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The latest TMA 450 RH is an autonomous instrument that enables controlled relative humidity experiments over both wide temperature and RH ranges. Users can quantify CTE and CHE, track Tg changes and execute dynamic experiments, all under a controlled RH environment.
The TMA 450 RH sample chamber has been developed with an accurately positioned humidity and temperature sensor to offer the best control of the temperature and humidity environment of the sample.
The advanced software package of the TA Instruments makes use of state-of-the-art technology for instrument control, data collection and data analysis for thermal analysis and rheology. The intuitive user interface enables users to simply and effectively program experiments, and shift easily between processing experiments and viewing and analyzing data.
The expansion or swelling of a material due to water uptake relies on the material’s coefficient of hygroscopicity (CHE). The plot to the right in the figure below measures this property for Kapton, an important polyimide used in the electronics industry. The plot is a sorption isotherm produced from a stepped humidity experiment. Also shown is the calculated CHE between successive points.
Perflurosulfonic Acid (PFSA) films, also called proton exchange membranes, are utilized broadly in new battery technology. Several advanced polymers should be tested for responses to humid conditions. The plot at the right in the figure below compares the hygroscopicity of commercial film against the Kapton data above. The PFSA film has roughly an order of magnitude larger response to humidity compared to the Kapton.
Glass transitions are sensitive to water uptake, as the water serves as a plasticizer. Detecting and tracking changes in Tg are crucial to material function and storage. The plot to the right in the figure below illustrates the Tg of gelatin that has been utilized in pharmaceutical drug capsules captured with a RH ramp of 2% per minute at 37 °C and 50 °C. At higher temperatures, the Tg is moved to lower RH levels as a result of the higher water uptake and consequent plasticization.
Several materials shrink when dried, and it is essential to be able to comprehend the forces involved. In the plot on the right, a polymer film is retained under isostrain conditions of 0.2%, and the force necessary to retain this strain is tracked during a quick change in humidity ranging from 50% to 0%. The increase in force necessary to sustain the strain constant is quantified clearly.
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