Complexation behavior of poly(acrylic acid) and poly(ethylene oxide) in water and water-methanol

Heejoon Ahn, Eui Chul Kang, Chun Hag Jang, Ki Won Song, Jang Oo Lee

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

To investigate the effects of solvent type and temperature on the interpolymer complexation via hydrogen bonding, a study was made on the complex system of poly(acrylic acid) (PAA) and poly(ethylene oxide) (PEO) in two kinds of solvent systems, pure water and water-MeOH (30 wt%) mixed solvent, at various temperatures using the Ubbelohde viscometer, pH-meter, and UV spectrophotometer. The repeating unit mole ratio at the most optimum complexation as confirmed by the reduced viscosity measurement was shifted from [PEO]/[PAA] ≈ 1.25:1 to 1.5:1 by the addition of methanol to water. From the UV measurement, the deviation from the "isosbestic point" (where the absorbance of the solution remains constant) has presented another evidence for the solvent effect on complexation. In addition, the analysis of the changes in thermodynamic properties upon complexation as well as the fraction of carboxyls associated with PEO oxygens and the complex stability constant as estimated by potentiometric titration at several temperatures reveals that the complex formation in mixed solvent became more unfavorable compared to that in pure solvent at high temperatures above 30°C. This could be explained by considering that in water the hydrophobic interaction as well as the hydrogen bonding may greatly contribute to the stabilization of the polymer complex formed, while in water-methanol the main stabilizing force would be the hydrogen bonding alone.

Original languageEnglish
Pages (from-to)573-590
Number of pages18
JournalJournal of Macromolecular Science - Pure and Applied Chemistry
Volume37 A
Issue number6
DOIs
StatePublished - 2000 Jan 1

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carbopol 940
Polyethylene oxides
Complexation
Acrylics
Methanol
Acids
Water
Hydrogen bonds
pH meters
Ultraviolet spectrophotometers
Temperature
Viscometers
Viscosity measurement
Titration
Large scale systems
Polymers
Thermodynamic properties
Stabilization

Keywords

  • Complexation
  • Hydrogen Bonding
  • Hydrophobic Interaction
  • Stability Constant
  • Unit Mole Ratio

Cite this

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abstract = "To investigate the effects of solvent type and temperature on the interpolymer complexation via hydrogen bonding, a study was made on the complex system of poly(acrylic acid) (PAA) and poly(ethylene oxide) (PEO) in two kinds of solvent systems, pure water and water-MeOH (30 wt{\%}) mixed solvent, at various temperatures using the Ubbelohde viscometer, pH-meter, and UV spectrophotometer. The repeating unit mole ratio at the most optimum complexation as confirmed by the reduced viscosity measurement was shifted from [PEO]/[PAA] ≈ 1.25:1 to 1.5:1 by the addition of methanol to water. From the UV measurement, the deviation from the {"}isosbestic point{"} (where the absorbance of the solution remains constant) has presented another evidence for the solvent effect on complexation. In addition, the analysis of the changes in thermodynamic properties upon complexation as well as the fraction of carboxyls associated with PEO oxygens and the complex stability constant as estimated by potentiometric titration at several temperatures reveals that the complex formation in mixed solvent became more unfavorable compared to that in pure solvent at high temperatures above 30°C. This could be explained by considering that in water the hydrophobic interaction as well as the hydrogen bonding may greatly contribute to the stabilization of the polymer complex formed, while in water-methanol the main stabilizing force would be the hydrogen bonding alone.",
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Complexation behavior of poly(acrylic acid) and poly(ethylene oxide) in water and water-methanol. / Ahn, Heejoon; Kang, Eui Chul; Jang, Chun Hag; Song, Ki Won; Lee, Jang Oo.

In: Journal of Macromolecular Science - Pure and Applied Chemistry, Vol. 37 A, No. 6, 01.01.2000, p. 573-590.

Research output: Contribution to journalArticle

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AU - Kang, Eui Chul

AU - Jang, Chun Hag

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AU - Lee, Jang Oo

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