Abstract
We describe a quantitative method for using the quartz crystal microbalance (QCM) to characterize the high frequency viscoelastic response of glassy polymer coatings with thicknesses in the 5-10 μm regime. By measuring the frequency and dissipation at the fundamental resonant frequency (5 MHz) and at the third harmonic (15 MHz), we obtain three independent quantities. For coatings with a predominantly elastic response, characterized by relatively low phase angles, these quantities are the mass per unit area of the coating, the density-shear modulus product, and the phase angle itself. The approach was demonstrated with a model polyurethane coating, where the evolution of these properties as a function of cure time was investigated. For fully cured films, data obtained from the QCM are in good agreement with results obtained from traditional dynamic mechanical analysis.
Original language | English (US) |
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Pages (from-to) | 9873-9879 |
Number of pages | 7 |
Journal | Langmuir |
Volume | 27 |
Issue number | 16 |
DOIs | |
State | Published - Aug 16 2011 |
ASJC Scopus subject areas
- Condensed Matter Physics
- Spectroscopy
- General Materials Science
- Surfaces and Interfaces
- Electrochemistry