Hydrophilic-hydrophobic phase transition of photoresponsive linear and macrocyclic poly(2-isopropyl-2-oxazoline)s

Yongseok Jung, Jaehyuk Nam, Joo Ho Kim, Woo Dong Jang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A series of macrocyclic and linear poly(2-isopropyl oxazoline)s containing a photoresponsive azobenzene moiety (Az-PiPOxs) were synthesized by Cu(i)-catalyzed cycloaddition reaction between azide-functionalized azobenzene and alkyne-bearing poly(2-isopropyl oxazoline)s. Upon temperature elevation, both macrocyclic and linear Az-PiPOx exhibited a sharp hydrophilic-to-hydrophobic phase transition: the initially clear solution became turbid at specific temperatures. The photoisomerization of the azobenzene moiety resulted in the large change of the thermal transition temperature of the polymers. cis isomers exhibited a higher thermal transition temperature than trans isomers. Thus, the phase transition can be controlled by 365 and 254 nm UV irradiation.

Original languageEnglish
Pages (from-to)10074-10080
Number of pages7
JournalRSC Advances
Volume7
Issue number17
DOIs
Publication statusPublished - 2017 Jan 1

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Azobenzene
Phase transitions
Isomers
Superconducting transition temperature
Bearings (structural)
Photoisomerization
Alkynes
Azides
Cycloaddition
Polymers
Irradiation
Temperature
azobenzene
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

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Hydrophilic-hydrophobic phase transition of photoresponsive linear and macrocyclic poly(2-isopropyl-2-oxazoline)s. / Jung, Yongseok; Nam, Jaehyuk; Kim, Joo Ho; Jang, Woo Dong.

In: RSC Advances, Vol. 7, No. 17, 01.01.2017, p. 10074-10080.

Research output: Contribution to journalArticle

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AB - A series of macrocyclic and linear poly(2-isopropyl oxazoline)s containing a photoresponsive azobenzene moiety (Az-PiPOxs) were synthesized by Cu(i)-catalyzed cycloaddition reaction between azide-functionalized azobenzene and alkyne-bearing poly(2-isopropyl oxazoline)s. Upon temperature elevation, both macrocyclic and linear Az-PiPOx exhibited a sharp hydrophilic-to-hydrophobic phase transition: the initially clear solution became turbid at specific temperatures. The photoisomerization of the azobenzene moiety resulted in the large change of the thermal transition temperature of the polymers. cis isomers exhibited a higher thermal transition temperature than trans isomers. Thus, the phase transition can be controlled by 365 and 254 nm UV irradiation.

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