Adsorption of ethylene oxide/propylene oxide/ethylene oxide triblock copolymers at the air/water interface

Q. Jiang, Y. C. Chiew, J. E. Valentini

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Capillary wave and Wilhelmy plate techniques have been used to study the adsorption kinetics of ethylene/propylene/ethylene oxide triblock copolymers (F127 and F68). By using the simple test that we proposed earlier, we have established that adsorption concentration F(t) of these copolymers increases with t( 1/4 ), after the formation of fresh interface. This observation suggests that the adsorption of these copolymers is diffusion-limited. The stress relaxation experiments performed on equilibrium surfaces of these copolymers show that the surface tension response to a step-type surface area change can be interpreted by the diffusion-controlled matter-exchange mechanism, even though these polymers are polydispersed. The high-frequency surface dilational modulus ε(o) and the average diffusive relaxation time constant τ(D) are obtained as functions of polymer concentration.

Original languageEnglish (US)
Pages (from-to)127-134
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume113
Issue number1-2
DOIs
StatePublished - Aug 1 1996

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Keywords

  • Air/water interface
  • Copolymer adsorption
  • Stress relaxation experiments

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