Dynamic mechanical analysis (DMA) is a technique used to study and characterize the viscoelastic behaviour of polymers according to ASTM D4065, D4440 and D5279. DMA measures the modulus of elasticity (storage modulus, G’ or loss modulus G’’) and damping coefficient (Tan Delta: ratio of G” to G’) as a function of temperature, time or frequency by applying an oscillating force to the sample.
This approach can be used to identify transitions in plastic materials, which correspond to the molecular motions, such as the glass transition temperature or β relaxation (local movement of polymer groups). DMA is much more sensitive than other techniques identifying transitions in composite materials and polymer thin films coated on solid substrates, which are beyond the resolution of the differential scanning calorimetry (DSC).
Dynamic mechanical analysis (DMA) in action (by Mettler-Toledo)
If video doesn’t show, please click here.
DMA techniques support the plastic research and development industry, enabling the accurate identification of the mechanical properties of the new materials, within a broad temperature range (-150 C to 600 C). Furthermore, DMA is a necessary technique used for the quality assurance of the plastic materials, allowing the recording of the phase transitions and their comparison against the standards and the product specifications/restrictions.
Impact Solutions in collaboration with the University of Edinburgh, has now expanded its dynamic mechanic analysis capabilities, using the state-of-the-art DMA from Mettler-Toledo. Combining the DMA with our already successful DSC capabilities, in Impact we are able to offer exceptional and accurate mechanical and thermal tests to any kind of virgin, filled, blended or composite plastic materials.
For more information please contact us on +44 1324 489 182, or via email at firstname.lastname@example.org, where one of our plastic experts will be delighted to help you out.