Exchange Kinetics of Adsorbed Polymer and the Achievement of Conformational Equilibrium

Peter Frantz, Steve Granick

Research output: Contribution to journalArticlepeer-review

Abstract

We study adsorption-desorption kinetics of polymer chains at a solid surface. Protiopolystyrene, adsorbed from dilute cyclohexane to a single solid surface of oxidized silicon, was displaced by deuteriopolystyrene. A single time constant, τoff, described displacement for a significant time (1-3 h), followed by a period of slower desorption kinetics. An aging effect, in which τoff continued to increase even after the mass adsorbed had equilibrated, implied surprisingly slow rearrangements of adsorbed chains in the direction of conformational equilibrium. After long aging times, ranging from hours to days, τoff reached a plateau value. This equilibrated desorption time increased exponentially with the length of adsorbed chains.

Original languageEnglish (US)
Pages (from-to)2553-2558
Number of pages6
JournalMacromolecules
Volume27
Issue number9
DOIs
StatePublished - Apr 1 1994

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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