Quartz Crystal Microbalance with Dissipation (QCM-D) studies of the viscoelastic response from a continuously growing grafted polyelectrolyte layer

Gunnar Dunér, Esben Thormann, Andra Dedinaite

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Poly(acrylic acid) was grown from substrates by photopolymerization, and the grafting process was monitored in situ by Quartz Crystal Microbalance with Dissipation (QCM-D) measurements in a 1:1 v/v mixture of water/ethanol. The polymerization process was monitored into the thick film region, where the change in frequency and dissipation with increasing film mass changes sign as predicted by the Voigt viscoelastic model. Our experimental data are compared with predictions of this model, and satisfactory agreement is found for low overtone numbers. The Voigt model was applied to analyze the measured changes in frequency, Δf, and dissipation, ΔD, in order to extract information on layer thickness, shear elasticity, μ, and shear viscosity, η, of the growing film. The increasing rate of changes in Δf and ΔD observed after about 150 s of polymerization was found to correlate with an increasing growth rate of the film thickness. For longer polymerization times a close to linear increase in thickness with time was observed. The sensitivity, defined as the derivatives of Δf and ΔD with respect to thickness, depends on overtone number and is different for the frequency and dissipation signals - facts that should be considered when investigating small changes in thick films used in e.g. sensor applications. © 2013 Elsevier Inc.
Original languageEnglish
JournalJournal of Colloid and Interface Science
Volume408
Issue number1
Pages (from-to)229-234
ISSN0021-9797
DOIs
Publication statusPublished - 2013

Keywords

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Colloid and Surface Chemistry
  • Grafting from
  • Iniferter
  • Poly(acrylic acid)
  • QCM-D
  • Quartz crystal microbalance
  • Viscoelastic model
  • Voigt model
  • Iniferters
  • Poly(acrylic acid )
  • Viscoelastic modeling
  • Carboxylic acids
  • Elasticity
  • Film growth
  • Grafting (chemical)
  • Models
  • Photopolymerization
  • Polymerization
  • Quartz crystal microbalances
  • Thick films
  • Viscoelasticity
  • Polyethylenes
  • alcohol
  • polyacrylic acid
  • polyelectrolyte
  • water
  • article
  • elasticity
  • film
  • measurement
  • polymerization
  • prediction
  • priority journal
  • quartz crystal microbalance
  • sensor
  • thickness
  • viscoelasticity
  • viscosity
  • Quartz Crystal Microbalance
  • Electrolytes
  • Polymers
  • Viscosity

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