Self-Assembly of Polyether Diblock Copolymers in Water and Ionic Liquids

Yumi Kobayashi, Yuzo Kitazawa, Takahiro Komori, Kazuhide Ueno, Hisashi Kokubo, Masayoshi Watanabe

Abstract

Here the thermoresponsive self-assembly of diblock copolymers comprising poly(ethyl glycidyl ether) (PEGE) and poly(ethylene oxide) (PEO) in water and ionic liquids (ILs) is investigated. PEGE undergoes lower critical solution temperature (LCST) phase separation in both water and 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([C2mim][NTf2]), while PEO is a compatible segment for these solvents. The diblock copolymers, PEGE-b-PEO, undergo thermosensitive unimer-micelle transitions at temperatures close to the LCST point (TLCST) of the PEGE homopolymer in water but not in [C2mim][NTf2], even at temperatures much higher than TLCST. The difference in the thermoresponsivity of these solutions is explored using differential scanning calorimetry results from rather small magnitudes of the thermodynamic parameters for the phase transition of the PEGE segment in [C2mim][NTf2], compared with those in water. Due to such small magnitudes, TLCST of the PEGE segment for the block copolymers in the IL is greatly affected by the elongation of soluble PEO segments. (Figure presented.) .

Original languageEnglish
Pages (from-to)1207-1211
Number of pages5
JournalMacromolecular Rapid Communications
Volume37
Issue number14
DOIs
StatePublished - 2016 Jul 1

Fingerprint

Temperature
Ethers
Water
Polyethylene oxides
Block copolymers
Ionic liquids
Self assembly
Polyethers
Homopolymerization
Amides
Phase separation
Micelles
Elongation
Differential scanning calorimetry
Phase transitions
Thermodynamics

Keywords

  • block copolymers
  • ionic liquids
  • low critical solution temperature
  • self-assembly

ASJC Scopus subject areas

  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Kobayashi, Y., Kitazawa, Y., Komori, T., Ueno, K., Kokubo, H., & Watanabe, M. (2016). Self-Assembly of Polyether Diblock Copolymers in Water and Ionic Liquids. Macromolecular Rapid Communications, 37(14), 1207-1211. DOI: 10.1002/marc.201600137

Self-Assembly of Polyether Diblock Copolymers in Water and Ionic Liquids. / Kobayashi, Yumi; Kitazawa, Yuzo; Komori, Takahiro; Ueno, Kazuhide; Kokubo, Hisashi; Watanabe, Masayoshi.

In: Macromolecular Rapid Communications, Vol. 37, No. 14, 01.07.2016, p. 1207-1211.

Research output: Contribution to journalArticle

Kobayashi, Y, Kitazawa, Y, Komori, T, Ueno, K, Kokubo, H & Watanabe, M 2016, 'Self-Assembly of Polyether Diblock Copolymers in Water and Ionic Liquids' Macromolecular Rapid Communications, vol 37, no. 14, pp. 1207-1211. DOI: 10.1002/marc.201600137
Kobayashi Y, Kitazawa Y, Komori T, Ueno K, Kokubo H, Watanabe M. Self-Assembly of Polyether Diblock Copolymers in Water and Ionic Liquids. Macromolecular Rapid Communications. 2016 Jul 1;37(14):1207-1211. Available from, DOI: 10.1002/marc.201600137

Kobayashi, Yumi; Kitazawa, Yuzo; Komori, Takahiro; Ueno, Kazuhide; Kokubo, Hisashi; Watanabe, Masayoshi / Self-Assembly of Polyether Diblock Copolymers in Water and Ionic Liquids.

In: Macromolecular Rapid Communications, Vol. 37, No. 14, 01.07.2016, p. 1207-1211.

Research output: Contribution to journalArticle

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