Linear and cyclic poly(2-isopropyl-2-oxazoline)s for fine control of thermoresponsiveness

Yongseok Jung, Joo Ho Kim, Woo Dong Jang

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Linear and cyclic poly(2-isopropyl-2-oxazoline)s (POx)s with the same average molar mass and molar mass distribution were synthesized by living cationic ring-opening polymerization of 2-isopropyl-2-oxazoline (Ox) and a successive intramolecular Cu(I)-catalyzed click reaction. The synthesis of linear poly(2-isopropyl-2-oxazoline) (l-POx) and cyclic poly(2-isopropyl-2-oxazoline) (c-POx) was characterized by 1H NMR, FT-IR, MALDI-TOF-MS and analytical SEC. Both POxs exhibited a sharp thermal transition upon temperature changes in physiological saline (150 mM NaCl) phosphate buffered solution (PBS, 10 mM, pH 7.4). Interestingly, the thermal transition temperature of the c-POx was much higher than that of the l-POx. The large difference of thermal transition temperatures between c-POx and l-POx was utilized for the fine tuning of the thermal transition temperature. By adjusting the mixing ratio of the two polymers, the thermal transition temperatures were varied from 44 to 57 °C.

Original languageEnglish
Pages (from-to)605-612
Number of pages8
JournalEuropean Polymer Journal
Volume88
DOIs
Publication statusPublished - 2017 Mar 1

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Superconducting transition temperature
transition temperature
Molar mass
Cationic polymerization
Ring opening polymerization
mixing ratios
mass distribution
phosphates
Polymers
Phosphates
polymerization
Tuning
adjusting
tuning
Nuclear magnetic resonance
Hot Temperature
nuclear magnetic resonance
rings
polymers
synthesis

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

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title = "Linear and cyclic poly(2-isopropyl-2-oxazoline)s for fine control of thermoresponsiveness",
abstract = "Linear and cyclic poly(2-isopropyl-2-oxazoline)s (POx)s with the same average molar mass and molar mass distribution were synthesized by living cationic ring-opening polymerization of 2-isopropyl-2-oxazoline (Ox) and a successive intramolecular Cu(I)-catalyzed click reaction. The synthesis of linear poly(2-isopropyl-2-oxazoline) (l-POx) and cyclic poly(2-isopropyl-2-oxazoline) (c-POx) was characterized by 1H NMR, FT-IR, MALDI-TOF-MS and analytical SEC. Both POxs exhibited a sharp thermal transition upon temperature changes in physiological saline (150 mM NaCl) phosphate buffered solution (PBS, 10 mM, pH 7.4). Interestingly, the thermal transition temperature of the c-POx was much higher than that of the l-POx. The large difference of thermal transition temperatures between c-POx and l-POx was utilized for the fine tuning of the thermal transition temperature. By adjusting the mixing ratio of the two polymers, the thermal transition temperatures were varied from 44 to 57 °C.",
author = "Yongseok Jung and Kim, {Joo Ho} and Jang, {Woo Dong}",
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Linear and cyclic poly(2-isopropyl-2-oxazoline)s for fine control of thermoresponsiveness. / Jung, Yongseok; Kim, Joo Ho; Jang, Woo Dong.

In: European Polymer Journal, Vol. 88, 01.03.2017, p. 605-612.

Research output: Contribution to journalArticle

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AB - Linear and cyclic poly(2-isopropyl-2-oxazoline)s (POx)s with the same average molar mass and molar mass distribution were synthesized by living cationic ring-opening polymerization of 2-isopropyl-2-oxazoline (Ox) and a successive intramolecular Cu(I)-catalyzed click reaction. The synthesis of linear poly(2-isopropyl-2-oxazoline) (l-POx) and cyclic poly(2-isopropyl-2-oxazoline) (c-POx) was characterized by 1H NMR, FT-IR, MALDI-TOF-MS and analytical SEC. Both POxs exhibited a sharp thermal transition upon temperature changes in physiological saline (150 mM NaCl) phosphate buffered solution (PBS, 10 mM, pH 7.4). Interestingly, the thermal transition temperature of the c-POx was much higher than that of the l-POx. The large difference of thermal transition temperatures between c-POx and l-POx was utilized for the fine tuning of the thermal transition temperature. By adjusting the mixing ratio of the two polymers, the thermal transition temperatures were varied from 44 to 57 °C.

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