Thermal and stability study of tetracene using differential scanning calorimetry |
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Authors: | George Norwitz Martin E Everett Michael T Gurbarg |
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Institution: | Frankford Arsenal, Philadelphia, Pa. 19137 U.S.A. |
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Abstract: | A thermal analysis study was made of tetracene using differential scanning calorimetry (DSC). The effect of different scan speeds was investigated. At scan speeds of 0.625 to 10°C min?1 two large rounded exothermic peaks were produced. The peaks occurred at an increasingly high temperature as the scan speed increased (for example, the peaks occurred at 128 and 130°C at a scan speed of 0.625°C min?1 and at 148 and 150°C at a scan speed of 10°C min?1. When tetracene was heated at a scan speed of 80°C min?1 only one large sharp exothermic peak was produced. It is believed that the two peaks obtained at scan speeds of 0.625 to 10°C min?1 represent decomposition of the tetracene in two successive stages, while the one peak obtained at 80°C min?1 represents an explosion. A stability test for tetracene is proposed that involves heating of the tetracene in aluminum pans from the DSC apparatus in ovens at 100, 75, and 60°C, removing the pans and samples at intervals of 30 min, 24 h, and 7 days, respectively, subjecting the samples to DSC at 1.25°C min?1, and noting the time interval in the oven that produces a DSC curve that shows obliteration of the second peak. Two lots of tetracene made by different processes showed marked differences in stability characteristics. |
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