Artículos de revistas
Polymorphism in propyl gallate recrystallized with acetone
Fecha
2017-04-01Registro en:
Journal of Thermal Analysis and Calorimetry, v. 128, n. 1, p. 611-614, 2017.
1588-2926
1388-6150
10.1007/s10973-016-5927-3
2-s2.0-84992740827
2-s2.0-84992740827.pdf
Autor
Universidade Estadual Paulista (Unesp)
Universidade Estadual de Campinas (UNICAMP)
UNIP – Univ Paulista
Institución
Resumen
A new polymorphic form of the synthetic antioxidant propyl gallate was obtained by the recrystallization of the compound in acetone. The new form was characterized by thermogravimetry, differential scanning calorimetry, X-ray powder diffractometry, and near- and middle-infrared region spectroscopy. While the commercial form of propyl gallate starts to melt at 145 °C with the maximum temperature of the peak at 150 °C, the recrystallized form starts to melt at 140 °C with the maximum temperature of the peak at 148.8 °C. The two forms differ much in the X-ray powder diffractograms pattern, confirming the change in the long-distance interactions in both forms but the near- and middle-infrared region spectroscopy shows that no difference occurs in the inter- and intramolecular interactions.