Studying a polymer's reaction to the application of a force can provide details on the material's flow characteristics, modulus, and elasticity. These properties can help scientists and engineers select the right material for a given application.
Dynamic mechanical analysis (DMA) measures the mechanical properties of a rubber or polymeric material as a function of temperature, time, frequency, stress, or a combination of these parameters.
DMA analysis is particularly useful for thin films, pastes, adhesives, and powdered materials. The most common testing conducted by our laboratories includes the testing of vulcanized rubber specimens mixed in the laboratory or excised from actual products.
The usual outputs of DMA are Elastic (E') and Viscous (E'') moduli. The ratio of the E'' to the E' is the tan delta and is often called damping, which is a measure of the energy dissipation of a material. The tan delta can also be used to determine the glass transition temperature (Tg) of a material.
- ASTM D263—Standard Specification for Chrome Oxide Green Pigment
About our Labs
Our rubber testing labs are equipped with a DMA instrument with the following capabilities:
- Calibrated temperature range of between -150°C and 300°C
- Heating rates from 1°C to 20°C per minute
- Frequency oscillation ranges between 0.012 Hz to 150Hz
Our experts regularly conduct the following analyses:
- Testing of vulcanized rubber specimens mixed in the laboratory or excised from actual products
- Frequency sweeps, temperature sweeps, or strain sweeps
- Storage modulus, loss modulus, complex modulus, tangent delta
Amanda Cool is a project engineer focusing on dynamic mechanical analysis testing in the Smithers physical testing lab in Akron, Ohio.