Preparation and solution behavior of a thermoresponsive diblock copolymer of poly(ethyl glycidyl ether) and poly(ethylene oxide)

Michihiro Ogura, Hiroyuki Tokuda, Shinichiro Imabayashi, Masayoshi Watanabe

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

A thermoresponsive diblock copolymer, poly(ethyl glycidyl ether)-block-poly(ethylene oxide) (PEGE-b-PEO), is synthesized by successive anionic ring-opening polymerization of ethyl glycidyl ether and ethylene oxide using 2-phenoxyethanol as a starting material, and its solution behavior is elucidated in water. In a dilute 1 wt % solution, the temperature-dependent alteration in the polymer hydrodynamic radius (RH) is measured in the temperature range between 5 and 45°C by pulse-gradient spin-echo NMR and dynamic light scattering. The RH value increased with temperature in two steps, where the first step at 15°C corresponds to the core-shell micelle formation and the second step at 40°C corresponds to the aggregation of the core-shell micelles. The formation of the core-shell micelles is supported by the solubilization of a dye (1,6-diphenyl-1,3,5-hexatriene) in the hydrophobic core, which is recognized for a copolymer solution in the temperature range between 20 and 40°C. In this temperature range, the core-shell micelles and the unimers coexist and the fraction of the former gradually increases with increasing temperature, suggesting equilibrium between the micelles and the unimers. In the concentrated regime (40 wt % solution), the solution forms a gel and the small-angle X-ray scattering measurements reveal the successive formation of hexagonal and lamellar liquid crystal phases with increasing temperature.

Original languageEnglish
Pages (from-to)9429-9434
Number of pages6
JournalLangmuir
Volume23
Issue number18
DOIs
Publication statusPublished - 2007 Aug 28

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ethylene oxide
Polyethylene oxides
Block copolymers
Ethers
ethers
copolymers
Micelles
preparation
micelles
Temperature
temperature
Diphenylhexatriene
Liquid Crystals
Ethylene Oxide
Anionic polymerization
Ring opening polymerization
Dynamic light scattering
glycidyl ethers
X ray scattering
Liquid crystals

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Preparation and solution behavior of a thermoresponsive diblock copolymer of poly(ethyl glycidyl ether) and poly(ethylene oxide). / Ogura, Michihiro; Tokuda, Hiroyuki; Imabayashi, Shinichiro; Watanabe, Masayoshi.

In: Langmuir, Vol. 23, No. 18, 28.08.2007, p. 9429-9434.

Research output: Contribution to journalArticle

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