Dynamics and response of polymer-coated acoustic devices
In this paper we consider the dynamic behavior and the electrical response of a thickness-shear mode resonator with a polymer film coating one face. With glassy polymers (shear stiffness G{prime} {approx} 10{sup 10} dyne/cm{sup 2}), this film tends to move synchronously with the oscillating resonator surface, while with rubbery polymers (G{prime} {approx} 10{sup 7} dyne/cm{sup 2}), the upper portions of the film lag behind the driven resonator/film interface, causing shear deformation of the film. As polymer properties change, interesting dynamic film behavior results, notably a film resonance when the acoustic phase shift across the film is an odd multiple of {pi}2. This dynamic behavior influences the electrical response of the resonator due to the coupling between shear displacement and electric field in the piezoelectric quartz. Utilizing the fact that the polymer shear modulus changes rapidly as a function of temperature, these film behavior trends were demonstrated by measuring the electrical characteristics of a polyisobutylene-coated resonator as a function of frequency and at several temperatures. We show how these changing film dynamics can be correlated with changes in the measured electrical response. 11 refs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5330639
- Report Number(s):
- SAND-92-0102C; CONF-9206172--1; ON: DE92014289
- Country of Publication:
- United States
- Language:
- English
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42 ENGINEERING
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Electron Devices & Circuits-- (1990-)
ACOUSTIC TESTING
ALKENES
BUTENES
COATINGS
DEFORMATION
DYNAMICS
ELECTRONIC EQUIPMENT
EQUIPMENT
FILMS
HYDROCARBONS
MATERIALS TESTING
MECHANICS
MINERALS
NONDESTRUCTIVE TESTING
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OSCILLATIONS
OXIDE MINERALS
POLYMERS
QUARTZ
RESONATORS
SHEAR
TESTING
THIN FILMS