Two-dimensional properties of surfactant-like polymer monolayrs

Mahn Won Kim, Tze-chiang Chung

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A functional polymer monolayer at an air/water interface has been studied systematically by substituting a hydrophobic backbone with a hydrophilic moiety (OH) by measuring the surface pressure as a function of surface concentration for different molecular weight polymers. The characteristic scaling exponent (ν) estimated from the isotherms and the overlap surface concentration suggests that the air/water interface becomes a better solvent as the amount of hydrophilic functional groups is increased. Also, the isotherms show that the area per polymer molecule increases with increasing amounts of OH groups. However, the water surface tension is most effectively reduced at the 50% substitution level, not at 100%. This optimum amount of OH group on the hydrophobic polymer is equivalent to the hydrophic/lypophic balance of a surfactant in the formation of microemulsions. Furthermore, the surface occupied area per OH group (σo) is estimated with the ideal gas law at a dilute surface concentrations. The results show that the σo is a minimum at the same substitution level at which the reduction of water surface tension is a maximum.

Original languageEnglish (US)
Pages (from-to)365-370
Number of pages6
JournalJournal of Colloid and Interface Science
Volume124
Issue number1
DOIs
StatePublished - Jan 1 1988

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Surface-Active Agents
Polymers
Surface active agents
Water
Isotherms
Surface tension
Substitution reactions
Functional polymers
Microemulsions
Air
Functional groups
Monolayers
Gases
Molecular weight
Molecules

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Cite this

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Two-dimensional properties of surfactant-like polymer monolayrs. / Kim, Mahn Won; Chung, Tze-chiang.

In: Journal of Colloid and Interface Science, Vol. 124, No. 1, 01.01.1988, p. 365-370.

Research output: Contribution to journalArticle

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