylene glycol)(Az-5EG)(3.3 mM). A change in the TCP was again observed for the mixture solution of CD-PiPrOx-CD and Az-5EG upon ultra-violet (UV) irradiation at 365 nm. Under 365-nm UV irradiation for 30 min, the TCP of CD-PiPrOx-CD changed to 41.3 °C, indicating the release of Az-5EG from the host-guest complex. During alternate irradiation at 365 and 254 nm, the TCP changed in a fully reversible manner.",
author = "Jiyoung Lee and Park, {Jong Min} and Jang, {Woo Dong}",
year = "2019",
month = "10",
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doi = "10.1016/j.carbpol.2019.05.068",
language = "English",
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T2 - Extremely large shifts of phase transition temperature by photo-responsive guest inclusion

AU - Lee, Jiyoung

AU - Park, Jong Min

AU - Jang, Woo Dong

PY - 2019/10/1

Y1 - 2019/10/1

N2 - As a dual-stimuli-responsive polymer, α−cyclodextrin-bearing telechelic poly(2-isopropyl-2-oxazoline)(CD-PiPrOx-CD) was prepared by living cationic ring opening polymerization followed by click reaction (copper-catalyzed alkyne-azide cycloaddition). The phase transition temperature (TCP) of CD-PiPrOx-CD (0.33 mM) in 10 mM PBS solution (150 mM NaCl, pH 7.4) was 42.9 °C, and dramatically changed to 8.5 °C upon addition of the azobenzene-bearing penta(ethylene glycol)(Az-5EG)(3.3 mM). A change in the TCP was again observed for the mixture solution of CD-PiPrOx-CD and Az-5EG upon ultra-violet (UV) irradiation at 365 nm. Under 365-nm UV irradiation for 30 min, the TCP of CD-PiPrOx-CD changed to 41.3 °C, indicating the release of Az-5EG from the host-guest complex. During alternate irradiation at 365 and 254 nm, the TCP changed in a fully reversible manner.

AB - As a dual-stimuli-responsive polymer, α−cyclodextrin-bearing telechelic poly(2-isopropyl-2-oxazoline)(CD-PiPrOx-CD) was prepared by living cationic ring opening polymerization followed by click reaction (copper-catalyzed alkyne-azide cycloaddition). The phase transition temperature (TCP) of CD-PiPrOx-CD (0.33 mM) in 10 mM PBS solution (150 mM NaCl, pH 7.4) was 42.9 °C, and dramatically changed to 8.5 °C upon addition of the azobenzene-bearing penta(ethylene glycol)(Az-5EG)(3.3 mM). A change in the TCP was again observed for the mixture solution of CD-PiPrOx-CD and Az-5EG upon ultra-violet (UV) irradiation at 365 nm. Under 365-nm UV irradiation for 30 min, the TCP of CD-PiPrOx-CD changed to 41.3 °C, indicating the release of Az-5EG from the host-guest complex. During alternate irradiation at 365 and 254 nm, the TCP changed in a fully reversible manner.

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