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14 February 2017
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Teaching is concentrated in the faculties and schools, and the departments deal with research, which is also conducted by institutes and chairs, at the same time responsible for knowledge promotion.
Dynamomechanical analysis (DMA) it is used to measure the mechanical and viscoelastic properties of materials according to temperature, time and frequency when they are subjected to periodic stress.
In order to request the analysis of samples by DMA, you must contact the staff responsible for the equipment.
The toxicity and storage precautions of the samples must be reported.If unclaimed, surplus samples will be destroyed within one week of delivery of results.
Certain materials, such as polymers, show a combination of elastic and viscous behaviour when deformed.These materials are called viscoelastics and can be studied through the DMA.
In DMA, a dynamic force (in the form of a sinusoidal oscillation) is applied to a test tube of known dimensions and the deformation caused on it is measured.In DMA, a dynamic force (in the form of a sinusoidal oscillation) is applied to a test tube of known dimensions and the deformation caused on it is measured.In the case of a viscoelastic material, the offset angle will be between 0º and 90º.
In the DMA instrument, the sample tube is fixed using a specific tool depending on the type of mechanical test to be performed (bending, traction or cutting).The assembly is placed in an oven with precise temperature control.
The ratio between elastic behaviour/viscous behaviour of the material depends on two parameters: the temperature at which the sample is located and the frequency at which the oscillating force is applied.This is why the analysis program can be carried out in two ways: establishing a constant frequency and carrying out a sweep of temperatures or setting a temperature and varying the frequency to which the force is applied.
The following list contains some of the properties that can be studied using Dynamomechanical Analysis:
The most important areas of application include:
Pdf file of the technique
The acquisition of this equipment has been co-financed by the Agency for the Management of University and Research Grants (AGAUR) of the Generalitat de Catalunya through the European Regional Development Fund (FEDER).
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