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Thermo-Mechanometry

 

Just as scanning thermal microscopy may be combined with localised calorimetric analysis, it may likewise be combined with thermo-mechanical analysis.

 

The thermal probe itself is again used to provide the temperature ramp, and the mechanical signal is given by the microscope's force sensor. Thus, "Static L-TMA" is the SPM equivalent of the well-known technique of thermo-mechanical analysis, and "Dynamic L-TMA" is the SPM equivalent of Dynamic Mechanical Analysis (DMA), in which the sample is subjected to an imposed sinusoidal stress.

 

In DMA, thermal events are revealed in the resulting curves of storage modulus and loss modulus as a function of temperature. Although it does not reveal all the information provided by calorimetric analysis, it is several orders of magnitude more sensitive for the study of phase transitions and relaxation spectra. For such events, we find likewise that L-TMA offers a much higher sensitivity than L-CA. Both L-CA and L-TMA scans are often obtained simultaneously.

 

View Image - Mode of operation

 

View Image - Detection of thermal events

 

View Image - Localised thermal analysis of individual phases in a polymer-resin composite material

 

 

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