傅里叶变换红外光谱
熔化温度
热分析
热的
差示扫描量热法
材料科学
熔点
化学工程
化学
分析化学(期刊)
热力学
有机化学
复合材料
物理
工程类
作者
J.H.F. de Jesus,Éder Tadeu Gomes Cavalheiro
标识
DOI:10.1016/j.tca.2021.179114
摘要
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.
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