A comparative test of differential scanning calorimeters |
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| Authors: | P. J. van Ekeren C. M. Holl A. J. Witteveen |
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| Affiliation: | (1) Dutch Society for Thermal Analysis TAWN, Utrecht University, Padualaan 8, NL-3584 CH Utrecht;(2) Thermodynamic Center, Dept. of Interfaces and Thermodynamics, Utrecht University, Padualaan 8, NL-3584 CH Utrecht;(3) Dept. RGL, Akzo Nobel Central Research, P. O. Box 9300, NL-6800 SB Arnhem, The Netherlands |
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| Abstract: | The Dutch Society for Thermal Analysis has developed tests to measure the resolution and the sensitivity of Differential Scanning Calorimeters. For this test the substance 4,4 -azoxyanisole is used. This substance shows two transitions: a solid to liquid crystal transition at about 117°C ( H 120 J g–1) and a liquid crystal to isotropic liquid transition at about 134°C (H2 J g–1). The resolution test is performed using an amount of 5 mg substance and a high heating rate of 20°C min–1. The resolution is evaluated by measuring how well the two peaks are separated. An amount of 0.25 mg substance and a low heating rate of 0.1 °C min–1 is used for the sensitivity test. The sensitivity is evaluated as the ratio of the peak height of the LC-transition and the top-top noise level.Members of the TAWN were asked to participate in the test. Each participant was provided with an amount of sample and a test procedure. 47 Contributions were received and these results are presented.All members of the TAWN who participated in the tests are thanked for their contributions. |
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| Keywords: | DSC resolution sensitivity test |
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