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

doi:10.1016/j.carbpol.2019.05.068

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

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 (T_CP) 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 T_CP 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 T_CP 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 T_CP changed in a fully reversible manner.

Original language	English
Pages (from-to)	48-54
Number of pages	7
Journal	Carbohydrate Polymers
Volume	221
DOIs	https://doi.org/10.1016/j.carbpol.2019.05.068
Publication status	Published - 2019 Oct 1

Bibliographical note

Funding Information:
This work was supported by the Mid-Career Researcher Program [ 2017R1A2A1A17069537 ] funded by the National Research Foundation (NRF) of Korea .

Publisher Copyright:
© 2019 Elsevier Ltd

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/j.carbpol.2019.05.068

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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}",

note = "Funding Information: This work was supported by the Mid-Career Researcher Program [ 2017R1A2A1A17069537 ] funded by the National Research Foundation (NRF) of Korea . Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

month = oct,

day = "1",

doi = "10.1016/j.carbpol.2019.05.068",

language = "English",

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T1 - Cyclodextrin-bearing telechelic poly(2-isopropyl-2-oxazoline)

T2 - Extremely large shifts of phase transition temperature by photo-responsive guest inclusion

AU - Lee, Jiyoung

AU - Park, Jong Min

AU - Jang, Woo Dong

N1 - Funding Information: This work was supported by the Mid-Career Researcher Program [ 2017R1A2A1A17069537 ] funded by the National Research Foundation (NRF) of Korea . Publisher Copyright: © 2019 Elsevier Ltd

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

Abstract

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