THERMOANALYTICAL STUDIES ON NEW POLYMORPHIC FORMS OF PROPYL, OCTYL AND DODECYL GALLATES

Autor(es)

de Jesus, Jany H. F. ^[1] ; Cavalheiro, Eder T. G. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, Ave Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Thermochimica Acta; v. 707, JAN 2022.
• Citações Web of Science: 0

Resumo

The thermal behavior of propyl (PG), octyl (OG) and dodecyl (DG) gallates, three antioxidants widely used in fuel and food industries, was evaluated by thermoanalytical techniques (TG, DTA, DSC and hot stage microscopy), and complementary techniques, such as FTIR-ATR and XRD. All of them presented melting in characteristic temperatures during heating. The resulting liquid phases crystallized in different solid forms when cooled just after melting. However, when the samples were heated beyond melting temperature, they decomposed. Although thermal studies were conducted at higher temperature than those in which they are regularly used, this work provided relevant information regarding their thermal behavior at higher temperatures. Data from XRD, FTIR-ATR and hot stage microscopy were used to confirm the presence of new polymorphs. Finally, based on these results mechanisms describing the thermal behavior of PG, OG and DG were proposed. (AU)

• Processo FAPESP: 15/09299-4 - Análise térmica aplicada a fármacos: antidepressivos
• Beneficiário: Éder Tadeu Gomes Cavalheiro
• Modalidade de apoio: Auxílio à Pesquisa - Regular
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• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários