Analysis of Polymorphism | Investigating Polymorphism (Thermal Analysis)
Polymorphism can be easily measured by DSC.
A sulfathiazole sample was measured using a Thermal Analyzer.
Fig. 1 exhibits endothermic peaks at 168.3 ºC and 202.2 ºC. However, in Fig. 2, the peak at 168.3 ºC is missing for the sulfathiazole sample that was heated to 185 ºC.
The 168.3 ºC peak suggests the existence of an unstable crystalline form.
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