Utilization of polymer viscoelastic properties in acoustic wave sensor applications

Conference · Mon Jan 01 04:00:00 EST 1990

DOI:https://doi.org/10.1109/SOLSEN.1990.109829· OSTI ID:6971743

Martin, S J; Ricco, A J; Frye, G C

The changes which occur in polymer viscoelasitc properties in response to cross-linking reactions and due to absorption of gas phase species have been used advatageously in several acoustic wave-based sensor applications. When a polymer film is present on the surface of an acoustic wave device, changes in the visoelastic properties of the film induce changes in wave porpagation velocity and attenuation, providing two sensor responses. Film changes which occur polymer cross-linking allow photopolymerization to be monitored in real time using acoustic devices. A photoaction spectrum of photoresist reveals the cross-linking wavelength with maximum quantum yield. Changes in the viscoelastic properties of a polysiloxane film induces by vapor absorption are found to be unique for each of several species, enabling differentiation of species with a single film. A Maxwell model for polymer viscoelasticity, in combination with mass loading effects, provides a sound theoretical basis for explaining observed results for both polysiloxane and polybytadiene/polystyrene copolymer films. 16 refs., 5 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6971743
• Report Number(s): SAND-89-0126C; CONF-9006171--1; ON: DE90010534
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603 -- Materials-- Properties
440800* -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
ABSORPTION
ACOUSTIC MONITORING
ATTENUATION
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CONCENTRATION RATIO
CROSS-LINKING
DIFFERENTIAL EQUATIONS
ELASTICITY
EQUATIONS
FILMS
FLUIDS
FUNCTIONS
LIQUIDS
MAXWELL EQUATIONS
MECHANICAL PROPERTIES
MONITORING
PARTIAL DIFFERENTIAL EQUATIONS
PERFORMANCE TESTING
POLYMERIZATION
POLYMERS
REMOTE SENSING
RESPONSE FUNCTIONS
SOLVENTS
TENSILE PROPERTIES
TESTING
THIN FILMS
VISCOSITY
WAVE PROPAGATION