This section provides an overview for dynamic mechanical analyzers (dma) as well as their applications and principles. Also, please take a look at the list of 10 dynamic mechanical analyzer (dma) manufacturers and their company rankings.
Table of Contents
A viscoelasticity analyzer (DMA) measures the viscosity or elasticity of a solid sample by measuring the change in viscosity or elasticity when a shear or tensile force is applied to it.
Viscosity and elasticity are essential indicators for understanding the physical properties of polymeric materials.
In the molding process of polymers, there are issues of shrinkage of molded products and expansion during the injection. This phenomenon is also due to viscoelasticity, which must be considered when designing molding.
Viscoelasticity results vary depending on the temperature, frequency, and measurement time. When measuring, conditions should be selected according to the purpose.
Viscoelasticity measurements are mainly used for plastic products. Other than plastic products, viscoelasticity is also used to determine the texture of food products.
One of the Dynamic mechanical analyzers (DMA) is a rheometer. This section introduces rheometers.
A sample is placed between a base and a plate, and the plate is rotated periodically or vibrated to apply force to the sample. The force causes deformation, and viscoelasticity is measured from the deformation. There are different types of plates, but the cone-plate type is the most typical.
Viscosity and elasticity are the key elements, and these two are introduced here.
Viscosity: Strain is generated when an external force is applied to an object, and the strain does not disappear when the external force is removed. The applied energy is not in the object but is converted into thermal energy and released. The strain remains, and the object's shape does not return to how it was before the external force was applied.
Elasticity: This is the property of an object in which the strain that occurs when an external force is applied to the object disappears when the external force is removed. The applied energy is stored within the object and returns to its original state when the external force is removed.
Polymeric materials are viscoelastic with viscosity and elasticity. It is common to check the sum of each component rather than calculating each individually.
Parameters measured in viscoelasticity include storage modulus and loss modulus.
The storage modulus represents the strength of the elastic component, while the loss modulus represents the strength of the viscous component.
Another critical parameter is tan δ, which is the ratio of the loss modulus to the storage modulus. Tan δ represents the viscous contribution; the higher the tan δ, the closer the material is to a liquid.
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