Structure of insoluble complex formed by a block copolymer of 2-ethyl-2-oxazoline and ethylene oxide and poly(methacrylic acid)

Yasuhiro Matsuda, Yasunori Shiokawa, Moriya Kikuchi, Atsushi Takahara, Shigeru Tasaka

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Complexes that were insoluble in water were formed by mixing aqueous solutions of a block copolymer of 2-ethtyl-2-oxazoline (EOX) and ethylene oxide (EO) and those of poly(methacrylic acid) (PMAA). The structures of these complexes were investigated by the results obtained mainly by infrared spectroscopy, X-ray diffraction, and differential scanning calorimetry. The molar ratio of MAA in the complexes was also estimated by analyzing the infrared spectra. Whereas homopolymers of EOX and EO formed nearly equimolar complexes with PMAA irrespective of the feed molar ratio, the molar ratio of MAA in the complexes formed by the block copolymer and PMAA depended on the feed molar ratio. Although the infrared spectra indicated structural differences between the homopolymer of EOX and EOX in the block copolymer before forming complexes, the spectra obtained for the complexes formed by the homopolymer and the block copolymer were similar to each other.

Original languageEnglish
Pages (from-to)4757-4764
Number of pages8
Journalpolymer
Volume55
Issue number18
DOIs
Publication statusPublished - Sep 2 2014

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Ethylene Oxide
Block copolymers
Ethylene
Homopolymerization
Oxides
Acids
Infrared radiation
Differential scanning calorimetry
Infrared spectroscopy
X ray diffraction
methacrylic acid
2-ethyl-2-oxazoline
Water

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Structure of insoluble complex formed by a block copolymer of 2-ethyl-2-oxazoline and ethylene oxide and poly(methacrylic acid). / Matsuda, Yasuhiro; Shiokawa, Yasunori; Kikuchi, Moriya; Takahara, Atsushi; Tasaka, Shigeru.

In: polymer, Vol. 55, No. 18, 02.09.2014, p. 4757-4764.

Research output: Contribution to journalArticle

Matsuda, Yasuhiro ; Shiokawa, Yasunori ; Kikuchi, Moriya ; Takahara, Atsushi ; Tasaka, Shigeru. / Structure of insoluble complex formed by a block copolymer of 2-ethyl-2-oxazoline and ethylene oxide and poly(methacrylic acid). In: polymer. 2014 ; Vol. 55, No. 18. pp. 4757-4764.
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AU - Shiokawa, Yasunori

AU - Kikuchi, Moriya

AU - Takahara, Atsushi

AU - Tasaka, Shigeru

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AB - Complexes that were insoluble in water were formed by mixing aqueous solutions of a block copolymer of 2-ethtyl-2-oxazoline (EOX) and ethylene oxide (EO) and those of poly(methacrylic acid) (PMAA). The structures of these complexes were investigated by the results obtained mainly by infrared spectroscopy, X-ray diffraction, and differential scanning calorimetry. The molar ratio of MAA in the complexes was also estimated by analyzing the infrared spectra. Whereas homopolymers of EOX and EO formed nearly equimolar complexes with PMAA irrespective of the feed molar ratio, the molar ratio of MAA in the complexes formed by the block copolymer and PMAA depended on the feed molar ratio. Although the infrared spectra indicated structural differences between the homopolymer of EOX and EOX in the block copolymer before forming complexes, the spectra obtained for the complexes formed by the homopolymer and the block copolymer were similar to each other.

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