Abstract
When DSC is used in the isothermal mode to monitor exothermic reactions a horizontal baseline is usually assumed. The true non-linear baseline can be obtained from a second run on the fully reacted sample. This method was evaluated using the reaction of phenylglycidyl ether and 2-ethyl-4-methylimidazole in a 2:1 molar ratio. The assumption of horizontal baselines gives an apparently decreasing heat of reaction over the temperature range 80–151°C, while the use of experimentally determined non-linear baselines gives a constant heat of reaction, 459.7 J g −1 with standard deviation 17.3 J g −1.
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