Characterization and Thermal Stability of Polymorphic Forms of Synthesized Tristearin

摘要

The polymorphic characteristics and thermal stability of α, β', and (3 forms of synthesized tristearin were studied using X-ray diffractometry (XRD), differential scanning calorimetry (DSC), polarized light microscopy (PLM), and scanning electron microscopy (SEM). Polymorphic forms of α, β', and β were induced from tristearin melts with increasing temperatures and times. Solid-solid and melt-mediated polymorphic transitions of tristearin occurred predominantly during slow heating rates and rapid heating rates in the DSC, respectively. The stability of α and β' forms of tristearin were dependent on storage temperatures. As storage temperatures increased, the rate of polymorphic transitions from α to β and β' to β forms of tristearin increased.